Four phenoxysilicon networks for nonlinear optical (NLO) applications were designed and prepared by an extended sol-gel process without additional H2O and catalyst. All poled polymer network films possess high second-...Four phenoxysilicon networks for nonlinear optical (NLO) applications were designed and prepared by an extended sol-gel process without additional H2O and catalyst. All poled polymer network films possess high second-order nonlinear optical coefficients (d(33)) Of 10(-7)similar to 10(-8) esu. The investigation of NLO temporal stability at room temperature and elevated temperature (120 degreesC) indicated that these films exhibit high d(33) stability because the orientation of the chromophores are locked in the phenoxysilicon organic/inorganic networks.展开更多
The influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system is investigated theoretically and experimentally.In the theoretical work,a new theoretical algori...The influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system is investigated theoretically and experimentally.In the theoretical work,a new theoretical algorithm is presented for the coherent combining efficiency,which can be used to quantify the spectral coherence decay induced by optical nonlinearity imbalance between the sub-beams.The spectral information of the sub-beam is obtained by numerically solving the nonlinear Schrödinger equation(NLSE)in this algorithm to ensure an accurate prediction.In the experimental work,the coherent combining of two all-fiber picosecond lasers is achieved,and the influence of imbalanced optical nonlinearity on the combining efficiency is studied,which agrees with the theoretical prediction.This paper reveals the physical mechanism for the influence of optical nonlinearity on the combining efficiency,which is valuable for the coherent combining of ultrashort pulse fiber laser beams.展开更多
The third-order optical nonlinearity of two sandwich-type phthalocyaninato and porphyrinato europium com- plexes, including double- and triple-deckers （Eu[Pc（OC5H11）8]2, Eu2（Pc）（TPP）2, Pc=phthalocyanine, TPP=5,...The third-order optical nonlinearity of two sandwich-type phthalocyaninato and porphyrinato europium com- plexes, including double- and triple-deckers （Eu[Pc（OC5H11）8]2, Eu2（Pc）（TPP）2, Pc=phthalocyanine, TPP=5, 10, 15, 20- tetraphenylporphyrinate）, was investigated by using the femtosecond time-resolved optical Kerr gate method at 830 nm wavelength. Their second-order hyperpolarizability is estimated to be 0.74× 10^-30esu and 3.0× 10^-3esu respectively. This exhibits an evident enhancement in comparison with 0.47×10^-30esu for one-decker Eu（Pc）（acac） （acac=acetylacetonate）, which is also measured under the same conditions. The enhancement is attributed to the introduction of lanthanide metal to the large π-conjugated system, intermacrocycle interaction and two-photon resonance etc.展开更多
Ultrafine PbS particles with different sizes have been prepared in perfluorocarboxylated cation-exchanged films. The variation of PbS particle size was clarified by absorption spectra and TEM graphs. Time-resolved opt...Ultrafine PbS particles with different sizes have been prepared in perfluorocarboxylated cation-exchanged films. The variation of PbS particle size was clarified by absorption spectra and TEM graphs. Time-resolved optical Kerr effects were measured by femtosecond pump-probe techniques. Optical Kerr effect response time was estimated to be less than 165 fs. A third-order optical nonlinearity of χ(3)10-12 esu for PbS particles was obtained and it was found that it increases with the decrease of particle sizes, showing the influence of quantum confined effect on optical nonlinear behaviour of ultrafine particles.展开更多
The transmittance technique with a phase object（T-PO）,for measuring optical nonlinear coefficients is proposed with a top-hat beam.The sensitivity of the T-PO with a top-hat beam is a factor of 4 greater than that w...The transmittance technique with a phase object（T-PO）,for measuring optical nonlinear coefficients is proposed with a top-hat beam.The sensitivity of the T-PO with a top-hat beam is a factor of 4 greater than that with a Gaussian beam.The validity of this method is verified by measuring the nonlinearity of a well-characterized liquid,CS 2 at 532-nm wavelength.The ease of use of this method has been proved by measuring a new compound 4-（N-methyl,N-hydroxyethyl）amino,4＇-nitroazobenzene（ANAB） at 600-nm wavelength,indicating that this method can be extended to the measurement of optical nonlinearities in a wide-band spectrum.展开更多
Stable porphyrin-oxygenated carbon nanomaterial dispersions were prepared by blending porphyrin solutions with hydroxyl groups modified multi-walled carbon nanotubes(MWNTs-OH)and graphene oxide(GO)dispersions,respecti...Stable porphyrin-oxygenated carbon nanomaterial dispersions were prepared by blending porphyrin solutions with hydroxyl groups modified multi-walled carbon nanotubes(MWNTs-OH)and graphene oxide(GO)dispersions,respectively.Optical nonlinearity and optical limiting(OL)property of these blends are investigated in nanosecond regime.Results show that the OL performance of the blends can be tuned by changing the concentrations ratio of porphyrin and oxygenated carbon nanomaterials.The high concentration of oxygenated carbon nanomaterial leads to the poor OL performance.However,with the moderate concentration,the blends exhibit the low threshold value of OL and the enhanced OL performance at high fluence region.The superior OL performance can be attributed to complementary mechanisms and possible photoinduced electron or energy transfer between porphyrin moiety and oxygenated carbon nanomaterials.展开更多
Chalcogenide glasses （ChGs） are a promising candidate for applications in nonlinear photonic devices. In this paper, we review the research progress of the third-order optical nonlinearity （TONL） of ChGs from the ...Chalcogenide glasses （ChGs） are a promising candidate for applications in nonlinear photonic devices. In this paper, we review the research progress of the third-order optical nonlinearity （TONL） of ChGs from the following three aspects： chemical composition, excitation condition, and post processing. The deficiencies in previous studies and further research of the TONL property of ChGs are also discussed.展开更多
We present a detailed calculation of the linear and nonlinear optical response of four types of monolayer twodimensional (2D) transition-metal dichalcogenides (TMDCs), having the formula MX2 with M=Mo, W and X=S, Se.T...We present a detailed calculation of the linear and nonlinear optical response of four types of monolayer twodimensional (2D) transition-metal dichalcogenides (TMDCs), having the formula MX2 with M=Mo, W and X=S, Se.The calculations are based on 6-band tight-binding model of TMDCs, and then performing a semi-classical perturbation analysis of response functions. We numerically calculate the linearχ(1)μν(-ω;ω) and nonlinear surface susceptibility tensorsχ(3)μνζη(-ωΣ;ωr,ωs,ωt) withωΣ=ωr+ωs+ωt. Both non-degenerate and degenerate cases are studied for thirdharmonic generation and nonlinear refractive index, respectively. Computational results obtained with no external fitting parameters are discussed regarding two recent reported experiments on Mo S2, and thus we can confirm the extraordinarily strong optical nonlinearity of TMDCs. As a possible application, we demonstrate generation of aπ/4-rotated squeezed state by means of nonlinear response of TMDCs, in a silica micro-disk resonator covered with the 2D material. Our proposed method will enable accurate calculations of nonlinear optical response, such as four-wave mixing and highharmonic generation in 2D materials and their heterostructures, thus enabling study of novel functionalities of 2D photonic integrated circuits.展开更多
We propose a novel optical signal regeneration system based on wavelength converters by use of cross gain modulation in cascaded semiconductor optical amplifiers. The nonlinearity in optical input/output characteristi...We propose a novel optical signal regeneration system based on wavelength converters by use of cross gain modulation in cascaded semiconductor optical amplifiers. The nonlinearity in optical input/output characteristics and eye opening using NRZ signal were archived.展开更多
Optical dispersive nonlinearities in Er-doped optical fiber are discussed and measured at the third window wavelength 1.55 μm for optical communications firstly. The experimental method, which is developed by us, is ...Optical dispersive nonlinearities in Er-doped optical fiber are discussed and measured at the third window wavelength 1.55 μm for optical communications firstly. The experimental method, which is developed by us, is based on dynamic scanning for fixed-point-interference (DSFPI) of two fiber beams. The real part and complex value of the third-order susceptibility at the wavelength are also obtained from the measured Kerr coefficient and nonlinear-absorption coefficient reported elsewhere.展开更多
Stainless steel-doped SrTiO3 thin films were fabricated by laser molecular beam epitaxy (L-MBE). Nonlinear optical property of the thin film was measured by the single beam Z-scan technique at the wavelength of 532 nm...Stainless steel-doped SrTiO3 thin films were fabricated by laser molecular beam epitaxy (L-MBE). Nonlinear optical property of the thin film was measured by the single beam Z-scan technique at the wavelength of 532 nm. Two two-phonon absorption coefficient and nonlinear refractive index were determined to be 9.37 x 10-7 m/W and 1.55 x 10-6 esu, respectively. The merit figure T was calculated to be 1.8, satisfying condition T < 1 for an optical switch. The thin film has a very promising prospect for the applications in optical device.展开更多
Optical absorptive nonlinearity in Er doped optical fiber has been discussed and measured at the window wavelength 1.55 μm for optical communications firstly. It is proposed that the mechanism of this absorptive...Optical absorptive nonlinearity in Er doped optical fiber has been discussed and measured at the window wavelength 1.55 μm for optical communications firstly. It is proposed that the mechanism of this absorptive nonlinearity is the induced absorption. The first order nonlinear absorptive coefficient and the imaginary part and the complex value of the third order susceptibility at that wavelength are obtained from the measured absorptive nonlinearity.展开更多
Perovskite nanocrystals （NCs） have strong nonlinear optical responses with a number of potential applications, ranging from upconverted blue-lasing to the tagging of specific cellular components in multicolor fluore...Perovskite nanocrystals （NCs） have strong nonlinear optical responses with a number of potential applications, ranging from upconverted blue-lasing to the tagging of specific cellular components in multicolor fluorescence microscopy. Here, we determine the one-photon linear absorption cross section of two kinds of blue-emitting perovskite NCs, i.e., CsPbCl3 and CsPb（C10.53Br0.47）3, by utilizing femtosecond transient absorption spectroscopy. The wavelength-dependent nonlinear refraction and two-photon absorption have been measured at wavelengths from 620 to 720 nm by performing Z-scan measurements. The nonlinear optical responses of CsPb（C10.53Br0.47）3 are much more pronounced than those of CsPbCl3 due to the larger structural destahilization of the former.展开更多
Utilizing the linear-stability analysis, this paper analytically investigates and calculates the condition and gain spectra of cross-phase modulation instability in optical fibres in the ease of exponential saturable ...Utilizing the linear-stability analysis, this paper analytically investigates and calculates the condition and gain spectra of cross-phase modulation instability in optical fibres in the ease of exponential saturable nonlinearity and high-order dispersion. The results show that, the modulation instability characteristics here are similar to those of conventional saturable nonlinearity and Kerr nonlinearity. That is to say, when the fourth-order dispersion has the same sign as that of the second-order one, a new gain spectral region called the second one which is far away from the zero point may appear. The existence of the exponential saturable nonlinearity will make the spectral width as well as the peak gain of every spectral region increase with the input powers before decrease. Namely, for every spectral regime, this may lead to a unique value of peak gain and spectral width for two different input powers. In comparison with the case of conventional saturable nonlinearity, however, when the other parameters are the same, the variations of the spectral width and the peak gain with the input powers will be faster in case of exponential saturable nonlinearity.展开更多
In this study,the first methyl sulfonate deepultraviolet(DUV)nonlinear optical(NLO)crystal,Ba(SO_(3)CH_(3))_(2),was successfully synthesized with the polar non-π-conjugated tetrahedron,SO_(3)CH_(3)^(−),as a novel DUV...In this study,the first methyl sulfonate deepultraviolet(DUV)nonlinear optical(NLO)crystal,Ba(SO_(3)CH_(3))_(2),was successfully synthesized with the polar non-π-conjugated tetrahedron,SO_(3)CH_(3)^(−),as a novel DUV NLO building unit.Results showed that Ba(SO_(3)CH_(3))_(2)not only had a very short absorption edge of 159 nm,which is the shortest among reported phase-matchable sulfates or sulfonates,but also exhibited excellent optical properties.(Powder X-ray diffractionwas ca.1.5×KH_(2)PO_(4)and birefringence was 0.04 at 589.3 nm.)It also exhibited high thermal stability and remarkable stability against air and moisture.Additionally,bulk Ba(SO_(3)CH_(3))_(2)crystal could be obtained conveniently from a simple solution evaporation process.Therefore,Ba(SO_(3)CH_(3))_(2)should have great potential as a DUV NLO crystal in the near future.展开更多
Large nonlinear optical(NLO) coefficient and good stability, two essential factors to evaluate second-order NLO materials, are difficult to be achieved in one molecule simultaneously. Herein, by utilizing the concept ...Large nonlinear optical(NLO) coefficient and good stability, two essential factors to evaluate second-order NLO materials, are difficult to be achieved in one molecule simultaneously. Herein, by utilizing the concept of "isolation chromophore", "isolation group" and dendritic structure, a dendritic molecule D-NS and a dendronized hyperbranched polymer DHP-NS are prepared to investigate their structure-property relationship. For the small dendritic molecule D-NS, it exhibits a high d33 value of 140 pm/V.But this value can be easily dropped when the temperature is higher than 50 °C, which extremely limits its real application. After introducing D-NS into a dendronized hyperbranched polymer chains, the obtained DHP-NS also shows a high d33 value of101 pm/V, but much better stability than D-NS. Even when its thin film was heated to 120 °C, no obvious decay can be observed in the d33 value of DHP-NS. This work demonstrates an effective strategy to realize both large NLO effect and good stability simultaneously.展开更多
Herein,we report the synthesis and third-order nonlinear optical(NLO)properties of a novel cage-based 2D metal-organic framework constructed from Ti_(4)L_(6)(L4-=embonate)cage combined with Mg^(2+)and tris[4-(1H-imida...Herein,we report the synthesis and third-order nonlinear optical(NLO)properties of a novel cage-based 2D metal-organic framework constructed from Ti_(4)L_(6)(L4-=embonate)cage combined with Mg^(2+)and tris[4-(1H-imidazol-1-yl)phenyl]amine(tipa)ligand,whose molecular formula is(Me_(2)CH_(2))_(2)[Mg_(3)(Ti_(4)L_(6))(tipa)(H_(2)O)_(12)](PTC‑378).The Ti_(4)L_(6)tetrahedral cages serve as robust building units,while the Mg^(2+)ions and tipa ligands provide structural stability and tunable optical properties.The resulting PTC‑378 film exhibited intriguing third-order NLO property,which was systematically investigated using Z-scan techniques.Our results demonstrate that the synergistic interaction between Ti_(4)L_(6)cages andπ-conjugated ligands significantly enhances the NLO performance of the materials.CCDC:2453909.展开更多
Sulfates are always promising short-wave ultraviolet(UV)nonlinear optical(NLO)candidates,if their birefringence could be greatly improved.Here,in terms of the insufficient birefringence,the unity of heteroleptic tetra...Sulfates are always promising short-wave ultraviolet(UV)nonlinear optical(NLO)candidates,if their birefringence could be greatly improved.Here,in terms of the insufficient birefringence,the unity of heteroleptic tetrahedral groups and triangular ones was proposed and implemented.Thus,a new semiorganic crystal,[C(NH_(2))_(3)]S_(3)O_(6)(G_(2)S_(3)O_(6)),was obtained,which is composed of[S_(3)O_(6)]^(2-)and[C(NH_(2))_(3)]+groups.It exhibits excellent optical properties with a short absorption cutoff edge of 218 nm,a strong NLO response of 1.4×KH_(2)PO_(4),and more especially,a large birefringence of 0.097@546 nm.This birefringence leap makes the G_(2)S_(3)O_(6) crystal achieve a phase-matching behavior under a 532 nm laser.Thus,the synergy of[S_(3)O_(6)]^(2-)and[C(NH_(2))_(3)]~+groups results in excellent optical performances.This finding opens a new horizon for exploring novel UV NLO crystals.展开更多
Short-wavelength nonlinear optical(NLO)crystals can convert a specific wavelength of light to ultraviolet(UV)and deep-UV region.To date,most of the commercialized UV and deep-UV NLO materials are borate crystals.By co...Short-wavelength nonlinear optical(NLO)crystals can convert a specific wavelength of light to ultraviolet(UV)and deep-UV region.To date,most of the commercialized UV and deep-UV NLO materials are borate crystals.By combining the merits of borates and silicates,borosilicates exhibit some unique advantages of rich structural types,moderate second harmonic generation(SHG)response,and high UV transmittance.This paper summarizes the known NLO borosilicates which can be grouped into two types according to the linkage modes of BO and SiO units:(1)borosilicates with BOSi covalent bond,and(2)borosilicates with isolated BO and SiO units.The structural features,SHG intensities,and UV cutoff edges of these borosilicates are discussed.Finally,future perspectives in this field are presented.展开更多
It remains highly challenging to achieve the high-order nonlinear optical(NLO)properties of atomically precise metal nanoclusters via template-maintained manipulation.Here,based on the M_(1)Ag_(24)(SR)_(18)(M=Ag/Au/Pt...It remains highly challenging to achieve the high-order nonlinear optical(NLO)properties of atomically precise metal nanoclusters via template-maintained manipulation.Here,based on the M_(1)Ag_(24)(SR)_(18)(M=Ag/Au/Pt/Pd;SR=2,4-dimethylthiophenol)cluster template,we demonstrated that the innermost kernel alloying rendered these nanoclusters highly controllable towards the nonlinear optics.The Pd-alloyed Pd_(1)Ag_(24)(SR)_(18) only dis-played single-photon-excited fluorescence,while the homo-silver Ag_(25)(SR)_(18) nanocluster generated the two-photonexcited fluorescence characterization.The Au-and Pt-doped M_(1)Ag_(24)(SR)_(18) nanoclusters showed high-order three-and four-photon-excited fluorescence,respectively,demonstrating that the order-by-order control over the nonlinear optics of nanoclusters has been accomplished.Moreover,Pd_(1)Ag_(24)(SR)_(18) with high-order NLO characterization exhibited the best optical limiting performance under 1000 nm excitation,in agreement with its most prominent NLO property.Overall,this work presents an intriguing cluster template that enables successive order control over the nonlinear optics of atomically precise metal nanoclusters,hopefully paving the way for developing cluster-based nanomaterials with customized optical characterizations.展开更多
文摘Four phenoxysilicon networks for nonlinear optical (NLO) applications were designed and prepared by an extended sol-gel process without additional H2O and catalyst. All poled polymer network films possess high second-order nonlinear optical coefficients (d(33)) Of 10(-7)similar to 10(-8) esu. The investigation of NLO temporal stability at room temperature and elevated temperature (120 degreesC) indicated that these films exhibit high d(33) stability because the orientation of the chromophores are locked in the phenoxysilicon organic/inorganic networks.
基金upported by the Key Program of Beijing Municipal Natural Science Foundation,China(Grant No.KZ201910005006)the National Natural Science Foundation of China(Grant No.62005004)+1 种基金Natural Science Foundation of Beijing Municipality,China(Grant No.4204091)National Science Foundation for Post-doctor Scientists of China(Grant No.212423)。
文摘The influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system is investigated theoretically and experimentally.In the theoretical work,a new theoretical algorithm is presented for the coherent combining efficiency,which can be used to quantify the spectral coherence decay induced by optical nonlinearity imbalance between the sub-beams.The spectral information of the sub-beam is obtained by numerically solving the nonlinear Schrödinger equation(NLSE)in this algorithm to ensure an accurate prediction.In the experimental work,the coherent combining of two all-fiber picosecond lasers is achieved,and the influence of imbalanced optical nonlinearity on the combining efficiency is studied,which agrees with the theoretical prediction.This paper reveals the physical mechanism for the influence of optical nonlinearity on the combining efficiency,which is valuable for the coherent combining of ultrashort pulse fiber laser beams.
基金Project supported by the National Key Research Program of China （Grant No TG1999075209） and the National Natural Science Foundation of China （Grant Nos 10434020, 90206003 and 60378012）.
文摘The third-order optical nonlinearity of two sandwich-type phthalocyaninato and porphyrinato europium com- plexes, including double- and triple-deckers （Eu[Pc（OC5H11）8]2, Eu2（Pc）（TPP）2, Pc=phthalocyanine, TPP=5, 10, 15, 20- tetraphenylporphyrinate）, was investigated by using the femtosecond time-resolved optical Kerr gate method at 830 nm wavelength. Their second-order hyperpolarizability is estimated to be 0.74× 10^-30esu and 3.0× 10^-3esu respectively. This exhibits an evident enhancement in comparison with 0.47×10^-30esu for one-decker Eu（Pc）（acac） （acac=acetylacetonate）, which is also measured under the same conditions. The enhancement is attributed to the introduction of lanthanide metal to the large π-conjugated system, intermacrocycle interaction and two-photon resonance etc.
基金the High Technology Research and Development Programme of China and Academia Sinica.
文摘Ultrafine PbS particles with different sizes have been prepared in perfluorocarboxylated cation-exchanged films. The variation of PbS particle size was clarified by absorption spectra and TEM graphs. Time-resolved optical Kerr effects were measured by femtosecond pump-probe techniques. Optical Kerr effect response time was estimated to be less than 165 fs. A third-order optical nonlinearity of χ(3)10-12 esu for PbS particles was obtained and it was found that it increases with the decrease of particle sizes, showing the influence of quantum confined effect on optical nonlinear behaviour of ultrafine particles.
文摘The transmittance technique with a phase object（T-PO）,for measuring optical nonlinear coefficients is proposed with a top-hat beam.The sensitivity of the T-PO with a top-hat beam is a factor of 4 greater than that with a Gaussian beam.The validity of this method is verified by measuring the nonlinearity of a well-characterized liquid,CS 2 at 532-nm wavelength.The ease of use of this method has been proved by measuring a new compound 4-（N-methyl,N-hydroxyethyl）amino,4＇-nitroazobenzene（ANAB） at 600-nm wavelength,indicating that this method can be extended to the measurement of optical nonlinearities in a wide-band spectrum.
基金supported by the National Natural Science Foundation of China(No.61174010)the Shanxi International Cooperation Project(No.2012081043)+1 种基金the Shanxi Scholarship Council(No.2013-038)the Scientific Research Starting Foundation from Taiyuan University of Technology(No.tyut-rc201162a)
文摘Stable porphyrin-oxygenated carbon nanomaterial dispersions were prepared by blending porphyrin solutions with hydroxyl groups modified multi-walled carbon nanotubes(MWNTs-OH)and graphene oxide(GO)dispersions,respectively.Optical nonlinearity and optical limiting(OL)property of these blends are investigated in nanosecond regime.Results show that the OL performance of the blends can be tuned by changing the concentrations ratio of porphyrin and oxygenated carbon nanomaterials.The high concentration of oxygenated carbon nanomaterial leads to the poor OL performance.However,with the moderate concentration,the blends exhibit the low threshold value of OL and the enhanced OL performance at high fluence region.The superior OL performance can be attributed to complementary mechanisms and possible photoinduced electron or energy transfer between porphyrin moiety and oxygenated carbon nanomaterials.
基金Project supported by the National Natural Science Foundation of China(Grant No.61675106)the National Key Research and Development Program of China(Grant No.2016YFB0303803)the K C Wong Magna Fund in Ningbo University
文摘Chalcogenide glasses （ChGs） are a promising candidate for applications in nonlinear photonic devices. In this paper, we review the research progress of the third-order optical nonlinearity （TONL） of ChGs from the following three aspects： chemical composition, excitation condition, and post processing. The deficiencies in previous studies and further research of the TONL property of ChGs are also discussed.
基金Supported in part by Laboratory of Photonics and Quantum Measurements(LPQM)at EPFL and European Graphene Flagship under Grant No.696656Research Deputy of Sharif University of Technology
文摘We present a detailed calculation of the linear and nonlinear optical response of four types of monolayer twodimensional (2D) transition-metal dichalcogenides (TMDCs), having the formula MX2 with M=Mo, W and X=S, Se.The calculations are based on 6-band tight-binding model of TMDCs, and then performing a semi-classical perturbation analysis of response functions. We numerically calculate the linearχ(1)μν(-ω;ω) and nonlinear surface susceptibility tensorsχ(3)μνζη(-ωΣ;ωr,ωs,ωt) withωΣ=ωr+ωs+ωt. Both non-degenerate and degenerate cases are studied for thirdharmonic generation and nonlinear refractive index, respectively. Computational results obtained with no external fitting parameters are discussed regarding two recent reported experiments on Mo S2, and thus we can confirm the extraordinarily strong optical nonlinearity of TMDCs. As a possible application, we demonstrate generation of aπ/4-rotated squeezed state by means of nonlinear response of TMDCs, in a silica micro-disk resonator covered with the 2D material. Our proposed method will enable accurate calculations of nonlinear optical response, such as four-wave mixing and highharmonic generation in 2D materials and their heterostructures, thus enabling study of novel functionalities of 2D photonic integrated circuits.
文摘We propose a novel optical signal regeneration system based on wavelength converters by use of cross gain modulation in cascaded semiconductor optical amplifiers. The nonlinearity in optical input/output characteristics and eye opening using NRZ signal were archived.
文摘Optical dispersive nonlinearities in Er-doped optical fiber are discussed and measured at the third window wavelength 1.55 μm for optical communications firstly. The experimental method, which is developed by us, is based on dynamic scanning for fixed-point-interference (DSFPI) of two fiber beams. The real part and complex value of the third-order susceptibility at the wavelength are also obtained from the measured Kerr coefficient and nonlinear-absorption coefficient reported elsewhere.
基金This work was supported by the National Natural Science Foundation under Grant No. 5001161952.
文摘Stainless steel-doped SrTiO3 thin films were fabricated by laser molecular beam epitaxy (L-MBE). Nonlinear optical property of the thin film was measured by the single beam Z-scan technique at the wavelength of 532 nm. Two two-phonon absorption coefficient and nonlinear refractive index were determined to be 9.37 x 10-7 m/W and 1.55 x 10-6 esu, respectively. The merit figure T was calculated to be 1.8, satisfying condition T < 1 for an optical switch. The thin film has a very promising prospect for the applications in optical device.
文摘Optical absorptive nonlinearity in Er doped optical fiber has been discussed and measured at the window wavelength 1.55 μm for optical communications firstly. It is proposed that the mechanism of this absorptive nonlinearity is the induced absorption. The first order nonlinear absorptive coefficient and the imaginary part and the complex value of the third order susceptibility at that wavelength are obtained from the measured absorptive nonlinearity.
基金Shenzhen Basic Research Project of Science and Technology(JCYJ2015032414171163,JCYJ20170302142433007)National Natural Science Foundation of China(NSFC)(11404092,11404219,11574130)
文摘Perovskite nanocrystals （NCs） have strong nonlinear optical responses with a number of potential applications, ranging from upconverted blue-lasing to the tagging of specific cellular components in multicolor fluorescence microscopy. Here, we determine the one-photon linear absorption cross section of two kinds of blue-emitting perovskite NCs, i.e., CsPbCl3 and CsPb（C10.53Br0.47）3, by utilizing femtosecond transient absorption spectroscopy. The wavelength-dependent nonlinear refraction and two-photon absorption have been measured at wavelengths from 620 to 720 nm by performing Z-scan measurements. The nonlinear optical responses of CsPb（C10.53Br0.47）3 are much more pronounced than those of CsPbCl3 due to the larger structural destahilization of the former.
基金Project supported by the Key Program of the Natural Science Foundation of Sichuan Provincial Education Department (Grant No. 2006A124)the Fundamental Application Research Project of the Department of Science & Technology of Sichuan Province (Grant No. 05JY029-084)
文摘Utilizing the linear-stability analysis, this paper analytically investigates and calculates the condition and gain spectra of cross-phase modulation instability in optical fibres in the ease of exponential saturable nonlinearity and high-order dispersion. The results show that, the modulation instability characteristics here are similar to those of conventional saturable nonlinearity and Kerr nonlinearity. That is to say, when the fourth-order dispersion has the same sign as that of the second-order one, a new gain spectral region called the second one which is far away from the zero point may appear. The existence of the exponential saturable nonlinearity will make the spectral width as well as the peak gain of every spectral region increase with the input powers before decrease. Namely, for every spectral regime, this may lead to a unique value of peak gain and spectral width for two different input powers. In comparison with the case of conventional saturable nonlinearity, however, when the other parameters are the same, the variations of the spectral width and the peak gain with the input powers will be faster in case of exponential saturable nonlinearity.
基金supported by the National Natural Science Foundation of China(grant nos.22222510,21975255,21921001)the Foundation of Fujian Science&Technology Innovation Laboratory(grant no.2021ZR202)the Youth Innovation Promotion Association CAS(grant no.2019303).
文摘In this study,the first methyl sulfonate deepultraviolet(DUV)nonlinear optical(NLO)crystal,Ba(SO_(3)CH_(3))_(2),was successfully synthesized with the polar non-π-conjugated tetrahedron,SO_(3)CH_(3)^(−),as a novel DUV NLO building unit.Results showed that Ba(SO_(3)CH_(3))_(2)not only had a very short absorption edge of 159 nm,which is the shortest among reported phase-matchable sulfates or sulfonates,but also exhibited excellent optical properties.(Powder X-ray diffractionwas ca.1.5×KH_(2)PO_(4)and birefringence was 0.04 at 589.3 nm.)It also exhibited high thermal stability and remarkable stability against air and moisture.Additionally,bulk Ba(SO_(3)CH_(3))_(2)crystal could be obtained conveniently from a simple solution evaporation process.Therefore,Ba(SO_(3)CH_(3))_(2)should have great potential as a DUV NLO crystal in the near future.
基金supported by the Startup Research Fund of Zhengzhou University(1411320006)the National Natural Science Foundation of China(21325416,21274133)
文摘Large nonlinear optical(NLO) coefficient and good stability, two essential factors to evaluate second-order NLO materials, are difficult to be achieved in one molecule simultaneously. Herein, by utilizing the concept of "isolation chromophore", "isolation group" and dendritic structure, a dendritic molecule D-NS and a dendronized hyperbranched polymer DHP-NS are prepared to investigate their structure-property relationship. For the small dendritic molecule D-NS, it exhibits a high d33 value of 140 pm/V.But this value can be easily dropped when the temperature is higher than 50 °C, which extremely limits its real application. After introducing D-NS into a dendronized hyperbranched polymer chains, the obtained DHP-NS also shows a high d33 value of101 pm/V, but much better stability than D-NS. Even when its thin film was heated to 120 °C, no obvious decay can be observed in the d33 value of DHP-NS. This work demonstrates an effective strategy to realize both large NLO effect and good stability simultaneously.
文摘Herein,we report the synthesis and third-order nonlinear optical(NLO)properties of a novel cage-based 2D metal-organic framework constructed from Ti_(4)L_(6)(L4-=embonate)cage combined with Mg^(2+)and tris[4-(1H-imidazol-1-yl)phenyl]amine(tipa)ligand,whose molecular formula is(Me_(2)CH_(2))_(2)[Mg_(3)(Ti_(4)L_(6))(tipa)(H_(2)O)_(12)](PTC‑378).The Ti_(4)L_(6)tetrahedral cages serve as robust building units,while the Mg^(2+)ions and tipa ligands provide structural stability and tunable optical properties.The resulting PTC‑378 film exhibited intriguing third-order NLO property,which was systematically investigated using Z-scan techniques.Our results demonstrate that the synergistic interaction between Ti_(4)L_(6)cages andπ-conjugated ligands significantly enhances the NLO performance of the materials.CCDC:2453909.
基金supported by the National Natural Science Foundation of China(Nos.52172009 and 12275274)the Science and Technology Project of Fujian Province(Nos.2021J01519 and 2021H0043)the Instrument Developing Project of Chinese Academy of Sciences(No.YJKYYQ20210033)。
文摘Sulfates are always promising short-wave ultraviolet(UV)nonlinear optical(NLO)candidates,if their birefringence could be greatly improved.Here,in terms of the insufficient birefringence,the unity of heteroleptic tetrahedral groups and triangular ones was proposed and implemented.Thus,a new semiorganic crystal,[C(NH_(2))_(3)]S_(3)O_(6)(G_(2)S_(3)O_(6)),was obtained,which is composed of[S_(3)O_(6)]^(2-)and[C(NH_(2))_(3)]+groups.It exhibits excellent optical properties with a short absorption cutoff edge of 218 nm,a strong NLO response of 1.4×KH_(2)PO_(4),and more especially,a large birefringence of 0.097@546 nm.This birefringence leap makes the G_(2)S_(3)O_(6) crystal achieve a phase-matching behavior under a 532 nm laser.Thus,the synergy of[S_(3)O_(6)]^(2-)and[C(NH_(2))_(3)]~+groups results in excellent optical performances.This finding opens a new horizon for exploring novel UV NLO crystals.
基金supported by the National Natural Science Foundation of China(No.21975224).
文摘Short-wavelength nonlinear optical(NLO)crystals can convert a specific wavelength of light to ultraviolet(UV)and deep-UV region.To date,most of the commercialized UV and deep-UV NLO materials are borate crystals.By combining the merits of borates and silicates,borosilicates exhibit some unique advantages of rich structural types,moderate second harmonic generation(SHG)response,and high UV transmittance.This paper summarizes the known NLO borosilicates which can be grouped into two types according to the linkage modes of BO and SiO units:(1)borosilicates with BOSi covalent bond,and(2)borosilicates with isolated BO and SiO units.The structural features,SHG intensities,and UV cutoff edges of these borosilicates are discussed.Finally,future perspectives in this field are presented.
基金the NSFC(U24A20480,22371003,22471001,22475002)the Ministry of Education,Natural Science Foundation of Anhui Province(2408085Y006)the Scientific Research Program of Universities in Anhui Province(2022AH030009).
文摘It remains highly challenging to achieve the high-order nonlinear optical(NLO)properties of atomically precise metal nanoclusters via template-maintained manipulation.Here,based on the M_(1)Ag_(24)(SR)_(18)(M=Ag/Au/Pt/Pd;SR=2,4-dimethylthiophenol)cluster template,we demonstrated that the innermost kernel alloying rendered these nanoclusters highly controllable towards the nonlinear optics.The Pd-alloyed Pd_(1)Ag_(24)(SR)_(18) only dis-played single-photon-excited fluorescence,while the homo-silver Ag_(25)(SR)_(18) nanocluster generated the two-photonexcited fluorescence characterization.The Au-and Pt-doped M_(1)Ag_(24)(SR)_(18) nanoclusters showed high-order three-and four-photon-excited fluorescence,respectively,demonstrating that the order-by-order control over the nonlinear optics of nanoclusters has been accomplished.Moreover,Pd_(1)Ag_(24)(SR)_(18) with high-order NLO characterization exhibited the best optical limiting performance under 1000 nm excitation,in agreement with its most prominent NLO property.Overall,this work presents an intriguing cluster template that enables successive order control over the nonlinear optics of atomically precise metal nanoclusters,hopefully paving the way for developing cluster-based nanomaterials with customized optical characterizations.
