hydroxy-4-nitro azobenzene (NHA) and 4-amino-4-nitro azobenzene (DO3) were prepared respectively from p-nitrophenylamine as a precursor compound. Two kinds of doped organic/inorganic hybrid nonlinear optical (NLO) mat...hydroxy-4-nitro azobenzene (NHA) and 4-amino-4-nitro azobenzene (DO3) were prepared respectively from p-nitrophenylamine as a precursor compound. Two kinds of doped organic/inorganic hybrid nonlinear optical (NLO) materials containing NHA and DO3 were synthesized by Sol-Gel process. The preparation and properties of two NLO materials were studied and characterized by FTIR, 1H-NMR, UV-VIS, SEM, DSC and SHG measurements. The results show that the maximum doping amounts of NHA and DO3 in two doped hybrid NLO materials are 7.2(wt)% and 11.3(wt)% respectively, and the corresponding second-order NLO coefficients (d33 values) are 2.91×10 8esu and 6.14×10 8esu. Two doped NLO materials have relatively good RT stability, after 90 days at RT the d33 values can maintain about 85% of their initial values, but after 10h at 100℃ can only maintain about 50% of their initial values. In this report, the reasons for high-temperature instability of doped materials were discussed, and the possible improvements were also suggested.展开更多
A supercontinuum white laser with ultrabroad bandwidth,intense pulse energy,and high spectral flatness can be accomplished via synergic action of third-order nonlinearity(3rd-NL)and second-order nonlinearity.In this w...A supercontinuum white laser with ultrabroad bandwidth,intense pulse energy,and high spectral flatness can be accomplished via synergic action of third-order nonlinearity(3rd-NL)and second-order nonlinearity.In this work,we employ an intense Ti:sapphire femtosecond laser with a pulse duration of 50 fs and pulse energy up to 4 mJ to ignite the supercontinuum white laser.Remarkably,we use water instead of the usual solid materials as the 3rd-NL medium exhibiting both strong self-phase modulation and stimulated Raman scattering effect to create a supercontinuum laser with significantly broadened bandwidth and avoid laser damage and destruction.Then the supercontinuum laser is injected into a water-embedded chirped periodically poled lithium niobate crystal that enables broadband and high-efficiency second-harmonic generation.The output white laser has a 10 dB bandwidth encompassing 413 to 907 nm,more than one octave,and a pulse energy of 0.6 mJ.This methodology would open up an efficient route to creating a long-lived,high-stability,and inexpensive white laser with intense pulse energy,high spectral flatness,and ultrabroad bandwidth for application to various areas of basic science and high technology.展开更多
When two synchronized laser beams illuminate the inner surface of bulk lithium niobate crystals with magnesium doping(5%/mol MgO:LiNbO_(3))under the condition of total reflection,semi-degenerate four-wave mixing(FWM)i...When two synchronized laser beams illuminate the inner surface of bulk lithium niobate crystals with magnesium doping(5%/mol MgO:LiNbO_(3))under the condition of total reflection,semi-degenerate four-wave mixing(FWM)is generated.On this basis,a more sophisticated frequency conversion process on the interface of nonlinear crystal has been researched.The generation mechanism of FWM is associated with the fundamental waves reflected on the inner surface of the nonlinear crystal.Analysis of the phase-matching mechanism confirms that the FWM is radiated by the third-order nonlinear polarized waves,which are stimulated by the third-order nonlinear susceptibility coefficient of the nonlinear crystal.Theoretically calculated and experimentally measured corresponding data have been presented in this article.These results are expected to provide new inspiration for further experimental and theoretical research on frequency conversion in nonlinear crystals.展开更多
Nonlinear optical (NLO)materials are increaingly needed along with the development ofoptoelectronic technique. In recent years there has been a growth of interest in organic materialsfor their application in the field...Nonlinear optical (NLO)materials are increaingly needed along with the development ofoptoelectronic technique. In recent years there has been a growth of interest in organic materialsfor their application in the field of nonlinear optics. This is because organic double-frequencymaterials can have much higher nonlinear optical coefficients,shorter response times and higherlaser damage thresholds than inorganic materials.展开更多
The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been ...The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been calculated. The influences of molecular structure, donor, acceptor and the frequency of external field on β and γ, and the relationship between γ and the number of thiophene rings (i. e. conjugated chain length) have been studied using INDO/SCI methods combined with sum-overstate (SOS) formula. The calculated results show that γ is proportional to 2.69 power of the chain length of the conjugated molecular bonds when the length is not quite long.展开更多
基金Plan Project of Science and Technology of Guangzhou City (2002J1-C0061) The First Author: XI Hongxia(1968-)
文摘hydroxy-4-nitro azobenzene (NHA) and 4-amino-4-nitro azobenzene (DO3) were prepared respectively from p-nitrophenylamine as a precursor compound. Two kinds of doped organic/inorganic hybrid nonlinear optical (NLO) materials containing NHA and DO3 were synthesized by Sol-Gel process. The preparation and properties of two NLO materials were studied and characterized by FTIR, 1H-NMR, UV-VIS, SEM, DSC and SHG measurements. The results show that the maximum doping amounts of NHA and DO3 in two doped hybrid NLO materials are 7.2(wt)% and 11.3(wt)% respectively, and the corresponding second-order NLO coefficients (d33 values) are 2.91×10 8esu and 6.14×10 8esu. Two doped NLO materials have relatively good RT stability, after 90 days at RT the d33 values can maintain about 85% of their initial values, but after 10h at 100℃ can only maintain about 50% of their initial values. In this report, the reasons for high-temperature instability of doped materials were discussed, and the possible improvements were also suggested.
基金supported by the Science and Technology Project of Guangdong (Grant No.2020B010190001)the National Natural Science Foundation of China (Grant No.11974119)+1 种基金the Guangdong Innovative and Entrepreneurial Research Team Program (Grant No.2016ZT06C594)the National Key R&D Program of China (Grant No.2018YFA 0306200).
文摘A supercontinuum white laser with ultrabroad bandwidth,intense pulse energy,and high spectral flatness can be accomplished via synergic action of third-order nonlinearity(3rd-NL)and second-order nonlinearity.In this work,we employ an intense Ti:sapphire femtosecond laser with a pulse duration of 50 fs and pulse energy up to 4 mJ to ignite the supercontinuum white laser.Remarkably,we use water instead of the usual solid materials as the 3rd-NL medium exhibiting both strong self-phase modulation and stimulated Raman scattering effect to create a supercontinuum laser with significantly broadened bandwidth and avoid laser damage and destruction.Then the supercontinuum laser is injected into a water-embedded chirped periodically poled lithium niobate crystal that enables broadband and high-efficiency second-harmonic generation.The output white laser has a 10 dB bandwidth encompassing 413 to 907 nm,more than one octave,and a pulse energy of 0.6 mJ.This methodology would open up an efficient route to creating a long-lived,high-stability,and inexpensive white laser with intense pulse energy,high spectral flatness,and ultrabroad bandwidth for application to various areas of basic science and high technology.
基金This work was supported by the National Natural Science Foundation of China(Nos.61125503,61235009,and 61801520)the Foundation for Development of Science and Technology of Shanghai(No.13]C1408300)+1 种基金the Natural Science Foundation of Hunan Province(Nos.2019JJ50756 and 2018JJ3521)the Scientific Research Project of Hunan Province Education Department(No.20B144).
文摘When two synchronized laser beams illuminate the inner surface of bulk lithium niobate crystals with magnesium doping(5%/mol MgO:LiNbO_(3))under the condition of total reflection,semi-degenerate four-wave mixing(FWM)is generated.On this basis,a more sophisticated frequency conversion process on the interface of nonlinear crystal has been researched.The generation mechanism of FWM is associated with the fundamental waves reflected on the inner surface of the nonlinear crystal.Analysis of the phase-matching mechanism confirms that the FWM is radiated by the third-order nonlinear polarized waves,which are stimulated by the third-order nonlinear susceptibility coefficient of the nonlinear crystal.Theoretically calculated and experimentally measured corresponding data have been presented in this article.These results are expected to provide new inspiration for further experimental and theoretical research on frequency conversion in nonlinear crystals.
文摘Nonlinear optical (NLO)materials are increaingly needed along with the development ofoptoelectronic technique. In recent years there has been a growth of interest in organic materialsfor their application in the field of nonlinear optics. This is because organic double-frequencymaterials can have much higher nonlinear optical coefficients,shorter response times and higherlaser damage thresholds than inorganic materials.
基金Project supported by the National Natural Science Foundation of China (No. 29890210)
文摘The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been calculated. The influences of molecular structure, donor, acceptor and the frequency of external field on β and γ, and the relationship between γ and the number of thiophene rings (i. e. conjugated chain length) have been studied using INDO/SCI methods combined with sum-overstate (SOS) formula. The calculated results show that γ is proportional to 2.69 power of the chain length of the conjugated molecular bonds when the length is not quite long.
