A direct Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser without the aid of any mode-locked starting element is reported for the first time. A pulse duration as short as 259 fs and a maximum average output power of 326...A direct Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser without the aid of any mode-locked starting element is reported for the first time. A pulse duration as short as 259 fs and a maximum average output power of 326 m W are obtained at a repetition rate of 97.1 MHz. The corresponding optical spectrum centered at 2053 nm exhibits a bandwidth of 19.8 nm,which indicates the presence of nearly Fourier transform-limited pulses. Such a Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser is a promising ultrashort pulse source, with both the excellent laser characteristics of Tm:LuYO3and the high-power 790 nm laser diode pumping scheme.展开更多
Room temperature sputtered inorganic nickel oxide(NiO_(x))is one of the most promising hole transport layers(HTL)for perovskite-sillion 2-terminal tandem solar cells with the aid of ultrathin and compact organic layer...Room temperature sputtered inorganic nickel oxide(NiO_(x))is one of the most promising hole transport layers(HTL)for perovskite-sillion 2-terminal tandem solar cells with the aid of ultrathin and compact organic layers to passivate the surface defects.In this study,the aromatic solvent with different substituent groups was used to regulate the conformation of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)am ine](PTAA)layer.As a result,the single-junction perovskite solar cell(PSC)gained a power conversion efficiency(PCE)of 20.63%,contributing to a 27.21%efficiency for monolithic perovskite/silicon(double-side polished)2-terminal tandem solar cell,by applying the alkyl aromatic solvent to enhance theπ-πstacking of PTAA molecular chains.The tandem solar cell can maintain 95%initial efficiency after aging over 1000 h.This study provides a universal approach for improving the photovoltaic performance of NiO_(x)/polymer-based perovskite/silicon tandem solar cells and other single junction inverted PSCs.展开更多
We demonstrate a high power,widely tunable femtosecond MgO-doped periodically poled lithium niobate(MgO:PPLN)optical parametric oscillator(OPO)at 151 MHz,pumped by a Kerr-lens mode-locked Yb:KGW laser.With a maximum p...We demonstrate a high power,widely tunable femtosecond MgO-doped periodically poled lithium niobate(MgO:PPLN)optical parametric oscillator(OPO)at 151 MHz,pumped by a Kerr-lens mode-locked Yb:KGW laser.With a maximum pump power of 7 W,the OPO is capable of delivering as high as 2.2 W of the signal centered around 1500 nm with tunable signal spectrum ranges of 1377 nm-1730 nm at an extraction efficiency of 31.4%,which exhibits a long-term passive power stability better than 0.71%rms over 4 h.The maximum idler bandwidths of 185 nm at 3613 nm are obtained across the idler tuning ranges of 2539 nm-4191 nm.By compensating intracavity dispersion,the signal has the shortest pulse duration of 170 fs at 1428 nm.展开更多
Organolead halide perovskite is a newly emerging low-cost,solution-processable material with a broadband absorption from the ultraviolet(UV)to visible(Vis)region,which has attracted a great deal of interest in high-pe...Organolead halide perovskite is a newly emerging low-cost,solution-processable material with a broadband absorption from the ultraviolet(UV)to visible(Vis)region,which has attracted a great deal of interest in high-performance optoelectronic devices.However,some practicable applications need a cover of UV–Vis–NIR region for photoelectric conversion,a task that remains a significant challenge for further extending the absorption toward the near-infrared radiation(NIR)region.Here,to the best of our knowledge,we prove for the first time an ultrasensitive flexible broadband photodetector based on porous organolead perovskitephthalocyanine heterostructure,which combines the synergetic properties of high UV–Vis absorbance of perovskite with enhanced NIR absorption for triclinic lead phthalocyanine.The photosensitivity of the as-prepared devices reaches up to 10^(4) at a low intensity of 10mWcm^(−2),which is among the largest values reported for broadband photodetectors.Significantly,performed at room temperature,the device achieves a pA scale dark current along with an ultrafast response speed of less than 0.6 ms for as-adopted full spectra.Our results provide an easy and promising route to develop low-cost,flexible and highly sensitive UV–Vis–NIR photodetectors.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 62165012 and 61665010)Key research and development projects in Gansu Province (Grant No. 21YFIGE300)+5 种基金Gansu Province College Industry Support Plan Project (Grant Nos. 2020C-23 and 2022CYZC-59)Department of Education of Gansu Province: The Education Project of Open Competition for the Best Candidates (Grant No. 2021jyjbgs-06)Gansu Provincial University Innovation Fund Project (Grant No. 2021B-190)Qinzhou District Science and Technology Plan Project (Grant No. 2021-SHFZG1442)Gansu Province College Young Doctor Support Project (Grant No. 2023QB-013)Gansu Province Excellent Graduate Innovation Star Project (Grant No. 2022CXZX796)。
文摘A direct Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser without the aid of any mode-locked starting element is reported for the first time. A pulse duration as short as 259 fs and a maximum average output power of 326 m W are obtained at a repetition rate of 97.1 MHz. The corresponding optical spectrum centered at 2053 nm exhibits a bandwidth of 19.8 nm,which indicates the presence of nearly Fourier transform-limited pulses. Such a Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser is a promising ultrashort pulse source, with both the excellent laser characteristics of Tm:LuYO3and the high-power 790 nm laser diode pumping scheme.
基金supported by the National Key R&D Program of China(2018YFB1500103)the National Natural Science Foundation of China(62104082)+1 种基金the Guangdong Basic and Applied Basic Research Foundation(2022A1515010746,2022A1515011228)the Science and Technology Program of Guangzhou(202201010458)。
文摘Room temperature sputtered inorganic nickel oxide(NiO_(x))is one of the most promising hole transport layers(HTL)for perovskite-sillion 2-terminal tandem solar cells with the aid of ultrathin and compact organic layers to passivate the surface defects.In this study,the aromatic solvent with different substituent groups was used to regulate the conformation of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)am ine](PTAA)layer.As a result,the single-junction perovskite solar cell(PSC)gained a power conversion efficiency(PCE)of 20.63%,contributing to a 27.21%efficiency for monolithic perovskite/silicon(double-side polished)2-terminal tandem solar cell,by applying the alkyl aromatic solvent to enhance theπ-πstacking of PTAA molecular chains.The tandem solar cell can maintain 95%initial efficiency after aging over 1000 h.This study provides a universal approach for improving the photovoltaic performance of NiO_(x)/polymer-based perovskite/silicon tandem solar cells and other single junction inverted PSCs.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.62165012 and 61665010)the Key Research and Development Projects in Gansu Province,China(Grant No.21YFIGE300)+4 种基金Gansu Province College Industry Support Plan Project(Grant Nos.2020C-23 and 2022CYZC-59)the Natural Science Foundation of Gansu Province,China(Grant Nos.21JR7RE173 and 20JR5RA494)Qinzhou District Science and Technology Plan Project(Grant No.2021-SHFZG-1442)the Scientific Research Innovation Platform Construction Project of Tianshui Normal University,Gansu Province,China(Grant No.PTJ2022-06)Science and Technology Supporting Program Project of Tianshui City(Grant Nos.2022-FZJHK-8548,2019-FZJHK-9891,and 2020-FZJHK-9757).
文摘We demonstrate a high power,widely tunable femtosecond MgO-doped periodically poled lithium niobate(MgO:PPLN)optical parametric oscillator(OPO)at 151 MHz,pumped by a Kerr-lens mode-locked Yb:KGW laser.With a maximum pump power of 7 W,the OPO is capable of delivering as high as 2.2 W of the signal centered around 1500 nm with tunable signal spectrum ranges of 1377 nm-1730 nm at an extraction efficiency of 31.4%,which exhibits a long-term passive power stability better than 0.71%rms over 4 h.The maximum idler bandwidths of 185 nm at 3613 nm are obtained across the idler tuning ranges of 2539 nm-4191 nm.By compensating intracavity dispersion,the signal has the shortest pulse duration of 170 fs at 1428 nm.
基金the National Natural Science Foundation of China Grant No.10974074,61540076the Research Fund for the Doctoral Program of Higher Education of China Grant No.20110211110005the Research Project of Graduate Teacher of Gansu Province Grant No.2014B-079.
文摘Organolead halide perovskite is a newly emerging low-cost,solution-processable material with a broadband absorption from the ultraviolet(UV)to visible(Vis)region,which has attracted a great deal of interest in high-performance optoelectronic devices.However,some practicable applications need a cover of UV–Vis–NIR region for photoelectric conversion,a task that remains a significant challenge for further extending the absorption toward the near-infrared radiation(NIR)region.Here,to the best of our knowledge,we prove for the first time an ultrasensitive flexible broadband photodetector based on porous organolead perovskitephthalocyanine heterostructure,which combines the synergetic properties of high UV–Vis absorbance of perovskite with enhanced NIR absorption for triclinic lead phthalocyanine.The photosensitivity of the as-prepared devices reaches up to 10^(4) at a low intensity of 10mWcm^(−2),which is among the largest values reported for broadband photodetectors.Significantly,performed at room temperature,the device achieves a pA scale dark current along with an ultrafast response speed of less than 0.6 ms for as-adopted full spectra.Our results provide an easy and promising route to develop low-cost,flexible and highly sensitive UV–Vis–NIR photodetectors.
