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CHINESE OPTICS LETTERS 2024年第8期22卷 082601-082601页

作者： Chen, Weijie He, Zexiang Duan, Zhenzhen Yang, Jian Wang, Ning Wang, Dan Hu, Zexiong Chen, Nan Luo, Zhengqian Bu, Yikun Xiamen Univ Sch Elect Sci & Engn Natl Model Microelect Coll Xiamen 361005 Peoples R China Xiamen Univ Fujian Key Lab Ultrafast Laser Technol & Applicat Xiamen 361005 Peoples R China

Recently, the Fano resonance has played an increasingly important role in improving the color performance of structural colors. In this study, we further elucidate the asymmetric spectral shape generated by Fano resonance from a phase perspective and explore four distinct continuum state structures. By integrating the proposed cavity-like structure with a metal-dielectric-metal discrete state, multilayered thin-film structural colors with minimal background reflection, as low as 8%, were successfully achieved. The reflection peak of this structure exhibits a bandwidth of approximately 50 nm and reaches up to 80%, indicating heightened saturation and color brightness. Moreover, by adjusting the thickness, we effortlessly obtained a broader color gamut compared to Adobe ROB (45.2%), covering 56.7% of the CIE color space. Even adjusting a single layer can achieve a color gamut of 47.1%. In experiments, by deliberately choosing low oxygen- dependent materials, excellent ROB colors with high brightness and in high consistency with simulation results were successfully achieved. Therefore, the scheme's simple process for structural color creation, along with its excellent color performance and the ability to effectively replicate simulation characteristics makes it highly valuable in fields like anti- counterfeiting, decoration, display devices, and solar cell panels.

关键词： Fano resonance structural colors full color thin films high saturation

Field stabilization of pulse duration in a hundredfemtosecond level

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CHINESE OPTICS LETTERS 2024年第8期22卷 081406-081406页

作者： Liu, Runmin Wu, Yong Pu, Guoqing Cheng, Jiayang Mu, Huan Liu, Bowen Yi, Lilin Hu, Minglie Tianjin Univ Sch Precis Instruments & Optoelect Engn Key Lab Optoelect Informat Sci & Technol Minist EducUltrafast Laser Lab Tianjin 300072 Peoples R China Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn State Key Lab Adv Commun Syst & Networks Shanghai 200240 Peoples R China AIOPTICS Co Ltd R&D Ctr Shanghai 200240 Peoples R China

Pulse duration is considered as one of the most important characteristics of high-power femtosecond lasers. However, pulses output from the laser system are susceptible to ambient changes and manifest the instability of pulse durations in an open environment. In this paper, incorporating the algorithmic framework of the improved stochastic hill-climbing search and incremental proportional-integral controller, temperature-induced fluctuations of pulse duration can be effectively compensated by an automatic feedback control in an all-fiber chirped-pulse amplification system. In the experiment, sub-hundred femtosecond fluctuation of pulse duration is introduced to verify the performance robustness of the proposed pulse-duration feedback control (PDFC). The stability of pulse duration is obviously higher than the case without the feedback control, and the peak-to-peak fluctuation of pulse duration is reduced to 6.5%. Furthermore, the robust switching between different pulse durations proves the versatility of the PDFC. We expect that the proposed feedback control method could provide a novel insight into high-power femtosecond lasers widely applied in fundamental researches and industrial fields.

关键词： fiber amplifier femtosecond laser pulse-duration feedback control laser AMPLIFICATION

High-power compact continuous-wave Fe:ZnSe laser at 4 μ m with > 50% overall conversion efficiency

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CHINESE OPTICS LETTERS 2024年第8期22卷 081405-081405页

作者： Shen, Yanlong Wan, Yingchao Zhu, Feng Chai, Tongxing Wang, Yousheng Huang, Ke Northwest Inst Nucl Technol State Key Lab Laser Interact Matter Xian 710024 Peoples R China

We report on a compact, high-efficiency mid-infrared continuous-wave (CW) Fe:ZnSe laser pumped by a 2.9 mu m fiber laser under liquid nitrogen cooling. A maximum output power of 5.5 W and a slope efficiency of up to 66.3% with respect to the launched pump power were obtained. The overall optical-to-optical (OTO) conversion efficiency, calculated from the output of the 2.9 mu m fiber laser to the 4 mu m laser, was as high as 54.5%. The OTO efficiency and the slope efficiency are, to the best of our knowledge, the highest ever reported in Fe:ZnSe lasers. A rate-equation-based numerical model of CW operation was established, and the simulation agreed well with the experiment, identifying the routes used in the experiment for such high efficiency.

关键词： Fe ZnSe mid-infrared laser high efficiency solid-state laser FIBER laser FE-ZNSE TEMPERATURE

Resistless photochemical etching of a silicon wafer by UV laser with an H_2O_2 and HF aqueous solution

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Chinese Science Bulletin 2002年第2期47卷 164-167页

作者： YANG Jie, LIU Yanfa & M. Murahara State Key lab.ratory of ultrafast spectrosc.py of Zhongshan University, Guangzhou 510275, China Department of Electrical Engineering of Tokai University, Japan State Key lab. ultrafast spectrosc. Zhongshan University Guangzhou 510275 China

A new resistless etching method has been de-veloped for Silicon wafers. This new method uses an aqueous solution consisting of hydrogen peroxide (H2O2) and hydro-gen fluoride (HF) as the activating etchants. A 193 nm ArF excimer laser and a 266 nm fourth harmonic generation Nd:YAG laser were used as the photon sources. Results showed that pattern etching has been achieved without any photoresist film. In the case of the 193 nm laser, the optimal etching appeared at a 1.3 H2O2/HF ratio, where an etchdepth of 210 nm was achieved with a fluence of 29 mJ/cm2 and shot number of 10000. At the same conditions, the etch depth with H2O2 and HF solution was three times of that by using H2O and HF mixture. In the case of the 266 nm Nd : YAG laser, the optimal etching appeared at twice ratio of H2O2/HF, where the etch depth of 420 nm was achieved witha fluence of 12 mJ/cm2 and shot number of 30000. Results showed that the etch effect of the 266 nm Nd : YAG laser was more desirable than that of the 193 nm ArF

关键词： UV laser resistless photochemical etching hydrogen peroxide (H2O2).

ultrafast Carrier Dynamics in Ba_(6)Cr_(2)S_(10)Modified by Toroidal Magnetic Phase Transition

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Chinese Physics Letters 2024年第4期41卷 164-172页

作者：姜丽桐姜聪颖田义超赵惠张俊田珍耘付少华梁二军望贤成靳常青赵继民 Beijing National lab.ratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Strong-Field and ultrafast Photonics lab Institute of Laser EngineeringBeijing University of TechnologyBeijing 100124China School of Physics&lab.ratory of Zhongyuan Light Zhengzhou UniversityZhengzhou 450052China Songshan Lake Materials lab.ratory Dongguan 523808China

Ba_(6)Cr_(2)S_(10)is a recently discovered magnetic material,in which the spins are aligned ferromagnetically in the ab-plane and anti-parallelly in a paired form along the *** is characterized as a quasi-one dimensional(1D)dimerized structure with a ferrotoroidic order,forming the simplest candidate toroidal magnetic(TM)order and exhibiting an anti-ferromagnetic-like transition at around 10 ***-resolved ultrafast dynamics investigation of the novel A-Cr-S(A:metal elements)family of quantum materials has rarely been ***,we investigate the time-resolved pump-probe ultrafast dynamics of a Ba6Cr2S10 single crystal.A prominent change in the photo-excited carrier dynamics is observed at T_(c)=10 K,corresponding to the reported TM-paramagnetic phase transition.A potential unknown magnetic transition is also found at T^(*)=29 *** results provide new evidence for the TM magnetic transition in Ba_(6)Cr_(2)S_(10),and shed light on phase transitions in TM quantum materials.

关键词： ferromagnetic magnetic transition

Photoluminescence of fullerene in ultrathin orderedmultilayers: The dissociation of molecular aggregation

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Chinese Science Bulletin 1998年第12期43卷 1004-1008页

作者： MA Shihong+1, LU Xingze+1, XU Jianhua+1, CAI Zhigang+2,ZHOU Jianying+2, WANG Wencheng+1, ZHANG Zhiming+1 1. State Key Joint lab.ratory for Materials Modification by laser, Ion and Electron Beams, Department of Physics, Fudan University, Shanghai 200433, State Key Jt. lab. Mat. M. Department of Physics Fudan University Shanghai 200433 China ultrafast laser spectrosc. lab. Zhongshan University Guangzhou 510275 China

The aggregation behavior of a substituted fullerene compound, 1benzyl2hydrofullerene （C 60-Be）, in Ztype ultrathin ordered （e.g. LB） multilayers has been studied by UVvis absorption, steady state and timeresolved fluorescence spectrosc.pies. The LB multilayers of pure C 60Be showed Jaggregate formation, characterized by a large redshift of two absorption peaks （ΔE～2 098 cm -1 from 260→275 nm and ΔE～1 076 cm -1 from 328→340 nm, respectively）. The main fluorescence emission bands were found at 710, 646, 603, 600 and 595 nm for pure C 60-Be, mixed C 60-Be （molar percentage 50%, 25% and 20%, respectively） multilayers and monomeric C 60-Be in solution, respectively. The aggregates were dissociated by mixing with some inert materials. The fluorescence decay profiles of C 60-Be, mixed C 60-Be （molar percentage 50%, 25% and 20%, respectively） in LB films could be bestfitted by using a biexponential decay model.

关键词： fallerene molecular aggregation utrathin ordered multilayer time_resolved fluorescence.

Ultra-highly sensitive dual gases detection based on photoacoustic spectrosc.py by exploiting a long-wave,high-power,wide-tunable,singlelongitudinal-mode solid-state laser

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Light(Science & Applications) 2024年第5期13卷 941-956页

作者： Shunda Qiao Ying He Haiyue Sun Pietro Patimisco Angelo Sampaolo Vincenzo Spagnolo Yufei Ma National Key lab.ratory of laser Spatial Information Harbin Institute of TechnologyHarbinChina PolySense lab Dipartimento Interateneo di FisicaUniversity and Politecnico of BariVia AmendolaBariItaly

Photoacoustic spectrosc.py(PAS)as a highly sensitive and selective trace gas detection technique has extremely broad application in many ***,the laser sources currently used in PAS limit the sensing *** to diode laser and quantum cascade laser,the solid-state laser has the merits of high optical power,excellent beam quality,and wide tuning *** we present a long-wave,high-power,wide-tunable,singlelongitudinal-mode solid-state laser used as light source in a PAS sensor for trace gas *** self-built solid-state laser had an emission wavelength of~2μm with Tm:YAP crystal as the gain material,with an excellent wavelength and optical power stability as well as a high beam *** wide wavelength tuning range of 9.44 nm covers the absorption spectra of water and ammonia,with a maximum optical power of~130 mW,allowing dual gas detection with a single laser *** solid-state laser was used as light source in three different photoacoustic detection techniques:standard PAS with microphone,and external-and intra-cavity quartz-enhanced photoacoustic spectrosc.py(QEPAS),proving that solid-state laser is an attractive excitation source in photoacoustic spectrosc.py.

关键词： power tunable tuning

Life under tension: the relevance of force on biological polymers

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Biophysics Reports 2024年第1期10卷 48-56页

作者： Matthew T.J.Halma Longfu Xu Department of Physics and Astronomy and laser lab Vrije Universiteit Amsterdam LUMICKS B.V.

Optical tweezers have elucidated numerous biological processes, particularly by enabling the precise manipulation and measurement of tension. One question concerns the biological relevance of these experiments and the generalizability of these experiments to wider biological systems. Here, we categorize the applicability of the information garnered from optical tweezers in two distinct categories: the direct relevance of tension in biological systems, and what experiments under tension can tell us about biological systems, while these systems do not reach the same tension as the experiment, still, these artificial experimental systems reveal insights into the operations of biological machines and life processes.

关键词： Tension Optical tweezers Molecular force

Time-resolved photoluminescence: a precision tool for shallow trap density determination in perovskite films

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CHINESE OPTICS LETTERS 2024年第8期22卷 084001-084001页

作者： Chen, Wei Shi, Yifeng Wang, Pengxiang Zhang, Guodong Wang, Hu Zheng, Yifan Shao, Yuchuan Chinese Acad Sci Shanghai Inst Opt & Fine Mech Key Lab Mat High Power Laser Shanghai 201800 Peoples R China Univ Shanghai Sci & Technol Sch Mat Sci & Engn Shanghai 200093 Peoples R China

Determining the trap density in the absorbing layer thin film of perovskite solar cells is a critically important task, as it directly influences the efficiency of the devices. Here, we proposed time-resolved photoluminescence (TRPL) as a nondestructive method to assess trap density. A model was constructed to investigate carrier recombination and transition in perovskite materials. The model was utilized for numerical calculations and successfully fitted TRPL signals of perovskite materials. Furthermore, a genetic algorithm was employed to optimize the parameters. Finally, statistical methods were applied to obtain the parameters associated with the trap states of the material. This approach facilitates the successful determination of trap densities for different samples with clear differentiation.

关键词： perovskite solar cell time-resolved photoluminescence genetic algorithm trap density methylammonium lead triiodide SOLAR-CELLS DYNAMICS

High-Energy Tunable 6.5-12 μm Picosecond Mid-Infrared Radiation Generated from Optical Parametric Amplifier Based on LiInSe_(2) Crystal

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激光与光电子学进展 2024年第13期61卷 457-462页

作者： Zhang Jingjing Wang Shilei Yang Feng Wang Shanpeng Gao Hongwei Bo Yong Cui Dafu Tao Xutang Peng Qinjun Key lab.of Solid State laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key lab.ratory of Crystal Materials Shandong UniversityJinan 250100ShandongChina

We report high-energy tunable 6.5-12 μm ps mid-infrared radiation generation based on OPA pumped using 1064 nm laser in LISe *** simulated the relationship between the idler energy and crystal *** optimum LISe length of 4 mm was used to enhance the idler energy *** a pump energy of ~9.4 mJ, energy levels of ~146 and of ~27 μJ are generated at 6.5 μm and 12 μm, *** highest energy of ~205 μJ is achieved at 8.1 μm at a pump energy of ~19 ***, the angular and spectral width acceptance are measured.

关键词： tunable mid-infrared radiation nonlinear optical crystal LiInSe2 crystal optical parametric amplifier