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High-performance 800-1050 nm seed pulses based on spectral broadening and filtering for petawatt lasers

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High Power Laser Science and Engineering 2023年第1期11卷 61-66页

作者： Wenhai Liang Renjing Chen Yilin Xu Yaping Xuan Peng Wang Jun Liu Ruxin Li State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Zhangjiang Laboratory ShanghaiChina

High-performance 86μJ,11.2 fs pulses with a spectrum range of 800-1050 nm are generated based on 1030 nm,190 fs Yb femtosecond pulses by using multi-plate-based spectral broadening and *** advantage of single beam configuration,the obtained pulses have excellent power and spectral *** the output spectrum is obtained by spectrally filtering the broadened components,the temporal contrast of the output pulses is enhanced by at least four orders of *** with the robust and simple setup,the proposed method is expected to be a competitive option for the generation of seed pulses for 10s-100s petawatt lasers.

关键词： pulse compression seed pulse spectral broadening temporal contrast

Utilizing phase-shifted long-period fiber grating to suppress spectral broadening of a high-power fiber MOPA laser system

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High Power Laser Science and Engineering 2021年第3期9卷 33-39页

作者： Yinxu Bian Kerong Jiao Xuecheng Wu Hua Shen Feiyan Yang Rihong Zhu School of Electronic Engineering and Optoelectronic Technology Nanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Advanced Solid Laser Nanjing University of Science and TechnologyNanjing 210094China Department of Material Science and Engineering University of California Los AngelesLos AngelesCA 90095USA

Suppressing nonlinear effects in high-power fiber lasers based on fiber gratings has become a *** present,research is mainly focused on suppressing stimulated Raman scattering in a high-power fiber ***,the suppression of spectral broadening,caused by self-phase modulation or four-wave mixing,is still a challenging attribute to the close distance between the broadened laser and signal *** using a traditional fiber grating with only one stopband to suppress the spectral broadening,the signal power will be stripped *** this challenge,we propose a novel method based on phase-shifted long-period fiber grating(PS-LPFG)to suppress spectral broadening in a high-power fiber master oscillator power amplifier(MOPA)laser system in this paper.A PS-LPFG is designed and fabricated on 10/130 passive fiber utilizing a point-by-point scanning *** resonant wavelength of the fabricated PS-LPFG is 1080 nm,the full width at half maximum of the passband is 5.48 nm,and stopband extinction exceeds 90%.To evaluate the performance of the PS-LPFG,the grating is inserted into the seed of a kilowattlevel continuous-wave MOPA *** results show that the 30 dB linewidth of the output spectrum is narrowed by approximately 37.97%,providing an effective and flexible way for optimizing the output linewidth of highpower fiber MOPA laser systems.

关键词： fiber optics component high-power fiber laser nonlinear effects phase-shifted long-period fiber grating spectral broadening

Generation of ultrafast radially polarized pulses through chirp-assisted femtosecond optical parametric amplification

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 51-57页

作者： SaiSai Hu JieFeng Huang XinHao Ren ChangWen Xu ShiXiang Xu DianYuan Fan HaiZhe Zhong International Collaborative Laboratory of 2D Materials for Optoelectronic Science&Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Radially polarized beams characterized by an axially symmetric polarization distribution can be sharply focused to produce strong longitudinal fields in the *** applications of these beams will be facilitated by the availability of higher powers and shorter ***,the ultrafast radially polarized pulse is typically generated via wavefront reconstruction from conventional linearly polarized *** pulse duration and intensity limits are strictly dependent on extra-cavity ***,a chirp-assisted near-degenerate type-II parametric process is presented as a pulse-energy-scalable method of accessing ultrafast radially polarized *** a proof-of-principle experiment,the broadband gain balance between the orthogonally polarized signal components was realized via controlling the chirp of the pump *** an analogous pulseduration transfer effect,the radially polarized signal inherited the temporal and spectral characteristics of the pump pulse and maintained the radial polarization state of each frequency component of the *** a shorter pump pulse,the generation of few-cycle radially polarized pulses should be achievable,which may facilitate a wide range of ultrafast applications such as vacuum electron acceleration and high-harmonic generation.

关键词： radially polarized beam optical parametric amplifier ultrafast lasers spectral broadening optical parametric phase

The broadband laser source and an active beam stabilization device for laser calibration systems

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Radiation Detection Technology and Methods 2023年第3期7卷 364-371页

作者： Yang Wang Lei Xie Qinning Sun Long Chen Fengrong Zhu Yong Zhang School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 611756China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Purpose Currently,the calibration for astronomical telescopes requires a broadwavelength range of several hundred ***,a simple and compact wavelength broadening device is applied to generate a variety of *** addition,a beam stabilization system is designed to automatically correct the beam deviation due to vibration and temperature *** We broaden the laser spectrum by nonlinear effect between the noble gas in a hollow-core fiber and the laser electric *** selecting the species and pressure of the noble gases,one can control the spectral *** active beam stabilization system consists of two mirror mounts with motorized actuators and two CCD *** acquiring the centroid of the laser beam and comparing it with the target position,an algorithm is implemented to correct the beam *** Both experimental and simulation results show that the spectral range of the laser is greatly ***,we have attained the phase of *** parameters can be used to monitor the laser’s running status over *** active stabilization system can quickly correct the deviation of beam pointing and simultaneously obtain the beam profile,allowing for nominally perfect control of the *** In our design,both the broadband laser source and beam stabilizer are involved in the laser calibration system,providing us with various wavelengths and a high-precision pointing with outstanding intrinsic long-term stability.

关键词： Laser calibration spectral broadening Beam stabilization