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Chinese Physics B 2023年第10期32卷 448-452页

作者：张旭王兆华王羡之李佳文李佳俊赵国栋魏志义 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

A cylindrical vector beam is utilized to enhance the energy scale of the pulse post-compressed in a bulk-material Herriott multi-pass cell(MPC).The method proposed here enables,for the first time to the best of our knowledge,pulse compression from 14 ps down to 475 fs with throughput energy beyond 1 mJ,corresponding to a compression ratio of 30,which is the highest pulse energy and compression ratio in single-stage bulk-material ***,we demonstrate the characteristic of the vector polarization beam is preserved in the MPC.

关键词： cylindrical vector beam post-compression multi-pass cell

Temporal contrast enhancement by nonlinear elliptical polarization rotation in a multi-pass cell

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High Power Laser Science and Engineering 2022年第5期10卷 14-19页

作者： Jiajun Song Liya Shen Jianyu Sun Yujie Peng Yuxin Leng State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)ShanghaiChina School of Physical Science and Technology ShanghaiTech UniversityShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina

We demonstrate the simultaneous temporal contrast improvement and pulse compression of a Yb-doped femtosecond laser via nonlinear elliptical polarization rotation in a solid state multi-pass *** temporal contrast is improved to 109,while the pulse is shortened from 181 to 36 fs,corresponding to a compression factor of *** output beam features excellent beam quality with M^(2) values of 1.18×*** total efficiency of the contrast enhancement system exceeds 50%.This technique will have wide applications in high temporal contrast ultra-intense femtosecond lasers.

关键词： multi-pass cell nonlinear elliptical polarization rotation pulse compression temporal contrast

A highly sensitive LITES sensor based on a multi-pass cell with dense spot pattern and a novel quartz tuning fork with low frequency

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Opto-Electronic Advances 2024年第3期7卷 26-34页

作者： Yahui Liu Shunda Qiao Chao Fang Ying He Haiyue Sun Jian Liu Yufei Ma National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of TechnologyHarbin 150000China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450000China Advanced Microscopy and Instrumentation Research Center School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China.

A highly sensitive light-induced thermoelectric spectroscopy(LITES)sensor based on a multi-pass cell(MPC)with dense spot pattern and a novel quartz tuning fork(QTF)with low resonance frequency is reported in this *** erbi-um-doped fiber amplifier(EDFA)was employed to amplify the output optical power so that the signal level was further *** optical path length(OPL)and the ratio of optical path length to volume(RLV)of the MPC is 37.7 m and 13.8 cm^(-2),respectively.A commercial QTF and a self-designed trapezoidal-tip QTF with low frequency of 9461.83 Hz were used as the detectors of the sensor,*** target gas selected to test the performance of the system was acetylene(C2H2).When the optical power was constant at 1000 mW,the minimum detection limit(MDL)of the C2H2-LITES sensor can be achieved 48.3 ppb when using the commercial QTF and 24.6 ppb when using the trapezoid-al-tip *** improvement of the detection performance by a factor of 1.96 was achieved after replacing the commer-cial QTF with the trapezoidal-tip QTF.

关键词： light-induced thermoelectric spectroscopy quartz tuning fork multi-pass cell gas sensing

Generation of 601 fs pulse from an 8 kHz Nd:YVO_(4) picosecond laser by multi-pass-cell spectral broadening

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Chinese Optics Letters 2021年第9期19卷 116-120页

作者： Jiajun Song Zhaohua Wang Xianzhi Wang Renchong Lü Hao Teng Jiangfeng Zhu Zhiyi Wei Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 1000A9China School of Physics and Optoelectronic Engineering Xidian UniversityXi'an 710071China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China

We demonstrate nonlinear pulse compression of an 8 k Hz Nd:YVO4 picosecond laser using the multi-pass-cell(MPC) technique with fused silica as the nonlinear medium. The pulse duration is compressed from 12.5 ps to 601 fs, corresponding to a pulse shortening factor of 20.8. The output pulse energy is 154 μJ with an efficiency of 74.5%. To the best of our knowledge,this is the highest pulse compression ratio achieved in a single-stage MPC with bulk material as the nonlinear medium. The laser power stability and the beam quality(M2) before and after the MPC are also experimentally studied. Both the laser power stability and the beam quality are barely deteriorated by the MPC device.

关键词： multi-pass cell Nd:W04 compression ratio femtosecond laser

Application of a characterized difference-frequency laser source to carbon monoxide trace detection

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Chinese Physics B 2012年第6期21卷 257-263页

作者： Alireza Khorsandi Zahra Shabani Monireh Ranjbar S. Ali Hoseinzadeh Salati Department of Physics University of Isfahan81746-73441 IsfahanIran

A tunable continuous wave（cw） mid-infrared（MIR） laser based on difference-frequency generation（DFG） in a 1.5-cm long AgGaS2 nonlinear crystal for trace gas detection is *** visible and near-infrared diode lasers were used as pump and signal *** MIR-DFG laser was tunable in a wavelength range of 4.75 μm-4.88 μ*** phase-matching（PM） condition was non-critically achieved by adjusting the temperature of the crystal for fixed pairs of input pump and signal *** required PM temperatures of the generated MIR-DFG wavelengths have been calculated by using three sets of recent Sellmeier equations and the temperature-dispersion equations of AgGaS2 given by Willer U,et al.（Willer U,Blanke T and Schade W 2001 ***.40 5439）.Then the calculated PM temperatures are compared with the experimental *** performance of the MIR-DFG laser is shown by the trace detection of the P（16） carbon monoxide（12C16O） absorption line in a laboratory-fabricated absorption *** enhanced sensitivity of about 0.6×10 4 was obtained through the long path absorption provided by consecutive reflections between coated cylindrical mirrors of a constructed cell.

关键词： difference-frequency generation AgGaS2 crystal multi-pass cell

Influence of laser intensity in second-harmonic detection with tunable diode laser multi-pass absorption spectroscopy

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Chinese Physics B 2005年第9期14卷 1904-1909页

作者：阚瑞峰董凤忠张玉钧刘建国刘诚王敏高山虎陈军 Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026 China

Tunable diode laser absorption spectroscopy （TDLAS） has been widely employed in atmospheric trace gases detection. The ratio of the second-harmonic signal to the intensity of laser beam incident to the multi-pass cell is proved to be proportional to the product of the path length and the gas concentration under any condition. A new calibration method based on this relation in TDLAS system for the measurement of trace gas concentration is proposed for the first time. The detection limit and the sensitivity of the system are below 110 and 31ppbv （parts-per-billion in volume）, respectively.

关键词： tunable diode laser absorption spectroscopy multi-pass cell harmonic detection wavelength modulation

Mid-infrared Optical Frequency Comb-based Fourier Transform Spectrometer for Broadband Molecular Spectroscopy

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Chinese Journal of Chemical Physics 2024年第4期37卷 471-480,I0093页

作者： Feihu Cheng Weixiong Zhao Bo Fang Nana Yang Shuangshuang Li Weijun Zhang Lunhua Deng Weidong Chen Laboratory of Atmospheric Physico-Chemistry Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China State Key Laboratory of Precision Spectroscopy and Department of PhysicsEast China Normal UniversityShanghai 200062China Laboratoire de Physicochimie de'Atmosphere Universite du Littoral Cote d'OpaleDunkerque 59140France

Optical frequency combbased Fourier transform spectroscopy has the features of broad spectral bandwidth,high sensitivity,andmultiplexed trace gas detection,which has valuable application potential in the fields of precision spectroscopy and trace gas ***,we report the development of a mid-infrared Fourier transform spectrometer based on an optical frequency comb combined with a Herriott-type multipass *** this instrument,the broadband absorption spectra of several important molecules,including methane,acetylene,water molecules and nitrous oxide,are measured by near real-time data acquisition in the 2800-3500 cm^(-1)spectral *** achieved minimum detectable absorption of the instrument is 4.4×10^(-8)cm^(-1)·Hz^(-1/2)per spectral *** spectra of H_(2)0 are fited using the Voigt profile multispectral fitting technique and the consistency of the concentration inversion is 1%.Our system also enables precise spectroscopic measurements,and it allows the determination of the spectral line positions and upper state constants of N_(2)O in the(0002)-(1000)band,with results in good agreement with those reported by Toth[***.30,5289(1991)].

关键词： Mid-infrared optical frequency comb multi-pass cell Fourier transform infrared spectrometer

Application of α-β-γ filtering to real-time atmosphere methane concentration measurement

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Chinese Physics B 2006年第6期15卷 1379-1383页

作者：阚瑞峰刘文清张玉钧刘建国陈东王敏 Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

A real time α-β-γ filtering technique is applied to the monitoring of atmosphere CH4 based on a tunable diode laser spectrum system operating at 1.654μm. This technique is developed for improving the sensitivity and precision of CH4 concentration measurement with slow concentration change. The effectiveness of this technique is evaluated by performing CH4 concentration measurement and using it to monitor the varying methane level in the atmosphere. It was proved that signal noise ratio enhancement factor is 4.25. The comparison between this filter and moving average is also included in this article. It indicates the advantage of the α-β-γ real time filter.

关键词： tunable diode laser absorption spectroscopy multi-pass cell harmonic detection