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| 1 | 单腔双光梳技术显示文摘双光梳技术作为一种新型高分辨率、宽带光学测量技术,在气体吸收监测、绝对距离测量、泵浦探测、电磁频谱测量等领域中有重要应用。以低复杂度产生高质量的双光频梳是该技术走向现场检测、取得更广泛应用的关键瓶颈之一。以一台激光器实现高相干双光频梳生成的单腔双光梳技术的出现显著地推动了低复杂度双光梳测量技术的发展,成为了当前光频梳技术研究的重要方向。在这一新技术体系的产生与发展过程中,我国研究团队发挥了重要作用。回顾了近十年来单腔双光梳,特别是目前得到最多研究与应用的单腔双光梳光纤激光技术的发展历程,全面综述了单腔双光梳的多种技术路径及其特点,并对其未来发展趋势进行了分析和展望。 | 赵欣 杨建军 张力钎 郑铮 | 2022 | 中国激光2022，49，19： | 3 |
| 2 | Doppler velocimeter based on dual-comb absorption spectroscopy显示文摘The determination of airflow parameters is essential to the research of critical information on environment monitoring,chemical kinetics,and aerodynamic and propulsion applications.During the past few decades,tunable diode laser absorption spectroscopy has become a common and efficient tool for the flow velocity measurement based on the Doppler shift of the absorption line.Dual-comb absorption spectroscopy(DCAS),as a state-of-theart Fourier-transform broadband spectroscopic technique,not only can detect multiple trace molecules in parallel but also can extract Doppler shifts to derive the flow velocity through the analysis of dozens of molecular absorption lines simultaneously with high precision.Here,we report a proof-of-principle demonstration of the velocity measurements of acetylene at various flow velocities by means of a high-resolution and broadband DCAS.Mode-resolved Doppler-shifted rotational-vibrational lines in the P branch of acetylene molecules are obtained.A model for multiline Doppler frequency determination is investigated and experimentally verified.The flow velocity measurements with a measuring uncertainty down to the submeter per second over the range from 8.7 m/s to 44.8 m/s at an effective time resolution of 1 s and a measuring uncertainty of 1.97 m/s at 0.1 s are demonstrated.With broadband mid-infrared frequency combs covering atmospheric transmission windows,the open-path measurement for monitoring diffusion of the weak pollutant source would be realized. | CHENGLIN GU XING ZOU ZHONG ZUO DAOWANG PENG YUANFENG DI YANG LIU DAPING LUO WENXUE LI | 2020 | Photonics Research2020，8，12： | 2 |
| 3 | Sub-femtometer-resolution absolute spectroscopy with sweeping electro-optic combs显示文摘Optical frequency comb with evenly spaced lines over a broad bandwidth has revolutionized the fields of optical metrology and spectroscopy.Here,we propose a fast interleaved dual-comb spectroscopy with sub-femtometer-resolution and absolute frequency,in which two electro-optic frequency combs are swept.Electrically-modulated stabilized laser enables ultrahigh resolution of 0.16 fm(or 20 k Hz in optical frequency)and single-shot measurement in 90 ms.Total 20 million points are recorded spanning 3.2 nm(or 400 GHz)bandwidth,corresponding to a spectral sampling rate of 2.5×10^(8)points/s under Nyquist-limitation.Besides,considering the trade-off between the measurement time and spectral resolution,a fast single-shot measurement is also realized in 1.6 ms with 8 fm(or 1 MHz)resolution.We demonstrate the 25-averaged result with 30.6 d B spectral measurement signal-to-noise ratio(SNR)by reducing the filter bandwidth in demodulation.The results show great prospect for precise measurement with flexibly fast refresh time,high spectral resolution,and high SNR. | Bingxin Xu Xinyu Fan Shuai Wang Zuyuan He | 2022 | Opto-Electronic Advances2022，5，12： | 2 |
| 4 | Efficient generation of relativistic near-single-cycle mid-infrared pulses in plasmas显示文摘Ultrashort intense optical pulses in the mid-infrared(mid-IR)region are very important for broad applications ranging from super-resolution spectroscopy to attosecond X-ray pulse generation and particle acceleration.However,currently,it is still difficult to produce few-cycle mid-IR pulses of relativistic intensities using standard optical techniques.Here,we propose and numerically demonstrate a novel scheme to produce these mid-IR pulses based on laser-driven plasma optical modulation.In this scheme,a plasma wake is first excited by an intense drive laser pulse in an underdense plasma,and a signal laser pulse initially at the same wavelength(1 micron)as that of the drive laser is subsequently injected into the plasma wake.The signal pulse is converted to a relativistic multi-millijoule near-singlecycle mid-IR pulse with a central wavelength of ~5 microns via frequency-downshifting,where the energy conversion efficiency is as high as approximately 30% when the drive and signal laser pulses are both at a few tens of millijoules at the beginning.Our scheme can be realized with terawatt-class kHz laser systems,which may bring new opportunities in high-field physics and ultrafast science. | Xing-Long Zhu Su-Ming Weng Min Chen Zheng-Ming Sheng Jie Zhang | 2020 | Light(Science & Applications)2020，9，1： | 2 |
| 5 | Broadband 1-GHz mid-infrared frequency comb显示文摘Mid-infrared(MIR)spectrometers are invaluable tools for molecular fingerprinting and hyper-spectral imaging.Among the available spectroscopic approaches,GHz MIR dual-comb absorption spectrometers have the potential to simultaneously combine the high-speed,high spectral resolution,and broad optical bandwidth needed to accurately study complex,transient events in chemistry,combustion,and microscopy.However,such a spectrometer has not yet been demonstrated due to the lack of GHz MIR frequency combs with broad and full spectral coverage.Here,we introduce the first broadband MIR frequency comb laser platform at 1 GHz repetition rate that achieves spectral coverage from 3 to 13 μm.This frequency comb is based on a commercially available 1.56 μm mode-locked laser,robust all-fiber Er amplifiers and intra-pulse difference frequency generation(IP-DFG)of few-cycle pulses in x(2)nonlinear crystals.When used in a dual comb spectroscopy(DCS)configuration,this source will simultaneously enable measurements with μs time resolution,1 GHz(0.03 cm-1)spectral point spacing and a full bandwidth of>5 THz(>166 cm-1)anywhere within the MIR atmospheric windows.This represents a unique spectroscopic resource for characterizing fast and non-repetitive events that are currently inaccessible with other sources. | Nazanin Hoghooghi Sida Xing Peter Chang Daniel Lesko Alexander Lind Greg Rieker Scott Diddams | 2022 | Light(Science & Applications)2022，11，10： | 0 |
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