探测大气压力的差分吸收激光雷达的一种光发射机
投稿时间:2018-09-29  修订日期:2019-05-25  点此下载全文
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作者单位E-mail
洪光烈 中国科学院上海技术物理研究所 glhong@mail.sitp.ac.cn 
王钦 中国科学院大学  
肖春雷 中国科学院上海技术物理研究所  
孔伟 中国科学院上海技术物理研究所  
王建宇 中国科学院上海技术物理研究所 jywang@mail.sitp.ac.cn 
基金项目:国家自然科学基金项目(面上项目),
中文摘要:大气压力是气象学研究和数值天气预报中十分重要的参数。差分吸收激光雷达是对地表大气压力和对流层大气压力垂直廓线探测最有希望的遥感仪器之一。这里介绍了一种氧气A带差分吸收激光雷达的发射机,试图用于大气压力探测实验。该激光发射机是基于种子注入的光参量振荡器和光参量放大器的结构。作为从振荡器,采用一个环形腔KTP光参量振荡器。作为注入种子的主振荡器,即一个连续波外腔调谐二极管激光器。该连续波外腔调谐二极管激光器,由高精度的波长计构成的一个PID(Proportional-Integral-Derivative)伺服控制环,稳定其工作波长。向光参量振荡器的谐振腔注入连续波的种子激光,通过“Ramp-Hold-Fire”技术,锁定OPO(Optical Parametric Oscillator) 谐振腔的腔长。经过证实,这个激光发射机,具有以下性能:高的光频率稳定性(30MHz/rms),窄的线宽(傅立叶转换限),和高的脉冲能量(≥45mJ),能够在工作期间得以保持。发射机系统以单纵模式工作,使得差分吸收激光雷达对后向散射光信号的窄带探测成为可能。因而此类系统具有精确探测大气压力的发展潜力。
中文关键词:大气压力,差分吸收激光雷达,光参量振荡器/光参量放大器,注入锁定
 
A laser transmitter of differential absorption lidar for atmospheric pressure measurement
Abstract:Atmospheric pressure is a very important parameter in meteorological research and numerical weather prediction. Differential absorption lidar is one of the most promising remote sensing instruments for surface atmospheric pressure and vertical profile of tropospheric pressure. Here is a transmitter for an oxygen-band differential absorption lidar that is tried for atmospheric pressure detection experiment. The laser transmitter is based on the structure of a seed-injected optical parametric oscillator and an optical parametric amplifier. As a slave oscillator, a ring cavity KTP optical parametric oscillator is used. As the master oscillator, is a continuous wave external cavity diode laser. Operating wavelength of the continuous wave external cavity diode laser was stabilized, by a PID (Proportional-Integral-Derivative) servo control loop composed of a high-precision wavelength meter. A continuous wave seed laser is injected into the optical parametric oscillator cavity, and the cavity length of the OPO (Optical Parametric Oscillator) resonator is locked by the “Ramp-Hold-Fire” technique. This laser transmitter has been proven to have the following properties: high optical frequency stability (30MHz/rms), narrow linewidth (Fourier transform limited), and high pulse energy (≥45mJ),which can be maintained during operation. The transmitter system operates with a single longitudinal mode, making it possible for differential absorption lidar to detect narrowband backscattering signals. Such systems therefore have the developing potential to accurately measure atmospheric pressure.
keywords:DIAL, differential absorption lidar (280.1910), pressure measurement (120.5475), parametric oscillators and amplifiers (190.4970), injection-locked (140.3520)
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