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:2019-03-07  点此下载全文
引用本文:
摘要点击次数: 40
全文下载次数: 0
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大气压力垂直廓线探测最有希望的遥感仪器。这里介绍了一种氧气A带差分吸收激光雷达的发射机,可用于大气压力探测。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,采用一个非直线型、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。此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),在工作期间能够得到保持。激光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。因此该系统具有精确探测大气压力的应用潜力。
中文关键词:差分吸收激光雷达,大气压力,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:Differential absorption lidar is a promising technique to close the gaps that exist in global measurement of surface atmospheric pressure or range resolved atmospheric pressure. A transmitter of differential absorption lidar (DIAL) system for atmospheric pressure in oxygen A band is introduced. The laser transmitter system is based on a injection seeded optical parametric oscillator/optical parametric amplifier configuration. As the slave laser a unidirectional KTP ring optical parametric oscillator is used, which is injection seeded by the master laser, a cw external cavity diode laser. The seed laser is actively stabilized by means of high precision wavelength meter with a PID (proportional-integral-derivative) servo control loop. Single longitudinal mode stability of the OPO output usually requires the length of the optical cavity to be controlled with the “ramp-hold-fire” technique. It is demonstrated that this laser transmitter system has, the high frequency stability (30MHz rms), narrow bandwidth (Fourier transform limited-bandwidth 150MHz), and high pulse energy (≥45mJ) in the oxygen A band. These specifications could fulfill the requirements for atmospheric pressure measurements with an error caused by laser properties of <0.3% in the whole troposphere. The specifications are maintained during long-term operation in the field. The single-mode operation of this laser transmitter system makes the narrow-band detection of the DIAL backscatter signal possible. Thus the system has the potential to be used for accurate atmospheric pressure measurements.
keywords:DIAL, differential absorption lidar (280.1910), pressure measurement (120.5475), parametric oscillators and amplifiers (190.4970), injection-locked (140.3520)
  查看/发表评论  下载PDF阅读器

版权所有:《红外与毫米波学报》编辑部