论文标题
在1645 nm处的全纤维激光源，用于甲烷浓度和风速的激光雷达测量
All-fiber laser source at 1645 nm for lidar measurement of methane concentration and wind velocity
论文作者
论文摘要
我们报告了全纤维激光源的实现，该激光源基于被动纤维中刺激的拉曼散射，在线性极化的单模光束上以线性极化的单模光束进行单频脉冲。脉冲能达到14 $ $ j，重复速率为20 kHz，光谱线宽为9.5 MHz，几乎用于100 ns正方形脉冲的傅立叶转换有限。据我们所知，在全纤维激光源中，这种能量是1645 nm报告的最多的能量。我们的方法包括通过清除泵束的光学频率以及在放大纤维上施加应变梯度，分别降低了泵和信号脉冲的刺激的布里鲁因散射（SB）的增益。现在，这种紧凑的激光源现已用于可运输的激光雷达系统中，以同时测量风速和甲烷（CH4）浓度。
We report on the realization of an all-fiber laser source that delivers single-frequency pulses at 1645 nm, on a linearly polarized single-mode beam, based on stimulated Raman scattering in passive fibers. The pulse energy reaches 14 $μ$J, for a repetition rate of 20 kHz, and the spectral linewidth is 9.5 MHz, almost Fourier-transform limited for the 100 ns square pulses. To the best of our knowledge, this energy is the highest reported at 1645 nm in an all-fiber laser source. Our method consists in reducing the stimulated Brillouin scattering (SBS) gain for the pump and signal pulses, respectively by sweeping the optical frequency of the pump beam, and by applying a strain gradient on the amplification fiber. This compact laser source is now used in a transportable lidar system to measure simultaneously wind velocity and methane (CH4) concentration.
