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arXiv 2011.06308physics.opticsphysics.ao-ph
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1645 nm全光纤laser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

Philippe Benoit, Simon Le Méhauté, Julien Le Gouët, Guillaume Canat

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摘要：

我们报告实现的全光纤激光源，提供单频脉冲在1645 nm，线偏振单模光束，基于受激拉曼散射在无源光纤。脉冲能量达到14 $μ$ J，重复频率为20 kHz，谱线宽度为9.5 MHz，对于100 ns的方波脉冲几乎是傅立叶变换极限。据我们所知，在全光纤激光源中，该能量在1645 nm处是最高的。我们的方法包括在减少受激布里渊散射（SBS）增益的泵浦和信号脉冲，分别通过扫描泵浦光束的光频率，并通过施加应变梯度的放大光纤。这种紧凑的激光源现在用于可移动的激光雷达系统，以同时测量风速和甲烷（CH4）浓度。

英文摘要：

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.

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