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High-power, Narrow-linewidth, 1.5-μm Fiber Amplifier LIDAR Transmitter for Atmospheric CO_2 Detection

机译:大功率,窄线宽,1.5μm光纤放大器激光雷达发射器,用于大气CO_2检测

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This paper demonstrates a next-generation high-energy, eye-safe light detection and ranging (LIDAR) transmitter for the Active Sensing of CO_2 Emissions over Nights, Days, and Seasons (ASCENDS) mission. The system design is based on an advanced eye-safe, polarization-maintaining (PM) master oscillator-power amplifier (MOPA) LIDAR transmitter platform currently under development at Fibertek. This platform consists of a narrow linewidth (400 Hz - 1MHz) and highly stable seed laser, a flexible and reconfigurable pulse generator, and multiple stages of PM Erbium (Er)-doped fiber amplifiers (EDFAs) with increasing mode-field area. Using this architecture, we have demonstrated more than 20W continuous wave (CW) at 1571nm, up to 475 μJ energy per pulse at 1572 nm, and up to 250 μJ energy per pulse at 1529 nm wavelength with 1.5 μs pulsewidth and 10 kHz repetition rate. The output beams at the highest energy levels are diffraction limited, and the polarization extinction ratio (PER) is ~17dB. The optical efficiency is about 36% at CW operation and the optical-to-optical conversion efficiency is ~17% with respect to total pump power when the laser is in pulse operation mode. We also demonstrate a comparable optical efficiency (30%) with CW operation using radiation-harden Er-doped gain fiber.
机译:本文演示了下一代高能,人眼安全的光检测和测距(LIDAR)发射器,该发射器可对夜,日和季节的CO_2排放进行主动感测(ASCENDS)。该系统设计基于is火科技目前正在开发的高级人眼安全,偏振保持(PM)主振荡器-功率放大器(MOPA)LIDAR发射器平台。该平台包括一个窄线宽(400 Hz-1MHz)和高度稳定的种子激光器,一个灵活且可重新配置的脉冲发生器,以及具有增加的模场面积的多级掺PM b(Er)的光纤放大器(EDFA)。使用这种架构,我们已经展示了在1571nm处超过20W的连续波(CW),在1572 nm处每个脉冲的能量高达475μJ,在1529 nm波长下每个脉冲的能量高达250μJ,脉冲宽度为1.5μs,重复频率为10 kHz 。最高能级的输出光束受到衍射限制,偏振消光比(PER)为〜17dB。相对于总泵浦功率,当激光器处于脉冲工作模式时,连续波工作时的光学效率约为36%,光-光转换效率约为〜17%。我们还展示了使用辐射硬化的掺Er增益光纤在连续波操作下具有可比的光学效率(30%)。

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