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Er:YAG laser technology for remote sensing applications

机译：Er：YAG激光技术在遥感领域的应用

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Fibertek has developed an injection locked, resonantly pumped Er:YAG solid-state laser operating at 1.6 μm capable of pulse repetition rates of 1 kHz to 10 kHz for airborne methane and water differential absorption lidars. The laser is resonantly pumped with a fiber-coupled 1532 nm diode laser minimizing the quantum defect and thermal loading generating tunable single-frequency output of 1645-1646 nm with a linewidth of < 100 MHz. The frequency-doubled 1.6 μm EnYAG laser emits wavelengths in the 822-823 nm spectrum, coincident with water vapor lines. Various cavity designs were studied and optimized for compactness and performance, with the optimal design being an injection seeded and locked five-mirror ring cavity. The laser generated 4 W of average power at pulse repetition frequencies (PRFs) of 1 kHz and 10 kHz, corresponding to 4 mJ and 400 μJ pulse energies, respectively. The 1645 nm was subsequently frequency doubled to 822.5 nm with a 600 pm tuning range covering multiple water absorption lines, with a pulse energy of 1 mJ and a pulse repetition frequency of 1 kHz. The resonator cavity was locked to the seed wavelength via a Pound Drever Hall (PDH) technique and an analog Proportional Integral Derivative (PID) Controller driving a high-bandwidth piezoelectric (PZT)-mounted cavity mirror. Two seed sources lasing on and off the methane absorption line were optically switched to tune the resonator wavelength on and off the methane absorption line between each sequential output pulse. The cavity locking servo maintained the cavity resonance for each pulse.
机译：Fibertek开发了一种注入锁定的，共振泵浦的Er：YAG固态激光器，工作频率为1.6μm，对于机载甲烷和水差分吸收激光雷达，其脉冲重复频率为1 kHz至10 kHz。激光器由光纤耦合的1532 nm二极管激光器谐振泵浦，从而最大程度地减少了量子缺陷和热负荷，产生了1645-1646 nm的可调单频输出，线宽<100 MHz。倍增的1.6μmEnYAG激光发射的光谱波长为822-823 nm，与水蒸气线一致。对各种腔体设计进行了研究，并针对紧凑性和性能进行了优化，最佳设计是注入晶种并锁定五镜环形腔体。激光器以1 kHz和10 kHz的脉冲重复频率（PRF）产生4 W的平均功率，分别对应于4 mJ和400μJ脉冲能量。随后将1645 nm的频率倍增至822.5 nm，调谐范围为600 pm，覆盖多条吸水线，脉冲能量为1 mJ，脉冲重复频率为1 kHz。谐振腔通过Pound Drever Hall（PDH）技术和模拟比例积分微分（PID）控制器锁定到种子波长，该控制器驱动高带宽压电（PZT）安装的腔镜。激光切换甲烷吸收线上和下的两个种子源，进行光学切换，以调节每个顺序输出脉冲之间甲烷吸收线上和下的共振器波长。腔锁伺服系统保持每个脉冲的腔共振。

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