【摘要】 近年来，相干探测激光雷达是测量远距离低空风切变的有效手段，1.6μm波段固体激光器以其人眼安全、探测器件成熟等优势成为相干雷达主要光源。其增益介质Er:YAG晶体在1 532 nm波段有较强的吸收峰，但吸收谱较窄，因此通过使用1 532 nm光纤激光器进行谐振泵浦可以有效提高晶体输出效率。为此，文中以Er/Yb双包层光纤为增益介质，1 532 nm光纤光栅为反射腔镜，976 nm半导体激光器为泵浦源，实现了全光纤化1 532 nm激光输出。输出激光最大功率73.44 W，波长可调谐范围为1 531.35～1 532.14 nm，波长谱宽为0.06 nm,x和y方向的光束质量M2分别为1.38和1.26，是1.6μm固体激光器的理想泵浦源。并采用此激光器泵浦Er:YAG非平面环形腔获得1.3 W单频激光输出，斜率效率为31.76%。更多还原

【Abstract】 In recent years, coherent detection lidar is an effective means to measure long-range low-altitude wind shear. 1.6 μm solid-state lasers have become the main light source for coherent radar with the advantages of human eye safety and mature detector devices. Its gain medium Er:YAG crystal had a strong absorption peak in the 1 532 nm band, but the absorption spectrum was narrow, so the crystal output efficiency can be effectively improved by resonant pumping using a 1 532 nm fiber laser. To this end, an all-fiber 1 532 nm laser output was achieved with an Er/Yb double-clad fiber as the gain medium, a 1 532 nm fiber grating as the reflective cavity mirror and a 976 nm semiconductor laser as the pumping source. The output laser had a maximum power of 73.44 W,a tunable wavelength range of 1 531.35-1 532.14 nm, a wavelength spectral width of 0.06 nm, and the beam quality M2 of 1.38 and 1.26 in x and y direction, which was an ideal pumping source for 1.6 μm solid-state lasers.The laser was used to pump Er: YAG nonplanar ring cavity to obtain 1.3 W single frequency laser output, and the slope efficiency was 31.76%.更多还原