1532nm全光纤Er/Yb共掺杂激光器

1532nm all-fiber Er/Yb co-doped laser

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1532nm波段有较强的吸收峰,但吸收谱较窄,因此通过使用1532nm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,1532nm光纤光栅为反射腔镜,976nm半导体激光器为泵浦源,实现了全光纤化1532nm激光输出。输出激光最大功率73.44 W,波长可调谐范围为1531.35~1532.14nm,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1.3W单频激光输出,斜率效率为31.76%。

In recent years,coherent detection lidar is an effective means to measure long-range low-altitude wind shear.1.6μm 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 1532nm band,but the absorption spectrum was narrow,so the crystal output efficiency can be effectively improved by resonant pumping using a 1532nm fiber laser.To this end,an all-fiber 1532nm laser output was achieved with an Er/Yb double-clad fiber as the gain medium,a 1532nm 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 73.44W,a tunable wavelength range of 1531.35-1532.14nm,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 1.6μm solid-state lasers.The laser was used to pump Er:YAG nonplanar ring cavity to obtain 1.3W single frequency laser output,and the slope efficiency was 31.76%.