双端抽运的30 W光纤激光器实验研究

报道了双端抽运连续输出的掺Yb^3 双包层高功率光纤激光器。实验采用了中心波长在975nm附近的两种输出形式的半导体激光器(LD)作为抽运源，测量了不同抽运条件下的输出功率特性和光谱特性。在仅尾纤输出的半导体激光器抽运下获得了斜率效率为42％，峰值波长为1103．8nm的9．2W激光输出；在仅准直输出的半导体激光器抽运下获得了斜率效率为57％，峰值波长为1104．4nm的20．0W激光输出；当两个半导体激光器在双端同时抽运时，获得光纤激光最大输出功率为30．6W，输出峰值波长为1108．4nm，以及49％的总体光一光转换效率。

Experimental Study of 30 W CW Fiber Laser by Two-End Pumping

A two-end pumping high power continuous-wave (CW) Yb 3+-doped double-clad fiber laser was reported. In experiments, two types of laser diodes with center wavelength around 975 nm were adopted as pumping sources, and the characteristics of output power and laser spectrum were measured under different pumping conditions. Under the pumping of the pigtailed laser diode, output power was 9.2 W, slope efficiency was 42% and laser peak spectrum was 1103.8 nm. Under the pumping of the collimated laser diode, output power was 20.0 W, slope efficiency was 57% and laser peak spectrum was 1104.4 nm. When both laser diodes were used to pump the fiber laser together, the maximum output power of 30.6 W, laser peak spectrum of 1108.4 nm and total optical-to-optical efficiency of 49% were achieved.