激光二极管端面抽运Nd∶YVO_4实现1386nm连续波激光输出

1386 nm Continuous Wave Output from Laser Diode End-Pumped 1386 nm Nd∶YVO_4 Laser

在Nd:YVO4晶体的4F3/2-4I13/2跃迁带内,除了1342 nm激光辐射之外,其它的跃迁谱线由于小的受激发射截面和强的寄生振荡,很难形成激光振荡。通过调整谐振腔损耗,获得了光纤耦合激光二极管端面抽运1386 nmNd∶YVO4激光器激光连续输出。在抽运功率达到4.24 W时,得到了305 mW的1386 nm激光连续输出,最高输出功率下的斜效率为13.9%。实验中还观察到了1342 nm和1386 nm的双波长运转。根据抽运阈值能量和实验数据,计算得到了Nd∶YVO4晶体中1386 nm激光辐射处的受激发射截面大约为(3±1)×10-19cm2。

Transition spectra in the ^4F3/2^4I13/2 transition band of Nd： YVO4 crystal are too weak to form laser oscillation for the small stimulated emission cross section and strong parasitical oscillation, except for the 1342 nm wavelength. By adjusting the loss of the resonant cavity, 1386 nm continuous wave output from fiber coupled laser diode end-pumped Nd： YVO4 laser is achieved, which reaches 305 mW with pump power of 4.24 W, and the slope efficiency is 13.9% with the highest output power. Continuous wave outputs of 1342 nm and 1386 nm are also observed in the experiment. The stimulated emission cross section of Nd, YVO4 crystal at the wavelength of 1386 nm is calculated as about （3±1）×10^-19 cm^2 , according to the pumping threshold energy and experimental data.