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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。
In the 4F3 / 2-4I13 / 2 transition band of Nd: YVO4 crystal, except for the 1342 nm laser radiation, the other transition lines are hard to form laser oscillation due to the small stimulated emission cross section and strong parasitic oscillation. By adjusting the cavity loss, a fiber coupled laser diode end-pumped 1386 nm Nd: YVO4 laser with continuous laser output was obtained. At pumping power of 4.24 W, 305 mW continuous laser output at 1386 nm was achieved, with a ramp efficiency of 13.9% at the highest output power. The experiments also observed dual-wavelength operation at 1342 nm and 1386 nm. According to the pumping threshold energy and the experimental data, the stimulated emission cross section at 1386 nm laser radiation in Nd:YVO4 crystal is calculated to be about (3 ± 1) × 10-19cm2.