级联Nd:GdVO4自拉曼1309nm激光性能研究

Study on the performance of cascaded Nd:GdVO4 self-Raman laser at 1309nm

报道了基于半导体激光端面抽运的a切Nd:GdVO4晶体级联自拉曼激光的输出特性。利用Nd:GdVO4晶体的优异激光特性和较强的拉曼增益,结合使用针对级联拉曼设计的宽带高反腔镜,在声光Q开光调制下,成功实现了基于882 cm^-1频移的1309 nm波长二阶斯托克斯激光输出。在10W入射抽运功率和50 kHz重复频率下,获得了平均输出功率1.48 W,脉冲宽度5.3 ns的1309 nm激光输出,对应的二阶斯托克斯激光阈值和光光转换效率分别为5.9 W和14.8%。结果表明:以Nd:GdVO4作为自拉曼晶体,通过级联拉曼可实现高效二阶斯托克斯激光输出,对丰富固体激光波长具有重要价值。

The output characteristics of a-cut Nd:GdVO4 crystal cascaded self-Raman laser based on semiconductor laser end-pumping were reported.Making full use of the excellent laser characteristics and strong Raman gain of Nd:GdVO4 crystal,as well as using broadband high-reflection mirror designed for cascaded Raman operation,second order Stokes laser at 1309 nm based on the Raman shift of 882 cm^-1 was successfully achieved under the acousto-optic Q-switched modulation.Under the incident pump power of 10W and the pulse repetition frequency of 50 k Hz,a maximum average Raman laser output power of 1.48 W and a pulse width of 5.3 ns for 1309 nm laser was obtained,corresponding the threshold and the conversion efficiency for second order Stokes generation were around 5.9 W and 14.8%,respectively.The results show that cascaded Nd:GdVO4 self-Raman also can achieve high-efficiency second-Stokes laser output,which is of great value to enrich the wavelength of solid-state laser.