掺钕保偏光纤激光器腔内倍频实验研究

从双包层光纤激光器的速率方程和光传输方程出发,数值模拟得到泵浦功率20 W时最佳增益光纤长度。在此基础上,采用线型直腔结构,通过透镜耦合的方式,用808 nm半导体激光器对掺Nd3+熊猫型保偏双包层光纤进行端面泵浦,获得1060 nm连续偏振的基频光输出,其线宽小于5 nm,光-光转换效率达到50%;之后,采用腔内插入KTP晶体的方式对基频光进行倍频获得530 nm的绿光输出,其线宽小于3 nm,倍频效率达到20%。在20 W的入纤功率泵浦下,得到2 W的530 nm连续绿光输出。

Research of intra cavity frequency doubling of Nd3＋-doped fiber laser

Departure from the double-clad fiber laser rate equations and optical transmission equation, numerical simulation has been the best gain fiber length when the pump power of 20 W. Experiments with linear straight cavity structure, through the lens cou-pled end-pumped neodymium-doped panda type polarization maintaining double-clad fiber, experiments has obtain the fundamental frequency of cw1060 nm polarization maintaining light output, the line is less than 3 nm, light- light conversion efficiency reached 50%. Then, put a KTP crystal into the cavity to achieve frequency doubling , obtain cw 530 nm polarization maintaining green laser, its line width is less than 2 nm, SHG efficiency reached 20%. The whole system-optical conversion efficiency is 10%.The power of 530 nm green light can reach 2 W, when launched power is 20W.