高效新型自倍频Yb：GdYAB激光器的理论和实验研究

Theoretic Analyses and Experimental Studies on a Novel Compact and High Efficient Self-Frequency-Doubled Yb∶GdYAB Laser

通过研究自倍频现象的物理过程,理论推导了自倍频激光器输出功率的表达式,分析了影响自倍频激光器高效运转的具体参量.研究发现,除了晶体自身的性质外,在具体实验中晶体放置的位置、角度以及晶体的温度等,都不同程度地影响着自倍频激光器的输出功率.在此基础上,实现了LD端面泵浦的新型Yb∶GdYAB自倍频激光器运转,当晶体吸收功率为2.56W时,获得了总功率为441mW的自倍频绿光输出,从二极管到绿光的光-光转换效率达到了17.2%,并具有较好的功率稳定性和模式.

A resulting expression for the output power of a self-frequency-doubled （SFD） laser was derived from the investigation of the SFD process. The parameters of influence on the efficiency of SFD were analyzed. The output power of a SFD laser can be imposed in a experiment by the position, angle and temperature of the crystal besides its inherent properties. According to the theory,a laser diode （LD） end- pumped highly efficiency SFD Yb ： GdYAB laser has been achivered. A maximum output power of green laser of 441 mW was obtained while the pump power was 2.56 W,corresponding to a conversion efficiency of 17.2% from LD to green laser. The SFD green laser had a good operative stability and a TM00 mode.