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以Cr:YAG作为饱和吸收体,利用a向切割的Nd:GdVO4晶体的自受激拉曼散射效应,实现了结构紧凑的1 173nm拉曼激光器的调Q锁模输出。Nd:GdVO4晶体长度为10mm,Nd3+离子掺杂浓度为0.2%;Gr:YAG晶体的初始透过率为70%。激光器为LD端面泵浦,折叠腔结构,并且采用了透过率为10%的输出镜。泵浦功率5W时激光开始振荡输出。锁模脉冲重复频率高达900MHz;在最高泵浦功率时,1 173nm激光平均输出功率为180mW,调Q包络宽度为11ns。同时,利用10mm长的Ⅰ类匹配LBO作倍频晶体,成功实现了锁模黄光的输出,输出平均功率为10mW。并对586.5nm脉冲黄光的光谱进行了测量。激光器设计合理,热效应对激光器的影响被有效抑制。
Using the Cr: YAG as a saturable absorber, a Q-switched mode-locked output of a compact 1 173 nm Raman laser is achieved by utilizing the self-stimulating Raman scattering effect of a-cut Nd: GdVO4 crystals. Nd: GdVO4 crystal length of 10mm, Nd3 + ion doping concentration of 0.2%; Gr: YAG crystal initial transmittance of 70%. The laser is an LD end-pumped, folded cavity structure and employs an output mirror with a 10% transmission. When the pump power 5W laser oscillation output. The mode-locked pulse repetition frequency is up to 900MHz. At the highest pump power, the average output power of the 1 173nm laser is 180mW and the Q-switched envelope width is 11ns. At the same time, the output of mode-locked yellow light was successfully achieved by using a 10mm long class-I matched LBO as the frequency-doubling crystal. The average output power was 10mW. The spectrum of 586.5 nm pulsed yellow light was measured. Laser design is reasonable, the impact of thermal effects on the laser is effectively suppressed.