论文部分内容阅读
为了实现固体激光器高功率、高光束质量的输出,设计了一种激光二极管(LD)阵列抽运的主振荡级与功率放大器(MOPA)结构的Nd∶YVO4激光器。该激光器的振荡级采用平-平谐振腔结构,并使用棱镜组对激光二极管阵列的抽运光整形,消除了激光二极管阵列抽运光不对称对振荡器输出光束质量的影响,在连续工作条件下获得了6.1 W的激光输出,其光束质量M2因子为M2x=1.14,M2y=1.13,光-光转换效率为25.6%。放大级采用具有近共焦、非稳腔特点的折叠光路结构,使振荡级激光光束10次通过放大级晶体,并且有效地抑制了放大自发辐射(ASE)和寄生振荡。在振荡级以6.1 W注入放大器时,得到最大输出功率26.8 W,此时放大器提取效率为29.1%,输出光束质量M2因子为M2x=2.08,M2y=1.92。
In order to realize the output of high power and high beam quality of solid state laser, a Nd: YVO4 laser with main oscillation stage and power amplifier (MOPA) structure of laser diode (LD) array pump was designed. The oscillation level of the laser uses a flat-resonant cavity structure, and uses the prism group to pump laser light shaping of the laser diode array, which eliminates the influence of the laser diode array pumping light asymmetry on the output beam quality of the oscillator. Under the continuous working condition The laser output of 6.1 W was obtained with a M2 factor of M2x of 1.14, a M2y of 1.13 and a light-to-light conversion efficiency of 25.6%. The enlarged stage adopts a folded optical path structure with nearly confocal and unstable cavity characteristics. The oscillating laser beam passes through the amplifying stage 10 times and effectively inhibits the amplification of spontaneous emission (ASE) and parasitic oscillation. The maximum output power of 26.8 W was obtained when the amplifier was injected at 6.1 W in the oscillation stage. The amplifier extraction efficiency was 29.1%. The M2 factor of the output beam was M2x = 2.08 and M2y = 1.92.