纳秒电光调QNd:YVO_4激光器

Nanosecond electro-optically Q-switched Nd:YVO_4 laser

介绍了一种新颖的短腔电光调Q窄脉宽激光器,通过分析影响脉宽的主要因素,确定了激光器的结构及参数。在准连续端面泵浦条件下,采用掺杂原子分数为1.0%、沿a轴切成布儒斯特角的Nd:YVO4晶体作为增益介质,直接获得偏振光振荡,有效缩短了腔长。在物理腔长20mm时,采用退压式电光主动调Q结构,减小了插入损耗,获得了脉冲宽度为1.049ns、单脉冲能量为0.32mJ、光束质量平方因子为1.9的稳定激光输出。

A novel electro-optically Q-switched laser with short cavity was demonstrated.Its optimal structure parameters were determined via the analysis of factors related to output pulse width.Quasi-continuous end-pumped Nd：YVO4 crystal with concentration of 1.0 % was cut along Brewster angle in a-axis,in order to ensure polarized oscillation.Thus,the cavity length was shortened efficiently due to the omission of quarter wave plate in voltage-decreased Q-switching structure.In condition of 20 mm physical cavity length,the narrowest output pulse width of 1.049 ns,pulse energy of 0.32 mJ and beam quality factor of 1.9 were achieved.