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提出了一种基于光谱色散原理调节激光相干长度的固体激光器。采用传统色散元件(光栅和多块三角棱镜)组成相干长度调节模块,通过将其置于激光谐振腔内代替一面腔镜,利用棱镜的扩束特性和光栅的色散特性实现对激光相干长度的连续调节。以Nd…YAG晶体作为增益介质,搭建激光谐振腔,进行了相干长度调节实验,得到了功率稳定性小于0.5%,相干长度调节范围为10~50cm的1064nm输出激光。理论及实验结果验证了输出激光的相干长度与调节模块中棱镜组的扩束倍率存在良好的线性关系。
A new type of solid-state laser based on the principle of spectral dispersion is proposed. Using the traditional dispersive element (grating and triangular prism) to form the coherence length adjustment module, by placing it in the laser resonator instead of a cavity mirror, the use of the prism beam expander characteristics and grating dispersion characteristics to achieve a continuous laser coherence length adjust. Nd: YAG crystal as the gain medium, a laser resonator was set up and coherent length adjustment experiments were carried out. The 1064nm output laser with the power stability of less than 0.5% and the coherence length of 10 ~ 50cm was obtained. The theoretical and experimental results show that there is a good linear relationship between the coherent length of the output laser and the beam expander magnification of the prism group in the adjustment module.