中国激光, 2020, 47 (3): 0301011, 网络出版: 2020-03-12   

基于楔形Nd∶YVO4/KTP双折射滤波的单频绿光激光器 下载: 1224次

Single-Frequency Green Laser Based on Birefringent Filter Comprising a Wedge Nd∶YVO4/KTP
作者单位
1 北京交通大学理学院, 北京 100044
2 中国科学院光电研究院计算光学成像技术重点实验室, 北京 100094
3 中国科学院大学, 北京 100049
摘要
通过研究双折射晶体Nd∶YVO4的偏振特性,利用楔角为10°的Nd∶YVO4激光晶体和倍频晶体KTP(磷酸钛氧钾)在绿光激光器中构造了一个新型双折射滤波器。理论分析了KTP晶体的长度、基频光在KTP中的入射角度和KTP的温度对双折射滤波器选频的影响。实验中使用长度为4.4,5,7 mm的KTP,采用V型腔结构,最后分别获得了90,120,104 mW的单频绿光。实验结果表明,由楔形Nd∶YVO4和KTP构成的双折射滤波器成功实现了激光单纵模运转,且方法简单易行。当KTP晶体长度为5 mm时,测得楔形Nd∶YVO4/KTP激光器的单纵模运转温度范围约为5 ℃。
Abstract
By studying the polarization characteristics of the birefringent Nd∶YVO4 crystal, a novel birefringent filter comprising an Nd∶YVO4 laser crystal with a wedge angle of 10° and a frequency doubling KTP (potassium titanyl phosphate) crystal is constructed in a green laser. The influences of the KTP length, incident angle of the fundamental mode in the KTP, and KTP temperature on the electing-mode function of the birefringence filter are theoretically analyzed. In the experiment, KTP crystal with lengths of 4.4, 5, and 7 mm and containing V-cavity structures are used, and 90-, 120-, 104-mW single-frequency green light is obtained, respectively. Experimental results prove that the birefringence filter comprising a wedge Nd∶YVO4 and KTP can successfully realize laser single-longitudinal-mode operation. Further, the proposed method is simple and easy. For 5-mm KTP length, the single-longitudinal-mode operating temperature range of the wedge Nd∶YVO4/KTP laser is measured to be approximately 5 ℃.

高志红, 张文喜, 郭晓丽, 赵亚帅, 伍洲, 颜博霞, 亓岩, 冯其波. 基于楔形Nd∶YVO4/KTP双折射滤波的单频绿光激光器[J]. 中国激光, 2020, 47(3): 0301011. Gao Zhihong, Zhang Wenxi, Guo Xiaoli, Zhao Yashuai, Wu Zhou, Yan Boxia, Qi Yan, Feng Qibo. Single-Frequency Green Laser Based on Birefringent Filter Comprising a Wedge Nd∶YVO4/KTP[J]. Chinese Journal of Lasers, 2020, 47(3): 0301011.

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