光学学报, 2019, 39 (11): 1114002, 网络出版: 2019-11-06
纳秒中红外可调谐参量激光研究 下载: 1019次
Nanosecond Mid-Infrared Tunable Parametric Laser
激光光学 中红外 可调谐激光 光参量 光束质量 纳秒脉冲 laser optics mid-infrared tunable laser optical parameter beam quality nanosecond pulse
摘要
中红外可调谐激光已被广泛应用于医疗、**,以及环保等领域。利用1064 nm激光抽运磷酸钛氧钾(KTP)晶体光参量振荡器(OPO)产生2.6 μm波长可调谐参量激光。该光参量振荡器采用腔外单谐振结构,利用Ⅱ类相位匹配的方式获得了最大的非线性系数。实验实现了2.4~2.8 μm的波长调谐范围,并在155 mJ泵浦能量下,获得了最大单脉冲能量为12.6 mJ、转化效率为8.1%、光束质量为5倍的衍射极限。
Abstract
Mid-infrared tunable laser is widely used in several fields, such as medical, military, and environmental protection. Herein, a tunable parametric laser with a central wavelength of 2.6 μm is generated by pumping a KTP crystal based optical parametric oscillator (OPO). The OPO employs an extra-cavity single resonance structure. Type-II phase matching is used to obtain a maximum nonlinear coefficient. Experimental results demonstrate that the wavelength of the oscillator can be adjusted in the range of 2.4-2.8 μm. The maximum pulse energy is 12.6 mJ with a pumping energy of 155 mJ, whereas the conversion efficiency is 8.1%. The beam quality is measured to be five-fold of the diffraction limit.
李浩宁, 张大成, 朱江峰, 田文龙, 刘寒, 康仁铸, 魏志义. 纳秒中红外可调谐参量激光研究[J]. 光学学报, 2019, 39(11): 1114002. Haoning Li, Dacheng Zhang, Jiangfeng Zhu, Wenlong Tian, Han Liu, Renzhu Kang, Zhiyi Wei. Nanosecond Mid-Infrared Tunable Parametric Laser[J]. Acta Optica Sinica, 2019, 39(11): 1114002.