光子学报, 2017, 46 (8): 0823004, 网络出版: 2017-10-30
环形腔2.05 μm单谐振KTP晶体光参量振荡器研究
Investigation on Ring-Cavity 2.05 μm Single Resonant KTP Crystal Optical Parametric Oscillator
非线性光学 光参量振荡器 环形腔 2 μm激光器 KTP晶体 Nonlinear optic Optical parametric oscillator Ring cavity 2μm laser KTP crystal
摘要
针对大气CO2浓度探测差分吸收激光雷达的应用需求,采用稳定环形腔和模式匹配设计,搭建了一套单纵模1 064 nm激光泵浦的单谐振KTP晶体光参量振荡器,获得高斜率转换效率、基横模的2.05 μm波长纳秒激光脉冲输出.在8字形环形行波稳定腔中,将2块II类相位匹配KTP晶体以走离补偿方式放置,在20 Hz重复频率下,当泵浦单脉冲能量达到11 mJ时,获得了单脉冲能量为2.4 mJ的2.05 μm信号光输出,脉宽约24 ns,斜率效率达到53%.2.05 μm信号光光束质量因子在x、y方向分别为1.3和1.2.
Abstract
Based on the application requirements of differential absorption lidar for atmospheric CO2 concentration detection, a single-resonant KTP crystal optical parametric oscillator, pumped by a 1 064 nm single-longitudinal-mode laser, was built with stable ring-cavity and mode matching design, and nanosecond laser pulse output at 2.05 μm wavelength was achieved with high slope conversion efficiency. In the stable ring cavity with a bow-tie configuration, two KTP crystals with type II phase-match condition cut were placed in walk-off-compensated arrangement. When the pump pulse energy reached 11 mJ at a repetition rate of 20 Hz, 2.4 mJ of laser pulse energy output at 2.05 μm signal wavelength was obtained with pulse width of around 24 ns, and the corresponding slope efficiency was 53%. The 2.05 μm signal laser beam quality factor in x and y directions were 1.3 and 1.2 respectively.
谢小兵, 李世光, 朱小磊, 马秀华, 董怡静, 谢伟. 环形腔2.05 μm单谐振KTP晶体光参量振荡器研究[J]. 光子学报, 2017, 46(8): 0823004. XIE Xiao-bing, LI Shi-guang, ZHU Xiao-lei, MA Xiu-hua, DONG Yi-jing, XIE Wei. Investigation on Ring-Cavity 2.05 μm Single Resonant KTP Crystal Optical Parametric Oscillator[J]. ACTA PHOTONICA SINICA, 2017, 46(8): 0823004.