中国激光, 2005, 32 (1): 39, 网络出版: 2006-06-01   

2 μm Tm,Ho∶YLF激光抽运ZnGeP2光参量振荡技术研究 下载: 533次

Technical Study of ZnGeP2 Optical Parametric Oscillator Pumped by a 2 μm Tm,Ho∶YLF Laser
作者单位
哈尔滨工业大学可调谐激光技术国家级重点实验室, 黑龙江 哈尔滨 150001
摘要
ZnGeP2晶体具有宽的透明范围(0.7~12 μm),较大的非线性系数(d36=75 pm/V),最高损伤阈值能量密度为10 J/cm2,较高的热导率(0.18 W/(m?K)),因而非常适合作为高功率中红外光参量振荡器(OPO)晶体。理论上分析了ZnGeP2 光参量振荡器相位匹配特性,实现3~5 μm连续调谐范围输出的Ⅰ类相位匹配角在52.5~55.2°之间。实验上,以15 W光纤耦合激光二极管(LD)抽运的2.05 μm高重复频率声光调Q Tm,Ho∶YLF激光器作为抽运源,其最大平均功率4 W,脉冲宽度小于40 ns, 脉冲重复频率100 Hz~10 kHz可调。为降低准三能级系统激光器阈值,提高激光脉冲能量抽取效率,Tm,Ho∶YLF晶体采用液氮制冷方式,工作在77 K温度条件下。非线性频率转换晶体ZnGeP2长15 mm,55.7°切割,光参量振荡器谐振腔为平平腔,腔长约20 mm。在3.6 W的抽运功率下,脉冲重复频率10 kHz,实现了4.1 μm附近中红外激光输出,参量光脉冲宽度为20 ns,平均输出功率为0.7 W,光-光转换效率为20%,抽运光阈值功率为0.65 W。
Abstract
ZnGeP2 crystal with high nonlinear coefficient (d36=75 pm/V), broad infrared transmission region (0.7~12 μm) and very high thermal conductivity (0.18 W/(m?K)) is very suitable for high power mid-infrared radiation generation. Phase matching characteristics of ZnGeP2 optical parametric oscillator (OPO) are analyzed theoretically, the requirement of type Ⅰ phase matching angle of 52.5~55.2° must be met to achieve continuously tuning of 3~5 μm. Experimentally, the acousto-optic Q-switched Tm, Ho∶YLF laser end pumped by fiber-coupled diode is employed as the pumping source of OPO with the maximum average power of 4 W, pulse duration of less than 40 ns, and pulse repetition rate of 100~10000 Hz. For higher extraction efficiency and low threshold operation to the quasi-three level laser system, the Tm,Ho∶YLF crystal is cooled by liquid nitrogen reserved in a small detector type dewar, and works at the temperature of 77 K. The 15-mm-long, 55.7° cut ZnGeP2 as a frequency converting crystal was placed in a plano-plano cavity with resonator length of 20 mm. Under a pumping power of 3.6 W and pulse repetition rate of 10 kHz, the mid-infrared coherent radiation of OPO near 4.1 μm was achieved with output power of 0.7 W, pulse width of 20 ns, optical-optical conversion efficiency of 20% and threshold pump power of 0.65 W.

姚宝权, 贺万骏, 李玉峰, 张兴宝, 鞠有伦, 王月珠. 2 μm Tm,Ho∶YLF激光抽运ZnGeP2光参量振荡技术研究[J]. 中国激光, 2005, 32(1): 39. 姚宝权, 贺万骏, 李玉峰, 张兴宝, 鞠有伦, 王月珠. Technical Study of ZnGeP2 Optical Parametric Oscillator Pumped by a 2 μm Tm,Ho∶YLF Laser[J]. Chinese Journal of Lasers, 2005, 32(1): 39.

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