2 μm Tm,Ho∶YLF激光抽运ZnGeP<sub>2</sub>光参量振荡技术研究

姚宝权; 贺万骏; 李玉峰; 张兴宝; 鞠有伦; 王月珠

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

论文大纲

姚宝权 ^*贺万骏李玉峰张兴宝鞠有伦王月珠

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

激光技术光参量振荡器相位匹配 ZnGeP2晶体 laser technique optical parametric oscillator phase matching ZnGeP2 crystal Tm Tm Ho Ho∶YLF crystal

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.

参考文献

[1] . A. Budni, L. A. Pomeranz, M. L. Lemons et al.. 10 W mid-IR Holmium pumped ZnGeP2 OPO[J]. Advanced Solid-State Lasers, OSA Trends in Optics and Photonics Series, 1998, 19: 226-229.

[2] . B. Phua, K. S. Lai, R. F. Wu. Coupled tandem optical parametric oscillator (OPO): an OPO within an OPO[J]. Opt. Lett., 1998, 23(16): 1262-1264.

[3] . H. Allik, S. Chandra, D. M. Rines et al.. Tunable 7-12 μm optical parametric oscillator using a Cr,Er∶YSGG laser to pump CdSe and ZnGeP2 crystals[J]. Opt. Lett., 1997, 22(9): 597-599.

[4] . Cheung, S. Palese, H. Injeyan et al.. High power conversion to mid-IR using KTP and ZGP OPO[J]. Advanced Solid-State Lasers, Trends in Optics and Photonics Series, 1999, 26: 514-517.

[5] E. Cheung, S. Palese, H. Injeyan et al.. High power optical parametric oscillator source [C]. IEEE Aerospace Conference Proceedings, 2000, 3:55～59

[6] Huang Jinzhe, Ren Deming, Zhang Lili et al.. Experimental research on the second harmonic generation of TEA CO2 laser in AgCaSe2 crystal [J]. Chinese J. Lasers, 2004, 31(5):559～562
黄金哲,任德明,张莉莉等. TEA CO2激光在AgCaSe2晶体中的倍频实验研究[J]. 中国激光, 2004, 31(5):559～562

[7] . Chandra, T. H. Allik, G. Catella et al.. Continuously tunable, 6-14 μm silver-gallium selenide optical parametric oscillator pumped at 1.57 μm[J]. Appl. Phys. Lett., 1997, 71(5): 584-586.

[8] . A. Budni, M. G. Knights, E. P. Chicklis et al.. Kilohertz AgGaSe2 optical parametric oscillator pumped at 2 μm[J]. Opt. Lett., 1993, 18(13): 1068-1070.

[9] . Komine, J. M. Fukumoto. Noncritically phase matched mid-infrared generation in AgGaSe2[J]. IEEE J. Sel. Top. Quantum Electron., 1995, 1(1): 44-49.

[10] R. K. Shori, O. M. Stafsudd. High energy AgGaSe2 optical parametric oscillator operating in 5.7～7 μm region [C]. CLEO, 2000. 179～181

[11] T. Schroder. Two-stage nanosecond OPO based on LiNbO3 and AgGaSe2 tunable from 3～6 μm [C]. CLEO, 2001. 450～451

[12] . Ghosh. Sellmeier coefficients for the birefringence and refractive indices of ZnGeP2 nonlinear crystal at different temperatures[J]. Appl. Opt., 1998, 37(7): 1205-1212.

[13] Yuezhu Wang, Xingbao Zhang, Baoquan Yao et al.. Fiber-coupled diode end-pumped Q-switched Tm, Ho:YLiF4 laser [J]. Chin. Opt. Lett., 2004, 2(6):337～338

[14] Yuezhu Wang, Xinlu Zhang, Baoquan Yao et al.. Performance of a liquid-nitrogen-cooled CW Tm, Ho∶YLF laser [J]. Chin. Opt. Lett., 2003, 1(5):281～282

[15] Yao Baoquan, Dong Liqiang, Wang Yuezhu et al.. Experimental study of microchip (Tm,Ho)∶YLF laser pumped by laser diode [J]. Acta Optica Sinica, 2004, 24(1):79～83
姚宝权,董力强,王月珠等. 激光二极管抽运(Tm,Ho)∶YLF微片激光器的实验研究[J]. 光学学报, 2004, 24(1):79～83

[16] Yao Baoquan, Wang Qi, Wang Yuezhu et al.. Experimental study of (Tm,Ho)∶YLF microchip laser [J]. Acta Optica Sinica, 2002, 22(10):1216～1218
姚宝权,王骐,王月珠等. (Tm,Ho)∶YLF微片激光器的实验研究[J]. 光学学报, 2002, 22(10):1216～1218

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.

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

关于本站 Cookie 的使用提示

全站搜索

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

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索

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