1.2 W中红外ZnGeP2光参量振荡器
1.2 W ZnGeP2 optical parametric oscillator
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摘要: 报导了利用Tm,Ho:GdVO4激光器抽运双谐振ZnGeP2光参量振荡器实验研究。Tm(5%),Ho(0.5%):GdVO4晶体采用液氮制冷方式，工作在77 K温度条件下。以25 W波长为800 nm的光纤耦合激光二极管抽运，2 μm激光最大平均功率7 W，脉冲宽度小于30 ns， 脉冲重复频率5 kHz到20 kHz可调。非线性频率转换晶体ZnGeP2长15 mm，55°切割，OPO谐振腔为平平腔，腔长约25 mm。在5 W的2 μm激光抽运下,脉冲重复频率10 kHz，实现了信号光3.7 μm及闲频光4.5 μm中红外激光输出，参量光脉冲宽度为15~17 ns，最大平均功率大于1.2 W，光-光转换效率为20%。测量参量光输出光束全宽度远场发散角4 mrad，光束质量M 2因子小于3。
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关键词:
- 光参量振荡器 /
- ZnGeP2 /
- Tm /
- Ho:GdVO4激光器
Abstract: A doubly resonant ZnGeP2 (ZGP) optical parametric oscillator pumped by a Tm,Ho:GdVO4 laser is investigated. High pulse repetition frequency of 10 kHz cryogenic Tm(5%),Ho(0.5%):GdVO4 laser at 2.05 μm was utilized as pumping source for ZnGeP2 OPO. The stable pulse train with duration of 23 ns was achieved from Tm,Ho:GdVO4 laser pumped by a continuous wave fiber-coupled laser diode at 801 nm. The GdVO4 host exhibited good thermo-optical property, experiencing greater than 12 kW/cm2 pump density. The ZGP OPO generated a total combined output of 1.2 W at 3.75 μm and 4.52 μm under pumping power of 5.3 W, corresponding conversion efficiency of 23% from incident 2 μm laser power to mid-IR output.-
Key words:
- optical parametric oscillator /
- zngep2 /
- tm /
- ho:gdvo4 laser
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