Mid-infrared optical parametric oscillator based on ZnGeP2 pumped by 2-μm laser

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2011,（6）
• 页码范围: 67-69
• 页数: 3页
• 语种: 英文
• DOI: 10.3788/COL201109.061403.

摘要

We present a 3-5 μm optical parametric oscillator (OPO) based on ZGP pumped by KTP OPO 2.1-μm laser.The tuning curves of ZGP OPO are calculated.The 8 ×6 ×18 (mm) ZGP crystal, whose end faces are antirefiection coated at 2.1 and 3.7-4.6 μm, is cut as θ=53.5°, φ=0°.When the pump power of 2.1-μm polarized laser is 15 W at 8 kHz, 5.7-W output power and 46.6% slope efficiency are obtained with a ZGP type Ⅰ phase match.Central wavelengths of the signal and idler lasers are 4.10 and 4.32 μm, respectively.Pulse duration is about 27 ns.Beam quality factor M2 is better than 1.8.The tunability of 3-5 μm can be achieved by changing the angle of the ZGP crystal.