Mid-infrared optical parametric oscillator based on ZnGeP_2 pumped by 2-μm laser

• 作 者: 彭跃峰 魏星斌 王卫民
• 机 构: Institute of Applied Electronics, China Academy of Engineering Physics,
• 出 处: Chinese Optics Letters
• 发表日期: 2011年06期
• 关键词: pumped oscillator m laser tuning match coated parametric polarized fitting match

We present a 3 5 μ m optical parametric oscillator (OPO) based on ZGP pumped by KTP OPO 2.1-μ m laser. The tuning curves of ZGP OPO are calculated. The 8 ×6 ×18 (mm) ZGP crystal, whose end faces are antireflection coated at 2.1 and 3.7 4.6 μ m, is cut as θ =53.5°, φ =0°. When the pump power of 2.1-μ m 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 μ m, respectively. Pulse duration is about 27 ns. Beam quality factor M 2 is better than 1.8. The tunability of 3 5 μ m can be achieved by changing the angle of the ZGP crystal.

The tuning curves of ZGP OPO are calculated. The 8 × 6 × 18 (mm) ZGP crystal, whose end faces is a 3.5 μm pitch parametric oscillator (OPO) based on ZGP pumped by KTP OPO 2.1-μm laser. are antireflection coated at 2.1 and 3.7 4.6 μ m and are cut as θ = 53.5 ° and φ = 0 °. When the pump power of 2.1-μ m polarized laser is 15 W at 8 kHz, 5.7-W output power and 46.6% The slope wavelengths are about 27 ns. Beam quality factors M 2 is better than 1.8. The tunability of 3 5 μ m can be achieved by changing the angle of the ZGP crystal.