High Energy Dual-Wavelength Mid-Infrared Extracavity KTA Optical Parametric Oscillator

A high energy dual-wavelength extracavity KTA optical parametric oscillator (OPO) with excellent stability and beam quality, which is pumped by a Q-switched single-longitudinal-mode Nd:YAG laser, has been demonstrated based on a type II noncritical phase matching (NCPM) KTA crystal. The maximum pulse energy of 10.2 mJ with the output stability of better than 4.1% rms at 3.467 μm is obtained at the repetition rate of 10 Hz and pulse width of 2 ns, and the 11.9 mJ of 1.535 μm radiation is obtained simultaneously. This extracavity NCPM KTA OPO is very useful when high energy, high beam quality and smooth time domain are needed.

Authors:

• Hongjun Liu
• Qibing Sun
• Nan Huang
• Shaolan Zhu
• Wei Zhao

Keywords:

• mid-infrared laser
• OPO
• dual-wavelength laser

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