Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 100, Issue 4, Pages 749-753Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-010-3932-y
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Funding
- National Basic Research Programme of China [2007CB310403]
- Research Fund for the Doctoral Programme of Higher Education [20070420118]
- National Natural Science Foundation of China [60801017]
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A high-energy, high-efficiency mid-infrared KTA OPO at 3.47 mu m intracavity pumped by a Nd:YAG laser is presented. The maximum output energy is 31 mJ at the repetition rate of 10 Hz with a V-shaped cavity, corresponding to the absolute optical-to-optical conversion efficiency of 4.76% from the diode and the photon conversion efficiency of 87% from the fundamental to mid-infrared energy. The pulse width is 5.8 ns at the maximum output energy and the peak power reaches higher than 5 MW. The line width of the mid-infrared wave is about 1.1 nm (or 0.9 cm(-1) in wave number). The output energy demonstrates good stability. To our knowledge, these are the highest pulse energy and conversion efficiency of mid-infrared OPOs using bulk nonlinear crystals in the 3-5 mu m range.
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