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4 November 2010 Terahertz difference frequency generation in GaSe from a doubly-resonant walk-off compensated KTP OPO
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Abstract
We have achieved a Terahertz (THz) DFG system based on a walk-off compensated intracavity pumped dualwavelength KTP OPO employing two identical KTP crystals. The KTP OPO is doubly resonant and works near the degenerate point at 2.128μm, which doubles the quantum efficiency compared with DFG using pump pulses around 1μm. This THz source is simple and compact, about 10×10×40cm2 in size. Besides lower threshold and better stability, the walk-off compensated KTP OPO greatly improves the pump beam quality and enhances the DFG conversion efficiency. With an 8-mm-long GaSe crystal, the generated THz tuning range is from 0.186THz to 3.7THz with the maximum output voltage of 489V on the bolometer at 1.68THz. An average enhancement of 76.7% for the THz energies is realized using the walk-off compensated KTP OPO than a common one. The conversion efficiency can be improved with a longer and better GaSe crystal.
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Kai Zhong, Jianquan Yao, Degang Xu, and Peng Wang "Terahertz difference frequency generation in GaSe from a doubly-resonant walk-off compensated KTP OPO", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78543D (4 November 2010); https://doi.org/10.1117/12.868565
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