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Phase-matched DAST DFG THz-wave generation using independently controllable dual wavelength light source

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4 Author(s)
Miyamoto, K. ; Tera-photonics Lab., RIKEN Sendai, Sendai ; Nawahara, A. ; Yamashita, T. ; Ito, H.

We report on the demonstration of an effective and widely tunable terahertz (THz)-wave generation using difference frequency generation (DFG) in an organic 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) by optimization of the pumping wavelength. We calculated the Type 0 phase-matching condition of DAST-DFG THz-wave generation over an ultrawide band (1.5-20 THz). A dual-wavelength optical parametric oscillator (OPO) with two KTP crystals mounted on a galvano scanner was constructed. To satisfy phase-matching conditions over the whole THz-wave region, pump wavelengths lambda1 and lambda2 were controlled independently from 1.25 to 1.6 mum. A comparison of the calculated and experimental results established the optimum phase-matching condition of DAST-DFG.

Published in:

Infrared and Millimeter Waves, 2007 and the 2007 15th International Conference on Terahertz Electronics. IRMMW-THz. Joint 32nd International Conference on

Date of Conference:

2-9 Sept. 2007