Abstract-Simultaneous Generation of Two Pairs of Stokes and Terahertz Waves from Coupled Optical Parametric Oscillations with Quasi-Phase-Matching

Bin Yuan, Lian Tan, Mengtao Wang, Pibin Bing,  Sheng Yuan, Silei Wang, Yongjun Li, Zhongyang Li,

http://www.mdpi.com/2073-4352/8/8/323

We present a theoretical investigation on simultaneous generation of two pairs of Stokes and terahertz (THz) waves from coupled optical parametric oscillations (OPOs) with a quasi-phase-matching (QPM) scheme. The two pairs of Stokes and THz waves are generated by stimulated polariton scattering (SPS) from periodically-inverted GaP. By analyzing the QPM conditions of coupled OPOs we find that the two THz waves with any frequency below the transverse optical (TO) mode frequency of GaP can be simultaneously generated with a suitable pump wavelength. We calculate the photon flux densities of the two THz waves by solving the coupled wave equations. The calculation results indicate that the two THz waves can be efficiently generated with high pump intensities, particularly in lower THz frequency band. 

Abstract-Investigation of Terahertz Generation from Bulk and Periodically Poled LiTaO3 Crystal with a Cherenkov Phase Matching Scheme

Zhongyang Li, Pibin Bing, Sheng Yuan, Degang Xu, and Jianquan Yao
https://www.osapublishing.org/josk/abstract.cfm?uri=josk-19-3-297

Terahertz (THz) wave generation from bulk and periodically poled <TEX>$LiTaO_3$</TEX> (PPLT) with a Cherenkov phase matching scheme is numerically investigated. It is shown that by using the crystal birefringence of bulk <TEX>$LiTaO_3$</TEX> and a grating vector of PPLT, THz waves can be efficiently generated by difference frequency generation (DFG) with a Cherenkov phase matching scheme. The frequency tuning characteristics of the THz wave via varying wavelength of difference frequency waves, phase matching angle, poling period of PPLT and working temperature are theoretically analyzed. The parametric gain coefficient in the low-loss limit and the absorption coefficient of the THz wave during the DFG process in the vicinity of polariton resonances are numerically analyzed. A THz wave can be efficiently generated by utilizing the giant second order nonlinearities of <TEX>$LiTaO_3$</TEX> in the vicinity of polariton resonances.

© 2015 Optical Society of Korea

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Abstract-Terahertz wave parametric oscillations at polariton resonance using a MgO:LiNbO3 crystal

Zhongyang Li, Pibin Bing, Sheng Yuan, Degang Xu, and Jianquan Yao
https://www.osapublishing.org/ao/abstract.cfm?uri=ao-54-18-5645

Terahertz wave (THz-wave) parametric oscillations with a noncollinear phase-matching scheme at polariton resonance using a MgO:LiNbO3 crystal with a surface-emitted configuration are investigated. We investigate frequency tuning characteristics of a THz-wave via varying the wavelength of the pump wave and phase-matching angle. The effective parametric gain length under the noncollinear phase-matching condition is calculated. Parametric gain and absorption characteristics of a THz-wave in the vicinity of polariton resonances are analyzed.

© 2015 Optical Society of America

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