Efficient parametric terahertz generation in quasi-phase-matched GaP through cavity enhanced difference-frequency generation

We report an efficient parametric terahertz (THz) source by using bonded quasi-phase-matched (QPM) GaP crystals pumped by the C-band pulsed fiber lasers in a master oscillator power amplifier configuration, based on difference frequency generation (DFG). We observed that the QPM-GaP crystals can effectively increase the THz generation power and efficiency by increasing the number of periods. Moreover, we observed external cavity enhanced THz DFG by placing the QPM-GaP crystal in an external ring cavity. The THz cavity enhancement factor of approximately 250 has been achieved in comparison with a single-pass THz DFG. The maximum THz average power can reach 339 μW, corresponding to a power conversion efficiency of 2.43×10−4 and a quantum efficiency of 3.16%.

[1]  Kodo Kawase,et al.  Terahertz-wave surface-emitted difference frequency generation in slant-stripe-type periodically poled LiNbO3 crystal , 2002 .

[2]  Xicheng Zhang,et al.  Materials for terahertz science and technology , 2002, Nature materials.

[3]  Takashi Kondo,et al.  Second-order nonlinear susceptibilities of various dielectric and semiconductor materials , 2002 .

[4]  Peter G. Schunemann,et al.  Coherent terahertz waves based on difference-frequency generation in an annealed zinc–germanium phosphide crystal: improvements on tuning ranges and peak powers , 2004 .

[5]  Wei Shi,et al.  Tunable terahertz waves generated by mixing two copropagating infrared beams in GaP. , 2005, Optics letters.

[6]  Y.J. Ding,et al.  Fingerprinting molecules based on direct measurement of absorption spectrum by frequency-tuning monochromatic THz source , 2004, (CLEO). Conference on Lasers and Electro-Optics, 2005..

[7]  Hirokazu Takenouchi,et al.  Terahertz-wave generation from quasi-phase-matched GaP for 1.55μm pumping , 2006 .

[8]  Martin M. Fejer,et al.  Terahertz-wave generation in quasi-phase-matched GaAs , 2006 .

[9]  Wei Shi,et al.  Single-frequency terahertz source pumped by Q-switched fiber lasers based on difference-frequency generation in GaSe crystal. , 2007, Optics letters.

[10]  M M Fejer,et al.  Intracavity terahertz-wave generation in a synchronously pumped optical parametric oscillator using quasi-phase-matched GaAs. , 2007, Optics letters.

[11]  Wei Shi,et al.  High-Power All-Fiber-Based Narrow-Linewidth Single-Mode Fiber Laser Pulses in the C-Band and Frequency Conversion to THz Generation , 2009, IEEE Journal of Selected Topics in Quantum Electronics.

[12]  Carlo Sirtori,et al.  Phase-locking of a 2.7-THz quantum cascade laser to a mode-locked erbium-doped fibre laser , 2010 .

[13]  See Leang Chin,et al.  Broadband terahertz wave remote sensing using coherent manipulation of fluorescence from asymmetrically ionized gases , 2010, CLEO/QELS: 2010 Laser Science to Photonic Applications.

[14]  W. Shi,et al.  Enhanced terahertz source based on external cavity difference-frequency generation using monolithic single-frequency pulsed fiber lasers. , 2010, Optics letters.

[15]  Yi Jiang,et al.  Power scaling of widely-tunable monochromatic terahertz radiation by stacking high-resistivity GaP plates , 2010 .

[16]  M. Koch,et al.  Room temperature continuous wave milliwatt terahertz source. , 2010, Optics express.