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

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5 Author(s)
Petersen, Eliot B. ; NP Photonics Inc., 9030 S Rita Rd., Tucson, Arizona 85747, USA ; Wei Shi ; Chavez-Pirson, Arturo ; Peyghambarian, N.
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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%.

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Applied Physics Letters  (Volume:98 ,  Issue: 12 )