High-power terahertz radiation from surface-emitted THz-wave parametric oscillator |
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| Authors: | Li Zhong-Yang Yao Jian-Quan Xu De-Gang Zhong Kai Wang Jing-Li Bing Pi-Bin |
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| Affiliation: | College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072, China; Key Laboratory of Opto-electronics Information Science and Technology of Ministry of Education, Tianjin University, Tianjin 300072, China |
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| Abstract: | We report a pulsed surface-emitted THz-wave parametric oscillator based on two MgO:LiNbO3 crystals pumped by a multi-longitudinal mode Q-switched Nd:YAG laser. Through varying the phase matching angle, the tunable THz-wave output from 0.79 THz to 2.84 THz is realized. The maximum THz-wave output was 193.2 nJ/pulse at 1.84 THz as the pump power density was 212.5 MW/cm2, corresponding to the energy conversion efficiency of 2.42×10-6 and the photon conversion efficiency of about 0.037%. When the pump power density changed from 123 MW/cm2 to 148 MW/cm2 and 164 MW/cm2, the maximum output of the THz-wave moved to the high frequency band. We give a reasonable explanation for this phenomenon. |
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| Keywords: | THz-wave parametric oscillator noncollinear phase matching THz-wave polarization frequency tunable output |
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