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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 THzwave 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/cm 2,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/cm 2 to 148 MW/cm 2 and 164 MW/cm 2,the maximum output of the THz-wave moved to the high frequency band.We give a reasonable explanation for this phenomenon.
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 the phase matching angle, the tunable THzwave 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 / cm 2, 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 / cm 2 to 148 MW / cm 2 and 164 MW / cm 2, the maximum output of the THz-wave moved to the high frequency band. .