High-power terahertz radiation from surface-emitted THz-wave parametric oscillator

High-power terahertz radiation from surface-emitted THz-wave parametric oscillator
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表面发射太赫兹波参量振荡器的高功率太赫兹辐射

DOI:
10.1088/1674-1056/20/5/054207
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发表时间:
2011-05
期刊:
影响因子:
1.7
通讯作者:
--
中科院分区:
物理与天体物理3区
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--
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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 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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