温度对LiNbO3晶体THz辐射产生效率的影响

温度对LiNbO₃晶体THz辐射产生效率的影响

陈华¹,², 汪力², 彭慰先¹

1. 吉林大学物理学院, 长春 130021; 2. 中国科学院物理研究所, 北京 100080

收稿日期:2006-03-28 修回日期:1900-01-01 出版日期:2007-03-26 发布日期:2007-03-26
通讯作者: 彭慰先

Temperature Effect on Efficiency of Terahertz Radiation Emission in LiNbO3Crystal

CHEN Hua¹,², WANG Li², PENG Wei xian¹

1. College of Physics, Jilin University, Changchun 130021, China; 2. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

Received:2006-03-28 Revised:1900-01-01 Online:2007-03-26 Published:2007-03-26
Contact: PENG Wei xian

摘要/Abstract

摘要： 利用超短激光脉冲泵浦电光晶体LiNbO₃产生脉冲THz辐射, 并用非线性光学差频原理解释了THz的产生机制. 改变泵浦激光能量, 实验结果表明, THz脉冲波形的最大振幅与泵浦激光能量为平方关系, 随泵浦能量的增大, 晶体温度逐渐升高, 增加了对所产生THz辐射的吸收, 并逐渐偏离平方关系. 通过降低晶体温度, 减小TO声子-极化子因非谐振衰减为两个声学声子而引起的THz吸收, 提高了THz的产生效率. 

关键词: THz, 差频, 电光晶体, 非线性效应, 声子

Abstract: Subpicosecond terahertz (THz) pulses were generated by supershorted laser pulses pumping a nonlinearelectric-optical crystal LiNbO₃. Spectral analysis of THz pulse waveform reveals that the generation mechanism of THz radiation is nonlinear difference frequency effect. The laser power dependence of THz emission intensity was also investigated, the experimental curve slightly deviated from quadratic curve along with the increase of laser pumping power. By cooling of the crystal, the THz emission efficiency was increased.

Key words: terahertz (THz), difference frequency, electric-optical crystal, nonlinear effect, phonon

中图分类号:

陈华,, 汪力, 彭慰先. 温度对LiNbO₃晶体THz辐射产生效率的影响[J]. J4, 2007, 45(02): 271-274.

CHEN Hua,, WANG Li, PENG Wei xian. Temperature Effect on Efficiency of Terahertz Radiation Emission in LiNbO3Crystal[J]. J4, 2007, 45(02): 271-274.

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温度对LiNbO₃晶体THz辐射产生效率的影响

Temperature Effect on Efficiency of Terahertz Radiation Emission in LiNbO3Crystal

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