基于光学差频的太赫兹源设计与校准研究
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O433.1

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国家自然科学基金项目(62127804);安徽省自然科学基金项目(2308085QF215)


Research on Design and Calibration of Terahertz Source Based on Optical Difference Frequency
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    摘要:

    差频模块是可调谐太赫兹源的核心部件,其性能直接影响太赫兹波的产生效率。为了提高太赫兹输出功率,基于光功率放大后的激光参数,设计了2:1和3:1的激光缩束系统,使两束激光的光斑直径一致,优化了合束效果。通过偏振态校准,使激光保持水平线性偏振,从而充分利用晶体的最大非线性系数。经过激光合束调试,两束激光能够实现良好的合束,且聚焦后可形成直径约为22 μm的光斑,有效提升了差频效应。实验结果表明,该模块成功实现了太赫兹波输出。

    Abstract:

    The difference-frequency module is the core component of a tunable terahertz source, and its performance directly affects the efficiency of terahertz wave generation. To increase terahertz output power, 2:1 and 3:1 laser beam reduction systems are designed based on the laser parameters after optical power amplification. This ensures that the spot diameters of the two laser beams are consistent, optimizing the beam combining effect. Polarization calibration is used to maintain horizontal linear polarization of the lasers, thereby fully utilizing the maximum nonlinear coefficient of the crystal. After laser beam combining debugging, the two laser beams can be well combined, and after focusing, a spot with a diameter of approximately 22 μm can be formed, effectively enhancing the difference-frequency effect. Experimental results show that this module has successfully enabled terahertz wave generation.

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朱军锋,张桂鸣,张亭,等.基于光学差频的太赫兹源设计与校准研究[J].红外,2025,46(9):22-31.

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