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飞秒激光作用下光整流晶体的损伤阈值分析

Analysis on damage thresholds of optical rectification crystals under femtosecond lasers

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摘要

光整流效应是产生太赫兹波的有效途径之一,而产生高功率太赫兹波则需要采用高强度的飞秒激光激励光整流晶体,但激光强度过大会造成晶体损伤,从而严重影响高功率太赫兹波的输出。因此,对光整流晶体的损伤阈值进行研究具有重要的理论意义与实用价值。通过对飞秒激光与非线性光整流晶体材料相互作用物理过程进行分析,建立了飞秒激光作用下光整流晶体损伤阈值的预估模型,比较分析了铌酸锂、碲化锌和硒化锌三种晶体材料的损伤阈值随飞秒激光脉宽的变化规律。结果表明,当飞秒激光的脉宽相对较小时,光致电离在整个作用过程中占主导地位,随着脉宽的增大,雪崩电离逐渐起主要作用;雪崩电离速率和光致电离速率均与晶体的禁带宽度密切有关,光整流晶体材料禁带宽度越大,晶体材料的损伤阈值越高;铌酸锂晶体的损伤阈值明显高于碲化锌和硒化锌晶体,更适合用于高功率太赫兹波的产生。

Abstract

Optical rectification effect is one of the effective ways to generate terahertz(THz) wave, and the generation of high-power THz wave requires femtosecond laser with high intensity to excite optical rectification crystals. However, the crystal will be damaged if the intensity of femtosecond laser is too high, seriously affecting the output of high-power THz wave. Therefore, it is of great importance to study the damage thresholds of optical rectification crystals for both theoretically and practically. In this paper, the interaction mechanism between the femtosecond laser and the nonlinear optical rectification crystals was analyzed, and the prediction model of damage thresholds of optical rectification crystals under femtosecond laser was built up. Then on this basis, the variation of damage thresholds of LiNbO3, ZnTe and ZnSe crystals with the pulse duration of femtosecond laser was compared and analyzed. The results show that, the photoionization dominates in the whole process when the pulse duration of femtosecond laser is relatively short, while the avalanche ionization gradually plays an important role with the increase of pulse duration. Avalanche ionization rate and photoionization rate are related closely with the forbidden band width of the crystal. Consequently, the greater the forbidden band widths of optical rectification crystals, the higher the damage thresholds are. The damage thresholds of LiNbO3 are higher than those of ZnTe and ZnSe crystals, which is more suitable for the generation of high-power THz wave.

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中图分类号:O437

DOI:10.3788/irla201645.0106004

所属栏目:激光技术及应用

基金项目:中国工程物理研究院太赫兹科学技术基金(CAEPTHZ201305);四川省教育厅创新团队计划(13Td0048)

收稿日期:2015-05-05

修改稿日期:2015-06-03

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作者单位    点击查看

于军立:四川大学 电子信息学院,四川 成都 610065
孟庆龙:四川大学 电子信息学院,四川 成都 610065
叶 荣:成都师范学院 物理与工程技术学院,四川 成都 611130
钟哲强:四川大学 电子信息学院,四川 成都 610065
张 彬:四川大学 电子信息学院,四川 成都 610065

联系人作者:于军立(yujunli@sohu.com)

备注:于军立(1988-),男,硕士生,主要从事太赫兹波源、晶体损伤等方面的研究。

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引用该论文

Yu Junli,Meng Qinglong,Ye Rong,Zhong Zheqiang,Zhang Bin. Analysis on damage thresholds of optical rectification crystals under femtosecond lasers[J]. Infrared and Laser Engineering, 2016, 45(1): 0106004

于军立,孟庆龙,叶 荣,钟哲强,张 彬. 飞秒激光作用下光整流晶体的损伤阈值分析[J]. 红外与激光工程, 2016, 45(1): 0106004

被引情况

【1】董 超,孙中浩,张亚春,何 湘,倪晓武,骆晓森. 激光等离子体丝阵列对10 GHz微波传输特性的影响. 红外与激光工程, 2018, 47(10): 1006001--1

【2】蔡建文,胡衍雷,黄文浩. 微爆材料的飞秒激光三维光存储. 红外与激光工程, 2018, 47(11): 1106010--1

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