宽带低相干光单次时间相干性测量研究

侯春媛; 饶大幸; 李福建; 郑权; 高妍琦; 崔勇; 赵晓晖; 贺瑞敬; 隋展; 向霞

doi:10.11884/HPLPB202133.210027

宽带低相干光单次时间相干性测量研究

doi: 10.11884/HPLPB202133.210027

侯春媛^1,,
饶大幸^2, ,,
李福建²,
郑权²,
高妍琦²,
崔勇²,
赵晓晖²,
贺瑞敬²,
隋展²,
向霞^1, ,

1.
电子科技大学物理学院，成都 611731
2.
中国工程物理研究院上海激光等离子体研究所，上海 201800

详细信息

作者简介:
侯春媛（1995—），女，硕士研究生，从事激光光场测量研究

通讯作者:
饶大幸（1987—），男，博士研究生，从事光纤激光技术研究

向　霞（1974—），女，教授，博士，从事强激光、粒子束与物质相互作用研究

中图分类号: O436.1
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出版历程
- 收稿日期: 2021-01-24
- 修回日期: 2021-03-17
- 网络出版日期: 2021-06-25
- 刊出日期: 2021-07-15

Single-shot measurement method of temporal coherence for low-coherence broadband light

1.
Institute of Physics, UESTC, Chengdu 611731, China
2.
Shanghai Institute of Laser Plasma, CAEP, Shanghai 201800, China

摘要

摘要: 传统测量光束时间相干性的方法是通过机械扫描的方式实现的，这种方法不能够实现单次测量，而且对于相干时间较短的宽带光测量误差较大。本文提出了一种单次时间相干性测量的新方法，通过给迈克尔逊干涉仪的反射镜引入楔角，使光束波前产生随位置变化的延迟差，可从单次测量的一幅干涉图中计算提取出光场完整的时间相干性信息。实验中测量了不同宽带入射光的时间相干性，均与理论结果吻合较好。单次时间相干性测量的方法将为高功率宽带激光装置提供更为方便的时间相干性测量手段，提高实验测量效率。
- 时间相干性 /
- 单次测量 /
- 宽带光 /
- 复相干度 /
- 干涉
Abstract: The traditional method of measuring temporal coherence is realized by means of mechanical scanning. However, this method can not be used for single-shot measurement, and the measurement error is larger for broadband light. In this paper, a new method is proposed for measuring temporal coherence properties through one shot. By tilting one mirror of Michelson interferometer, the delay difference of beam wavefront varying with spatial position can be obtained. The temporal coherence information of light field can be calculated and extracted from a single interferogram. The temporal coherence of different broadband light is measured in the experiment, which is in good agreement with the theoretical results. The method will provide a more convenient measurement to temporal coherence for high-power broadband laser device, and improve the measurement efficiency.
- temporal coherence /
- single-shot measurement /
- broadband light /
- complex degree of coherence /
- interference

HTML全文

图 1 迈克尔逊干涉仪示意图

Figure 1. Schematic of Michelson interferometer

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图 2 等厚干涉原理图

Figure 2. Schematic of equal thickness interference

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图 3 实验装置示意图

Figure 3. Schematic of experimental device

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图 4 SLD一阶时间相干特性

Figure 4. First-order temporal coherence of SLD

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图 5 ASE和啁啾脉冲的一阶时间相干特性对比

Figure 5. Comparison of the first-order temporal coherence of ASE and chirped pulse

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