飞秒激光脉冲在大气中的色散及补偿

沈振民; 刘红影; 蓝天; 李少辉; 倪国强; 刘浩杰

飞秒激光脉冲在大气中的色散及补偿

1.
北京理工大学光电成像技术与系统教育部重点实验室,北京 100081;
2.
中国空间技术研究院,北京 100094

基金项目:

中国科学院光电研究院“雏鹰计划”

详细信息

作者简介:
沈振民（1983-），男，博士生，主要从事飞秒激光测距方面的研究。Email：zhenminshen@yahoo.cn；倪国强（1946-），男，教授，主要从事光电成像技术方面的研究。Email：nigq01@sina.com

沈振民（1983-），男，博士生，主要从事飞秒激光测距方面的研究。Email：zhenminshen@yahoo.cn；倪国强（1946-），男，教授，主要从事光电成像技术方面的研究。Email：nigq01@sina.com

中图分类号: TN249

Dispersion and compensation of femtosecond laser pulses in the atmosphere

1.
Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education of China,Beijing Institute of Technology,Beijing 100081,China;
2.
China Academy of Space Technology,Beijing 100094,China

摘要: 卫星飞秒激光测距理论上可达到亚微米量级的测距精度，但飞秒激光脉冲在大气中传输时由色散导致的脉冲展宽显著，会使测距精度下降。为补偿飞秒激光脉冲在大气中的色散需对其色散量进行定量计算。推导了飞秒激光脉冲在大气中的群速度色散和脉冲展宽公式，表明脉冲展宽程度和群速度色散及传输距离有关；中心波长相同的飞秒激光脉冲脉宽越窄色散越严重，而当脉宽相同时，中心波长越短色散越严重。计算比较了大气和BK7玻璃的群延时、群速度色散和三阶色散。卫星激光测距系统应采用中心波长较长的1 550 nm的飞秒激光脉冲，脉宽应适当选取。由于飞秒激光色散严重，提出了采用单模光纤序列进行粗补偿和采用光栅对进行精密补偿的两种补偿相结合的方式对其色散进行补偿。
- 飞秒激光测距 /
- 脉冲展宽 /
- 群速度色散 /
- 色散补偿
Abstract: Satellite femtosecond laser ranging can theoretically achieve the ranging accuracy in the order of submicron, but femtosecond laser pulse duration broadening caused by the dispersion when it propagates in the atmosphere significantly makes the ranging accuracy decreased. To compensate the dispersion, the dispersion amount of femtosecond laser was calculated in the atmosphere. The group velocity dispersion formula and pulse duration broadening formula of femtosecond laser pluses in the atmosphere were derived. The results show that laser pulse broadening is determined by the group velocity dispersion and the propagation distance. Also shows that the dispersion is much larger when the pulse duration is much smaller under the same center wavelength, and the dispersion is much larger when the center wavelength is much smaller under the same pulse duration. Calculate the group delay, the group velocity dispersion and the three order dispersion in the atmosphere and BK7. The satellite femtosecond laser ranging system should adopt femtosecond laser with a longer center wavelength of 1 550 nm, and the pulse duration should be properly selected. Because femtosecond laser pulses have large dispersion when it transfers in the atmosphere, the dispersion compensation method is given by using single mode fiber sequence for the coarse compensation and grating pairs for the fine compensation.
- femtosecond laser ranging /
- pulse broadening /
- group velocity dispersion /
- dispersion compensation

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飞秒激光脉冲在大气中的色散及补偿

Dispersion and compensation of femtosecond laser pulses in the atmosphere

计量

飞秒激光脉冲在大气中的色散及补偿

1. 北京理工大学光电成像技术与系统教育部重点实验室,北京 100081;

2. 中国空间技术研究院,北京 100094

English Abstract

Dispersion and compensation of femtosecond laser pulses in the atmosphere

1. Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education of China,Beijing Institute of Technology,Beijing 100081,China;

2. China Academy of Space Technology,Beijing 100094,China

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留言板

飞秒激光脉冲在大气中的色散及补偿

Dispersion and compensation of femtosecond laser pulses in the atmosphere

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出版历程

飞秒激光脉冲在大气中的色散及补偿

1. 北京理工大学 光电成像技术与系统教育部重点实验室,北京 100081; 2. 中国空间技术研究院,北京 100094

English Abstract

Dispersion and compensation of femtosecond laser pulses in the atmosphere

1. Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education of China,Beijing Institute of Technology,Beijing 100081,China; 2. China Academy of Space Technology,Beijing 100094,China

全文HTML

目录

1. 北京理工大学光电成像技术与系统教育部重点实验室,北京 100081;

2. 中国空间技术研究院,北京 100094

1. Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education of China,Beijing Institute of Technology,Beijing 100081,China;

2. China Academy of Space Technology,Beijing 100094,China