Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis

Guoqing Pu; Lilin Yi; Li Zhang; Chao Luo; Zhaohui Li; Weisheng Hu

doi:10.1038/s41377-020-0251-x

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Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis

Article

- Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
- Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
- LSA 2020年9卷第1期页码：114-121
- Affiliations：
  
  1.State Key Lab of Advanced Communication Systems and Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai Jiao Tong University, Shanghai 200240, China
  2.Sun Yat-sen University/Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China
- Author bio：
  
  Correspondence: Lilin Yi (lilinyi@sjtu.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-0251-x
  中图分类号：
- 纸质出版日期：2020，
  
  网络出版日期：2020-01-28，
  
  收稿日期：2019-11-07，
  
  修回日期：2020-01-09，
  
  录用日期：2020-01-14
- Accepted：
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Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis[J]. LSA, 2020,9(1):114-121.

Pu, G. Q. et al. Intelligent control of mode-locked femtosecond pulses by time-stretchassisted real-time spectral analysis. Light: Science & Applications, 9, 114–121 (2020).
Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis[J]. LSA, 2020,9(1):114-121. DOI： 10.1038/s41377-020-0251-x.

Pu, G. Q. et al. Intelligent control of mode-locked femtosecond pulses by time-stretchassisted real-time spectral analysis. Light: Science & Applications, 9, 114–121 (2020). DOI： 10.1038/s41377-020-0251-x.

摘要

Abstract

Mode-locked fiber lasers based on nonlinear polarization evolution can generate femtosecond pulses with different pulse widths and rich spectral distributions for versatile applications through polarization tuning. However

a precise and repeatable location of a specific pulsation regime is extremely challenging. Here

by using fast spectral analysis based on a time-stretched dispersion Fourier transform as the spectral discrimination criterion

along with an intelligent polarization search algorithm

for the first time

we achieved real-time control of the spectral width and shape of mode-locked femtosecond pulses; the spectral width can be tuned from 10 to 40 nm with a resolution of ~1.47 nm

and the spectral shape can be programmed to be hyperbolic secant or triangular. Furthermore

we reveal the complex

repeatable transition dynamics of the spectrum broadening of femtosecond pulses

including five middle phases

which provides deep insight into ultrashort pulse formation that cannot be observed with traditional mode-locked lasers.

关键词

Keywords

references

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