Modulated comb-like pulse distribution induced by intracavity Sagnac filtering in a fiber laser

•A modulated comb-like pulse distribution generated from a mode-locked fiber laser is achieved experimentally.•For the first time the generation of the modulated comb-like pulse distribution is proved by theoretical and experimental analyses to be a result of intracavity Sagnac filtering.•A theory i...

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Bibliographic Details
Published in:Optics and laser technology 2022-01, Vol.145, p.107480, Article 107480
Main Authors: Li, Mengxian, Shu, Yiqing, Gu, Lin, Cui, Zhengwei, Luo, Aiping, Li, Yongyao, Chen, Weicheng
Format: Article
Language:English
Subjects:
Data processing
Delay lines
Fiber laser
Fiber lasers
Filtration
Interferometers
Laser mode locking
Lasers
Mode-locked pulse
Noise generation
Sagnac filtering
Separation
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Summary:•A modulated comb-like pulse distribution generated from a mode-locked fiber laser is achieved experimentally.•For the first time the generation of the modulated comb-like pulse distribution is proved by theoretical and experimental analyses to be a result of intracavity Sagnac filtering.•A theory is developed to model our experimental results and calculate the transient generation process of the comb-like pulse bunch. We demonstrate experimentally a modulated comb-like pulse distribution generated from a mode-locked fiber laser with an intracavity Sagnac interferometer. The modulated comb-like pulse bunch profile is composed of a sequence of symmetrically distributed pulses with a fixed temporal separation. The modulated bunch profiles can be dynamically adjusted by manipulating the pump power and the polarization settings of the fiber laser. The pulse separation in the bunch is determined by the optical delay line of the Sagnac interferometer. We develop a theory to model our experimental results and calculate the transient generation process of the comb-like pulse bunch. The theoretical results are in accordance with the experimental results. For the first time the generation of the modulated comb-like pulse distribution is proved by theoretical and experimental analyses to be a result of intracavity Sagnac filtering. These results will help in realizing adjustable modulated pulse bunch generation in noise-driven dissipative systems for potential applications in laser measuring and information processing.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2021.107480