Fiber laser system capable of switching fundamental and second harmonic mode locking

A fiber laser and second-order harmonic technology, applied in lasers, laser components, phonon exciters, etc., can solve problems such as reduced stability of mode-locked lasers, affecting birefringence characteristics of optical fibers, and instability

Active Publication Date: 2017-02-22
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

However, these graphene saturable absorber passively mode-locked fiber lasers are vulnerable to environmental changes, which means they are sensitive to externally induced changes such as s

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  • Fiber laser system capable of switching fundamental and second harmonic mode locking
  • Fiber laser system capable of switching fundamental and second harmonic mode locking
  • Fiber laser system capable of switching fundamental and second harmonic mode locking

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[0021] The objects and functions of the present invention and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0023] Such as figure 1 As shown, the present invention provides a switchable fiber laser system that can realize fundamental-order and second-order harmonic mode-locking, including a full polarization-maintaining erbium-doped fiber laser, and the full polarization-maintaining erbium-doped...

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Abstract

The invention provides a fiber laser system capable of switching fundamental and second harmonic mode locking. By the aid of all polarization-maintaining fiber mode locking technology based on a reflecting graphene saturable absorption mirror, an all polarization-maintaining fiber resonant cavity can be used for avoiding mode-locking laser instability caused by fiber birefraction change due to external force (such as pressure and bending) in environments, laser can be kept transmitted in the cavity along a polarization-maintaining fiber slow axis along a single linear polarization direction, mode-locking pulse self-starting is more easily realized, usage of elements such as a polarization controller can be decreased, and intra-cavity loss is reduced. The reflecting graphene saturable absorption mirror uses more than five layers of graphene as a saturable absorber, the modulation depth of the graphene is increased along with increase of the number of the layers, fundamental mode locking pulse is obtained at the pumping power ranging from 79mW to 102mW, and second mode locking pulse is obtained when the pumping power reaches 108mW.

Description

technical field [0001] The invention relates to a graphene passive mode-locked fiber laser, belonging to the technical field of lasers. Background technique [0002] As a pulsed light source, pulsed fiber laser has the advantages of compact structure, high stability, high conversion efficiency, good beam quality, easy maintenance and low cost. It has broad application prospects in industrial processing, medical treatment, communication and other fields. In particular, the ultrashort pulse research based on optical fiber mode-locking technology has great potential in fine processing, optical fiber sensing, precision optical measurement and other fields. The main mode-locked fiber laser technologies reported so far include nonlinear polarization rotation (NPR) mode-locking, nonlinear optical loop mirrors (NOLM) mode-locking, semiconductor saturable absorber mirror (semiconductor saturable absorber mirror) , SESAM) mode-locking and single-walled carbon nanotubes (single-walled...

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Application Information

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IPC IPC(8): H01S3/067H01S3/098
CPCH01S3/06716H01S3/1118
Inventor 祝连庆陈凯董明利何巍骆飞张雯孟阔
Owner BEIJING INFORMATION SCI & TECH UNIV
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