Vector soliton fiber laser, control method and application thereof

A fiber laser and fiber grating technology, applied in the directions of lasers, phonon exciters, laser parts, etc., can solve the problems of no correlation between vector solitons and cylindrical vector speed of light, complex structure, etc. Effects with high damage threshold

Pending Publication Date: 2022-03-15
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

[0003] Through the above analysis, the problems and defects of the existing technology are: the existing all-fiber lasers only generate cylindrical vector beams under the premise of scalar solitons, there is no inherent correlation between the correlation vector solitons and the cylindrical vector light speed, and there are limitations of complex structures

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  • Vector soliton fiber laser, control method and application thereof
  • Vector soliton fiber laser, control method and application thereof
  • Vector soliton fiber laser, control method and application thereof

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Embodiment

[0044] The invention provides a control method of a vector soliton fiber laser, specifically comprising:

[0045] by CO 2 The laser etches the long-period fiber grating on the graded two-mode fiber, which causes an asymmetric refractive index change in the fiber, which makes the refractive index distribution of the fiber waveguide change unevenly, and the grating is written on the fiber by an external laser. The mutual orthogonality between the random destruction modes, the mode coupling of energy occurs, and the transformation from the fundamental mode light to the higher-order mode is realized;

[0046] On the premise of not changing the mode-locked state in the cavity, by adjusting the polarization controller before and after the long-period fiber, twisting the polarization controller in the cavity changes the output polarization state distribution in the cavity, and finally obtains a cylindrical vector beam.

[0047] Among them, in the energy generation mode coupling, the...

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Abstract

The invention belongs to the technical field of fiber lasers, and relates to a vector soliton fiber laser, a control method and application thereof, and the laser comprises a laser emitting assembly, a wavelength division multiplexer, a gain fiber, a polarization independent isolator, a mode locking assembly, a coupler and a mode conversion assembly which are connected in sequence. The mode conversion assembly comprises a second polarization controller, a long-period fiber grating, a third polarization controller, an optical fiber collimator, a polaroid and a camera. The experimental cavity does not contain any polarization element, the structure is simpler and more compact, the damage threshold value is higher, and high-purity ultrafast column vector light beams can be achieved based on the mode conversion function of the long-period fiber grating. The column vector light beam generated in the mode has the advantages of being small in loss, wide in bandwidth, high in purity and stable in output, the ultrafast column vector light beam combines the advantages of the ultrafast pulse and the column vector light beam, and wide application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and in particular relates to a vector soliton fiber laser, a control method and an application thereof. Background technique [0002] At present, cylindrical vector beams (Cylindrical vector beams, CVBs) are special beams with polarization singularities. Observing the cross section of cylindrical vector beams, it can be found that the polarization state is axisymmetrically distributed, and generally divided into radially polarized light and Angularly polarized light, due to the unique polarization and amplitude characteristics of the CVBs light field, has been widely used in optical communication, surface plasmon excitation, light trapping and other fields. Notably, ultrafast CVBs pulses in picosecond or femtosecond lasers expand various new applications, such as nonlinear frequency conversion, super-resolution microscopy, and material processing, etc. Ultrafast CVBs are usually obtained by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/10H01S3/106H01S3/11
CPCH01S3/1106H01S3/0675H01S3/1118H01S3/10061H01S3/106
Inventor 金亮王家柱赵鑫张贺徐英添马晓辉
Owner CHANGCHUN UNIV OF SCI & TECH
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