High-efficiency all-optical-fiber column vector light beam laser

A beam laser, high-efficiency technology, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problem of difficult to achieve high-efficiency all-fiber column vector laser output, increase experimental complexity and uncertainty, and difficult to achieve the ultimate Optimal output coupling ratio and other issues to achieve high mode conversion efficiency, high laser slope efficiency, and low insertion loss

Pending Publication Date: 2018-04-03
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, in the all-fiber column vector laser reported at present (such as: Chinese patent CN102544999A), most adopt the dislocation fusion splicing coupling of single-mode fiber and few-mode fiber to realize the conversion from fundamental mode to first-order mode, and the mode conversion efficiency is low (less than 20%); and due to the large intracavity loss due to phase mismatch; at the same time, in order to suppress the output of the fundamental mode beam to ensure the output purity of the firs

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  • High-efficiency all-optical-fiber column vector light beam laser
  • High-efficiency all-optical-fiber column vector light beam laser

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Embodiment Construction

[0021] Before describing the structure of the embodiment in detail, a brief description of the theory of few-mode long-period fiber gratings will be given.

[0022] Few-mode long-period fiber gratings are used in few-mode fibers using ultraviolet laser technology, femtosecond laser technology, arc technology, mechanical microbend technology, CO 2 The resonant wavelength of the few-mode long-period fiber grating is within the emission spectrum range of the doped fiber and within the reflection wavelength range of the two reflective surfaces. The few-mode fiber refers to the fiber whose normalized frequency V is greater than 2.405 and can support few-mode or multi-mode transmission. Because TM 01 and TE 01 The mode belongs to the first-order mode, so we generally take 2.40501 and TE 01 mode, and can avoid interference caused by higher-order modes. Similar to the long-period grating written in a single-mode fiber, when the resonance condition is satisfied, the incident fundam...

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Abstract

The invention discloses a high-efficiency all-fiber cylindrical vector beam laser. Since the few-mode long-period fiber grating can realize high-efficiency conversion from the fundamental mode to the first-order mode at the resonant wavelength and has the characteristics of low insertion loss, the few-mode The long-period fiber grating is introduced into the laser cavity as a mode conversion device to improve the mode conversion efficiency and reduce the loss in the cavity to achieve high-efficiency output of the cylindrical vector laser beam. The laser includes an amplifier module, which is used to provide laser generation and amplification; a resonator module, which is used to realize laser resonance; a polarization control module, which is used to control the polarization state of the laser in the cavity; for high-efficiency mode switching. The cylindrical vector beam output by the laser has the characteristics of high efficiency, low threshold, high purity, and mode switchable, and has no spatial coupling structure, high stability, good portability, and is suitable for commercialization.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a high-efficiency cylindrical vector beam laser based on a few-mode long-period fiber grating. Background technique [0002] Different from ordinary polarized beams, cylindrical vector light means that the polarization direction on the cross-section of the beam has a cylindrically symmetrical distribution, and its transverse light intensity distribution is circular. Generally, it can be divided into angular and radial polarized light. [0003] The special polarization and amplitude characteristics of cylindrical vector light make it applicable in many fields, such as particle manipulation, material processing, plasma excitation, optical storage, super-resolution microscopic imaging, optical communication and other fields. [0004] Compared with the column vector laser with spatial coupling structure, the all-fiber column vector laser has the characteristics of good portability, good s...

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Application Information

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IPC IPC(8): H01S3/067H01S3/091
CPCH01S3/06712H01S3/06716H01S3/0675H01S3/091
Inventor 陈瑞山王安廷王敬好孙方陵明海
Owner UNIV OF SCI & TECH OF CHINA
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