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Device for optimizing quality of high-power laser beam, testing device and preparation method

A laser beam quality and high power technology, applied in the laser field, can solve problems such as poor beam quality, achieve the effects of reducing area, improving nonlinearity, and low cost

Active Publication Date: 2020-11-20
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of poor beam quality output by high-power fiber lasers in the prior art, the present invention proposes a high-power laser beam quality optimization device, test device and preparation method. The device is based on the self-image effect and the Kerr effect. Principle, with the advantages of simple structure, low cost, simple production and strong compatibility

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  • Device for optimizing quality of high-power laser beam, testing device and preparation method
  • Device for optimizing quality of high-power laser beam, testing device and preparation method

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Embodiment 1

[0027] like figure 1 As shown, the present invention provides a device for optimizing the quality of high-power laser beams, which is formed by melting and tapering a graded-index multimode fiber to form a structure with a thin middle and thick ends, and the two sides are still graded-index multimode fibers; After the graded-index multimode optical fiber is fused and tapered, the heated area will form a tapered region 41 , including a waist region 411 and a transition region 412 . Wherein, the diameter of the girdle region 411 is 10 microns, and the transition region 412 is between the girdle region 41 and the region 42 of the non-melted tapered tapered region. graded-index multimode fiber.

[0028] In this embodiment, the core diameter of the graded-index multimode optical fiber is 62.5 microns, and the cladding diameter is 125 microns.

[0029] The tapered graded-index optical fiber has a waist diameter of 10 microns, a tapered length of 5.0 cm, a total fiber length of 1 m...

Embodiment 2

[0031] like figure 2 Shown, the present invention also provides a kind of testing device for high-power laser beam quality optimization device, comprises the graded-index multimode optical fiber of high-power laser 1, collimator 2, focusing lens 3, melting taper (for High-power laser beam quality optimization device) 4, glass slide 5 and CCD camera 6;

[0032] The output light of the high-power laser 1 is coupled into the graded-index multimode fiber (for high-power laser beam quality optimization device) 4 fixed on the glass slide 5 through the collimator 2 and the focusing lens 3, The light spot is recorded with a CCD camera 6 at the output end of the fiber.

[0033] image 3 is the stray light spot before entering the fused tapered graded-index multimode fiber, Figure 4 For the clean spot after passing through the graded-index multimode fiber with fused taper, Figure 5 It is the light spot output by the high-power laser passing through the graded-index multimode fibe...

Embodiment 3

[0035] The present invention also provides a preparation method for high-power laser beam quality optimization device, comprising the following steps:

[0036] (1) Peel off the coating layer on the central part of the graded-index multimode fiber, and wipe it clean with alcohol;

[0037] (2) Under the action of the alcohol lamp, the central part of the optical fiber is tapered into a cone area with a minimum diameter of 10 microns by using the method of melting tapering, and the other areas remain unchanged;

[0038] (3) Fix the two ends of the tapered micro-nano fiber on the glass slide.

[0039] Due to the self-image effect of the graded-index multimode fiber, the laser beam enters the fiber and forms periodic light intensity modulation in the fiber core. The Kerr effect will cause periodic refractive index modulation in the fiber core, forming a structure similar to a long-period fiber grating, and there will be nonlinear energy coupling between different modes that meet t...

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Abstract

The invention discloses a device for optimizing the quality of a high-power laser beam. The device is formed by carrying out fused biconical taper on a multimode fiber with a gradient refractive index, after the gradient refractive index multimode optical fiber is subjected to fused biconical taper, a heated region can form a taper region, and the taper region comprises a waist region and a transition region; the transition region is located between the waist region and the non-fused biconical taper region, and the diameter of the transition region is gradually increased away from the waist region; and the regions without fused biconical taper at the two sides are still the multimode optical fibers with gradient refractive indexes. Based on the self-mapping effect and the Kerr effect of the multimode optical fiber with the gradient refractive index, the cluttered speckles output by the high-power laser are converted into fundamental mode-like light spots, and the light beam quality isimproved; the provided device scheme has the advantages of compact structure, simple manufacturing, low cost and compatibility with other optical fiber devices.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-power laser beam quality optimization device, testing device and preparation method. Background technique [0002] In high-power fiber lasers, the nonlinear effect limits the power increase. By introducing a large mode field area fiber, the nonlinear effect can be effectively suppressed, but at the same time, the mode instability is introduced, resulting in the degradation of the output high-power beam quality. The further improvement and application of high-power fiber laser power are limited. Common methods to improve the quality of high-power beams include using a long tapered gain fiber, changing the doping concentration of the gain fiber, selecting the best coiling radius of the fiber, and changing the frequency of the pump drive power supply. Problems such as complexity or low reliability are not conducive to practical applications. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/255G02B6/028G02B27/09G01M11/02
CPCG02B6/2551G02B6/0288G02B27/0994G01M11/02Y02P10/25
Inventor 罗爱平林孝俊吴家文崔虎罗智超徐文成
Owner SOUTH CHINA NORMAL UNIVERSITY
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