CN218867625U - Fiber laser based on fiber grating protection pumping source - Google Patents

Abstract

The utility model provides a fiber laser based on fiber grating protection pumping source, including the pumping source, output fiber and output head, output fiber connects between pumping source and output head, and output fiber's part is convoluteed and is formed gain fiber, is provided with chirp slope fiber grating on the output fiber, high reflection of light fiber grating, low anti-grating and mode filter ware, and the pumping source, chirp slope fiber grating, high reflection of light fiber grating, gain fiber, low anti-grating, mode filter ware and output head arrange along the optical output direction in proper order. The high-reflection fiber grating is utilized to provide a high-reflection function for the laser resonant cavity, and simultaneously, the chirped inclined fiber grating is utilized to filter out signal light which cannot be reflected by the high-reflection fiber grating, so that the pumping source is efficiently protected.

Description

Fiber laser based on fiber bragg grating protection pumping source

Technical Field

The utility model relates to an optical equipment field especially relates to a fiber laser based on fiber grating protection pumping source.

Background

The fiber laser has the advantages of good beam quality, high conversion efficiency, convenient heat management and the like, and is widely applied to the fields of communication, industrial manufacturing, scientific research, aerospace and the like. The power of the single pump source of the laser is higher and higher, and even the single pump kilowatt laser appears. Referring to fig. 1, the conventional fiber laser includes a PUMP source PUMP, a high reflective fiber grating HR, a gain fiber Active fiber, a low reflective fiber grating OC, and an output head QBH sequentially arranged along an optical output direction, where the high reflective fiber grating HR can prevent 99% of signal light from returning, but still 1% of signal light returns to the PUMP source, and the fiber grating is used as a cavity mirror and cannot achieve a reflectivity of 100%, so that some signal light returns to the inside of the PUMP source to damage the PUMP source.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fiber laser based on fiber grating protection pumping source.

In order to realize the utility model discloses the mesh, the utility model provides a fiber laser based on fiber grating protection pumping source, including the pumping source, output fiber and output head, output fiber connects between pumping source and output head, and the part of output fiber is convoluteed and is formed the gain optic fibre, is provided with chirp slope fiber grating on the output fiber, high reflection of light fiber grating, low anti-grating and mode filter, the pumping source, chirp slope fiber grating, high reflection of light fiber grating, gain optic fibre, low anti-grating, mode filter and output head arrange along the optical output direction in proper order.

In a further aspect, the center wavelength of the chirped tilted fiber grating is the same as the center wavelength of the highly reflective fiber grating.

The beneficial effects of the utility model are that, the present case is through the mode that chirp slope fiber grating and high reflection of light fiber grating arranged in proper order, utilize high reflection of light fiber grating both to provide the function of high reflection for the laser resonant cavity, utilize chirp slope fiber grating can be with the unable reflected signal light filtering of high reflection of light fiber grating simultaneously, then play the effect of protection pump source more closely, the present case makes the function of compromise laser resonant cavity simultaneously the filtering return the signal light of pump source from high reflection, and it is minimum to the pumping light loss that is used for the gain, and it is efficient to the signal light filtering that returns, and chirp slope fiber grating's central wavelength is unanimous with the central wavelength of high reflection of light fiber grating, can filter signal light remaining more effectively.

Drawings

Fig. 1 is a schematic diagram of the optical path of a conventional laser embodiment.

Fig. 2 is a schematic diagram of an optical path of an embodiment of the laser of the present invention.

Fig. 3 is a schematic diagram of the embodiment of the laser of the present invention when manufacturing a highly reflective fiber grating.

Fig. 4 is a schematic diagram of an embodiment of the present invention for fabricating a chirped tilted fiber grating.

The present invention will be further explained with reference to the drawings and examples.

Detailed Description

Referring to fig. 2, the fiber laser includes a pumping source 11, an output fiber 10 and an output stub 17, the output fiber 10 is connected between the pumping source 11 and the output stub 17, a portion of the output fiber 10 is wound to form a gain fiber 14, the output fiber 10 is provided with a chirped tilted fiber grating 12, a high reflective fiber grating 13, a low reflective grating 15 and a mode filter 16, and the pumping source 11, the chirped tilted fiber grating 12, the high reflective fiber grating 13, the gain fiber 14, the low reflective grating 15, the mode filter 16 and the output stub 17 are sequentially arranged along a light output direction.

Referring to fig. 3, firstly, a highly reflective fiber grating 13 with required parameters is manufactured on an output optical fiber, referring to fig. 4, fig. 4 is an enlarged view of a point a in fig. 2, and then, a chirped and tilted fiber grating 12 corresponding to a center wavelength is manufactured at an input end position of the highly reflective fiber grating 13, and the center wavelength of the chirped and tilted fiber grating 12 is the same as the center wavelength of the highly reflective fiber grating 13.

When the fiber laser works, the highly reflective fiber grating 13 can prevent 99% of signal light from returning, but 1% of the signal light still returns to the chirped and inclined fiber grating 12, and the chirped and inclined fiber grating 12 can also filter 1% of signal light residue, so that 0.99% of the signal light is prevented from returning, and only 0.01% of the signal light returns to the pumping source, so that the pumping source is protected better.

The preparation of the grating can be processed by laser, and the preparation of the mode filter can be used for preparing the mode filter on the surface of the bare fiber part in an etching mode, and the mode filter can also filter cladding light.

It can be seen from the above that, in the present disclosure, by means of the way that the chirped tilted fiber grating and the highly reflective fiber grating are sequentially arranged, the highly reflective fiber grating is utilized to provide a high reflection function for the laser resonant cavity, and meanwhile, the chirped tilted fiber grating can filter out signal light that cannot be reflected by the highly reflective fiber grating, so as to further protect the pumping source.

Claims (2)

1. A fiber laser based on a fiber grating protection pump source comprises a pump source, an output fiber and an output head, wherein the output fiber is connected between the pump source and the output head, and part of the output fiber is wound to form a gain fiber;

the method is characterized in that:

the output optical fiber is provided with a chirped and tilted fiber grating, a high reflection fiber grating, a low reflection grating and a mode filter, and the pumping source, the chirped and tilted fiber grating, the high reflection fiber grating, the gain optical fiber, the low reflection grating, the mode filter and the output head are sequentially arranged along the optical output direction.

2. The fiber laser of claim 1, wherein:

the center wavelength of the chirped and inclined fiber grating is the same as that of the highly reflective fiber grating.

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