CN218003773U

CN218003773U - Fiber laser pumping source coupling tail fiber with function of stripping cladding light

Info

Publication number: CN218003773U
Application number: CN202221754582.9U
Authority: CN
Inventors: 潘祥韬; 何明民; 覃程远
Original assignee: Shenzhen Fujin Photoelectric Technology Co ltd
Current assignee: Shenzhen Fujin Photoelectric Technology Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-12-09
Anticipated expiration: 2032-07-07

Abstract

The utility model discloses a fiber laser pumping source coupling tail fiber with the function of stripping cladding light, which comprises an optical fiber body, wherein the optical fiber body comprises a glass fiber core layer, a glass cladding layer and an epoxy resin coating layer from inside to outside; the optical fiber comprises an optical fiber body, wherein an epoxy resin coating layer at one part of area on the optical fiber body is stripped, the area is a cladding area, a ceramic sleeve is sleeved outside the optical fiber body, the cladding area is positioned in the ceramic sleeve, a glass cladding positioned in the cladding area is provided with etching spots, the etching spots can destroy the total reflection condition of the glass cladding and an air interface, and the cladding area is refracted out due to the fact that the cladding area transmits light in the morning but does not meet the total reflection condition. The utility model discloses an increasing cladding light at the coupling end of pump laser tail optical fiber and peeling off the function, cladding light is peeled off in this region, and cladding light is absorbed the transmission by ceramic sleeve, finally all realizes that light energy converts to heat energy and conducts the metal casing of pump laser on, accomplishes the heat dissipation to effectively cool down and avoid appearing burning fine phenomenon.

Description

Fiber laser pumping source coupling tail fiber with function of stripping cladding light

Technical Field

The utility model relates to an optical fiber processing technology field specifically is an optical fiber laser pumping source coupling tail optical fiber with strip covering light function.

Background

The existing high-power fiber laser (wavelength 1064 nm) is realized by pumping an active fiber containing doped rare earth after a plurality of high-power semiconductor lasers (wavelength 915nm or 976 nm) are combined (as shown in fig. 1). At present, fiber lasers are widely used in the field of industrial processing, and the requirements for the output power of the fiber lasers are higher and higher, so that the requirements for the power of a pumping source are higher and higher. Besides the high power, the pump source also ensures high brightness (power density), so the core diameter of the coupling tail fiber of the pump source needs to be kept within 200 um.

Due to the limitations of optical coupling technology, it is currently impossible to couple 100% of the laser light in the pump source into the core, and a part of the light will be coupled into the cladding of the optical fiber, which is called cladding light. The cladding light generally travels back along the pigtail and is intensively stripped at the combiner position, and the stripped cladding light is converted into heat in the future, which brings great temperature rise pressure to the combiner. If the cladding light is gradually released along the tail fiber of the pump source, the overall temperature of the tail fiber of the pump source is also increased, and fiber burning is caused in severe cases.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fiber laser pumping source coupling tail optical fiber with strip covering optical function to strip covering optical fiber and become heat energy and derive through increasing at fiber coupling end, strip covering optical fiber in pumping laser casing inside.

In order to achieve the above object, the utility model provides a following technical scheme:

a pumping source coupling tail fiber of a fiber laser with a function of stripping cladding light comprises a fiber body, wherein the fiber body comprises a glass fiber core layer, a glass cladding layer and an epoxy resin coating layer from inside to outside; the optical fiber comprises an optical fiber body, wherein an epoxy resin coating layer is stripped from one part of the optical fiber body, the part of the optical fiber body is a cladding region, a ceramic sleeve is sleeved on the outer side of the optical fiber body, the cladding region is positioned in the ceramic sleeve, the ceramic sleeve can absorb cladding light and conduct heat, etching spots are arranged on a glass cladding of the optical fiber body in the cladding region, the etching spots can destroy the total reflection condition of the glass cladding and an air interface, and light transmitted in the cladding region cannot meet the total reflection condition and is refracted out of the cladding region.

On the basis of the technical scheme, the utility model discloses still provide following optional technical scheme:

in one alternative: the etching spots are rough in surface and irregular in shape, and have optical scattering conditions.

In one alternative: between the bare portion of the glass cladding in the region of the ceramic sleeve and the ceramic sleeve there is a cured layer and the cured layer is used to fix the cladding region inside the ceramic sleeve.

In one alternative: the curing layer is cured by coating ultraviolet glue at the etching spots, and the ultraviolet glue and the end part of the ceramic sleeve keep a glue-free distance of more than 0.5 mm.

In one alternative: the ceramic bushing is a zirconia or alumina ceramic bushing.

In one alternative: an optical antireflection film is arranged at the end face of the optical fiber body.

In one alternative: the junction of ceramic sleeve tip and optic fibre body has soft silica gel, soft silica gel installs at ceramic sleeve tip.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model discloses an it strips the function to increase cladding light at the coupling end of pump laser tail optical fiber, and cladding light is stripped in this region, and partial cladding light is absorbed by ceramic sleeve, and the part transmits ceramic sleeve, finally all realizes that light energy conversion becomes heat energy conduction to pump laser's metal casing on, accomplishes the heat dissipation, and laser in the fibre core continues to transmit to the back not influenced to effectively cool down and avoid appearing burning fine phenomenon.

Drawings

Fig. 1 is a schematic diagram of a fiber laser.

Fig. 2 is a schematic view of the tail fiber structure of the present invention.

FIG. 3 is a schematic view of the etching process for the surface of the optical fiber according to the present invention.

Fig. 4 is a schematic structural diagram of the tail fiber of the present invention.

Notations for reference numerals: a fiber body 1, a cladding region 2, a ceramic sleeve 4, soft silica gel 5, a cured layer 6, and etched spots 21.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments; in the drawings or the description, the same reference numerals are used for similar or identical parts, and the shape, thickness or height of each part may be enlarged or reduced in practical use. The embodiments of the present invention are provided only for illustration, and not for limiting the scope of the present invention. Any obvious and obvious modifications or alterations to the present invention can be made without departing from the spirit and scope of the present invention.

In one embodiment, as shown in fig. 2 and 3, a pump source coupling pigtail of a fiber laser with a function of removing cladding light comprises a fiber body 1, wherein the fiber body 1 comprises a glass fiber core layer 11, a glass cladding layer 12 and an epoxy resin coating layer 13 from inside to outside; the optical fiber comprises an optical fiber body 1, wherein an epoxy resin coating layer 13 of a partial region of the optical fiber body 1 is stripped, the region is a cladding region 2, a ceramic sleeve 4 is sleeved outside the optical fiber body 1, the cladding region 2 is positioned inside the ceramic sleeve 4, the ceramic sleeve 4 can absorb cladding light and conduct heat, etching spots 21 are arranged on a glass cladding 12 of the optical fiber body 1 in the cladding region 2, the etching spots 21 can destroy the total reflection condition of the glass cladding 12 and an air interface, and light can not meet the total reflection condition and is refracted out of the cladding region 2;

in this embodiment, a cladding light stripping function is added to the coupling end of the pump laser pigtail, in which the total reflection condition of the cladding region 2 and the air interface is destroyed in the cladding region 2 region by the etching spots 21 on the surface of the cladding region 2, so that the light propagating in the cladding does not satisfy the total reflection condition and is refracted out of the cladding region 2; one part of cladding light is absorbed by the ceramic sleeve 4, and the other part of cladding light is transmitted out of the ceramic sleeve 4, so that the light energy is converted into heat energy and is transmitted to a metal shell of the pump laser to finish heat dissipation, and the laser in the fiber core is continuously transmitted backwards without being influenced;

in one embodiment, as shown in fig. 2 and 3, the etching spots 21 have a rough surface and irregular shape; in the present embodiment, the shape of the etching spot 21 is irregular to realize multi-directional scattering of cladding light.

In one embodiment, as shown in fig. 2, there is a solidified layer 6 between the portion of the fiber body 1 of the cladding region 2 and the ceramic ferrule 4 and the solidified layer 6 is used to fix the cladding region 2 inside the ceramic ferrule 4; the curing layer 6 is cured by coating light-transmitting ultraviolet glue on the etching spots 21, so that the curing firmness can be ensured, and the distance between the light-transmitting ultraviolet glue and the end part of the ceramic sleeve 4 is kept to be more than 0.5mm, thereby avoiding the glue from being invalid due to direct irradiation of laser; the end part of the cladding region 2 is a proper length away from the front end of the ceramic sleeve 4, so that the end face of the cladding region 2 is prevented from being polluted by glue, the cladding region 2 protruding out of the front end of the ceramic sleeve 4 is not etched, and the cladding region 2 at the front end of the ceramic sleeve 4 is prevented from being easily brittle-broken;

in one embodiment, as shown in fig. 2, the ceramic bushing 4 is a zirconia or alumina ceramic bushing, the zirconia or alumina having high toughness, high bending strength and high wear resistance; the security at the cladding region 2 can be ensured.

In one embodiment, as shown in fig. 2, the optical fiber body 1 has an optical antireflection film at the end face, so that the laser coupling efficiency can be effectively improved;

in one embodiment, as shown in fig. 2, the connection between the end of the ceramic sleeve 4 and the optical fiber body 1 is provided with a soft silica gel 5, and the soft silica gel 5 is mounted at the end of the ceramic sleeve 4; the soft silica gel 5 can protect the optical fiber body 1, and the optical fiber body 1 is prevented from being broken due to external force.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present disclosure, and shall cover the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A pumping source coupling tail fiber of an optical fiber laser with a function of stripping cladding light comprises an optical fiber body, wherein the optical fiber body comprises a glass fiber core layer, a glass cladding layer and an epoxy resin coating layer from inside to outside; the optical fiber is characterized in that a part of area on the optical fiber body is stripped with an epoxy resin coating, the area is a cladding area, a ceramic sleeve is sleeved outside the optical fiber body, the cladding area is positioned inside the ceramic sleeve, the ceramic sleeve can absorb cladding light and conduct heat, etching spots are arranged on a glass cladding of the optical fiber body in the cladding area, the etching spots can damage the total reflection condition of the glass cladding and an air interface, and light transmitted in the cladding area cannot meet the total reflection condition and is refracted out of the cladding area;

a solidified layer is arranged between the exposed part of the glass cladding of the ceramic sleeve area and the ceramic sleeve and is used for fixing the cladding area in the ceramic sleeve;

an optical antireflection film is arranged at the end face of the optical fiber body.

2. The fiber laser pump-source coupled pigtail with the function of removing cladding light according to claim 1, wherein the etched spots are rough and irregular in surface and have optical scattering conditions.

3. The fiber laser pump-source coupled pigtail with the function of removing cladding light according to claim 2, wherein the cured layer is cured by applying ultraviolet glue at the etching spots, and the ultraviolet glue is kept at a glue-free distance of more than 0.5mm from the end of the ceramic sleeve.

4. The fiber laser pump source coupling pigtail with the function of stripping cladding light of claim 1, wherein the ceramic sleeve is a zirconia or alumina ceramic sleeve.

5. The fiber laser pump-source coupling pigtail with the function of removing cladding light according to claim 1, wherein the joint of the end of the ceramic sleeve and the fiber body is provided with soft silica gel, and the soft silica gel is mounted at the end of the ceramic sleeve.