CN105826802A - Cladding light stripper for optical fiber lasers and making method thereof - Google Patents
Cladding light stripper for optical fiber lasers and making method thereof Download PDFInfo
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- CN105826802A CN105826802A CN201610325257.3A CN201610325257A CN105826802A CN 105826802 A CN105826802 A CN 105826802A CN 201610325257 A CN201610325257 A CN 201610325257A CN 105826802 A CN105826802 A CN 105826802A
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- optical fiber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a cladding light stripper for optical fiber lasers and a making method thereof. The stripper comprises a cladding optical fiber, multiple optical gratings, and a cooling tube sleeve. The making method comprises the following steps: coating the outer surface of a bare optical fiber inner cladding with ultraviolet photoresist of which the refractive index is greater than or equal to that of the inner cladding; etching multiple gratings on the ultraviolet photoresist, and stripping out the residual light in the inner cladding through diffraction of the multiple gratings; and sleeving the finished multiple gratings in a metal tube, and sealing the metal tube with a sealing sleeve, wherein the wall of the metal tube is fully covered with a heat absorption material which absorbs the light stripped from the inner cladding, and circulating cooling water is fed to take away the generated heat. The light transmittance of the cladding light is adjusted by gratings of different structures so as to achieve the purpose of efficient and uniform light stripping, avoid overheated spots of the stripper and ensure high stability of optical fibers. The stripper has the characteristics of simple structure, wide applicability, high reliability, and the like.
Description
Technical field
Patent of the present invention belongs to optical fiber laser field, relates to a kind of device of covering residual light stripping for high-capacity optical fiber laser and preparation method thereof.
Background technology
In recent years, development along with high-capacity optical fiber laser, the power of optical fiber laser constantly rises, and high-capacity optical fiber laser has become as a kind of widely used industrial processes laser instrument, and the requirement to its beam quality and the stability of system is the strictest.
In fiber ring laser system, impact due to nonlinear effect, the long enough that gain fibre can not do, this directly results in the inner cladding of doubly clad optical fiber and has remained certain pump light, in high-capacity optical fiber laser, this power can reach hectowatt grade, the spontaneous emission light (ASE) the most also produced during gain fibre work, and is leaked to the flashlight of optical fiber inner cladding during fused fiber splice.These residual light are transmitted in optical fiber inner cladding, if not being stripped clean, will reduce the beam quality of optical fiber laser, the device in link after fiber laser system is produced the biggest harm.
Divesting of the inner cladding residual light of doubly clad optical fiber, most straightforward approach is that directly on exposed inner cladding, coating height reflects ultraviolet glue, owing to being coated with the refractive index photoresist more than inner cladding refractive index, destroy the condition of total reflection between surrounding layer in optical fiber and make inner cladding light reveal, thus from inner cladding derivation residual light energy.But, this kind of method can leak out in the front end of detacher due to the sudden change of cladding structure, substantial amounts of light, produces substantial amounts of heat, and the temperature usually making front end is too high, thus the performance that significantly limit cladding light detacher puies forward a step and improves.
Summary of the invention
The invention provides a kind of for optical fiber laser covering detacher and preparation method thereof, aim at the purpose that the efficient uniform of light is peeled off in optical fiber laser covering, solve high-power residual light in covering in detacher, to concentrate leakage, the technical problems such as heat spot occur, improve the performance of optical fiber laser covering detacher further.
The covering detacher technical scheme that the present invention proposes, including doubly clad optical fiber, it is characterised in that also include multistage grating and cooling pipe box；Wherein:
Described doubly clad optical fiber is doubly clad optical fiber, including fibre core, inner cladding, surrounding layer and coat；
Described multistage grating is at optical fiber interval or continuous arrangement；Each section of grating peel off surrounding layer doubly clad optical fiber exposed inner cladding outer surface circumferentially；Described grating forms by circumferentially coating, at optical fiber inner cladding outer surface, the high-index material that a layer thickness is 400-600 μm；Described high-index material is the ultraviolet photoresist that refractive index is more than or equal to optical fiber inner cladding refractive index.
Described cooling pipe box is hollow metal sleeve, and in pipe, circulation has deionization to cool down water, for the light energy derived at each section of grating being taken away；
Described doubly clad optical fiber from cooling tube set axially across, its part in cooling jacket is to make to have the doubly clad optical fiber of multistage grating；
Cooling jacket and the junction of doubly clad optical fiber, be provided with sealing shroud, for preventing the cladding light derived from leaking and cooling down the spilling of water.
Further, each section of grating has different screen periods, the degree of depth or dutycycles, and its axial section pattern can be rectangular raster, sinusoidal grating or triangular grating；In described multistage grating, each section of grating is not of uniform size to the transmitance of light, specifically determines by the order of the internal ascending arrangement of cladding light transmitance.By adjusting screen periods, the degree of depth and dutycycle these three parameter, affect the diffraction efficiency that grating is at different levels, thus change the transmitance of inner cladding light.
Further, the fiber core refractive index of described doubly clad optical fiber is more than the refractive index of inner cladding, and the refractive index of inner cladding is more than the refractive index of surrounding layer, and the refractive index of surrounding layer is less than the refractive index of coat.
Further, the grating quantity of described multistage grating is 3-10.
Further, the grid ridge refractive index of described each section of grating is identical with the refractive index of grating substrate, and the refractive index of the two is more than or equal to the refractive index of optical fiber inner cladding.
Further, on described exposed inner cladding, the ultraviolet photoresist of coating is the light transmissive material that refractive index is more than or equal to inner cladding refractive index.
Further, described cooling jacket inwall is provided with internal cladding light and has the material of high-selenium corn, including graphite, copper or anodized aluminum.
Further, the high-index material thickness that described optical fiber inner cladding outer surface circumferentially coats is 500 μm.
Correspondingly, the present invention also proposes the covering detacher manufacture method of a kind of optical fiber laser, comprises the steps::
(1) coat and the surrounding layer of doubly clad optical fiber one segment length being removed, at the outer surface of doubly clad optical fiber inner cladding, coating refractive index is more than or equal to the ultraviolet photoresist of inner cladding refractive index；
(2) grating diffration efficiency is calculated, by changing the parameters such as the cycle of grating, the degree of depth, dutycycle, adjust grating diffration efficiency, select multistage parameter different (different be exactly before the difference of described three parameters of grating, the difference of parameter, grating diffration efficiency is therefore different), the grating parameter that diffraction efficiency does not waits, in order to control to separate the ratio of inner cladding light；Utilize ultraviolet photoresist good coated by litho machine etching (1), obtain the different grating of designed multistage parameter and grating substrate；Cycle, the degree of depth, dutycycle these three parameter are the principal elements affecting efficiency, can choose preferential which parameter of adjustment according to practical situation；Grating diffration efficiency calculation can use rigorous couple-wave analysis method；
(3) by the doubly clad optical fiber obtained by step (2) from cooling tube set axially across, the deionization cooling water circulated it is passed through in cooling jacket, in the junction of cooling jacket Yu doubly clad optical fiber, sealing set is set to prevent the cladding light derived from leaking and cooling down the spilling of water.
In the present invention, residual light in doubly clad optical fiber inner cladding can be produced the different order of diffraction time and different transmitances by multistage optical grating diffraction, be progressively coupled out optical fiber inner cladding through grating substrate, absorbed by the absorbing material of metal pipe-wall, by the cooling water in metal tube, the heat of generation is taken away.
Due to the fact that and have employed multistage grating, the grating transmitance to optical fiber inner cladding residual light can be adjusted by the structure changing grating, therefore the multistage grating of different structure is used, diverse location can be controlled easily and separate the watt level of optical fiber inner cladding residual light, reach the purpose that efficient uniform is peeled off, avoid detacher occurs heat spot, it is ensured that the high reliability of optical fiber, improve the ability of detacher.
Accompanying drawing explanation
Fig. 1 is the structural representation of the cladding light detacher of optical fiber laser of the present invention；
The section pattern schematic diagram that Fig. 2 is used by grating in the cladding light detacher of optical fiber laser of the present invention；
Fig. 3 is the enforcement illustration of the cladding light detacher of optical fiber laser of the present invention.
In all of the figs, identical reference is used for representing identical element or structure, wherein: 1 doubly clad optical fiber, 2 inner claddings, 3 metal tubes, 4 grating substrate, 5 multistage gratings, 6 absorbers, 7 surrounding layers and coat, 8 sealing shrouds, 9 grating grid ridges, 10 CO2 laser instrument, 11 photo-couplers, 12 thermal camera, 13 cladding light detachers, 14 light power meters.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of invention described below does not constitutes conflict each other.
Below in conjunction with accompanying drawing, the present invention is further detailed, but should not limit the scope of the invention with this.
With reference to Figure of description, Fig. 1 is the overall structure schematic diagram of the present invention, as it can be seen, the cladding light detacher of the present invention is characterised by including doubly clad optical fiber, multistage grating and cooling pipe box, doubly clad optical fiber therein is common doubly clad optical fiber；Multistage grating is at optical fiber interval or continuous arrangement；Each section of grating peel off surrounding layer doubly clad optical fiber exposed inner cladding outer surface circumferentially；Described grating forms by circumferentially coating high-index material at optical fiber inner cladding outer surface；Doubly clad optical fiber inner cladding residual light can be produced the transmitance arranged from small to large by multistage optical grating diffraction, inner cladding residual light be coupled out optical fiber inner cladding equably through grating substrate；Cooling pipe box is hollow metal sleeve, and in pipe, circulation has deionization to cool down water, for the light energy derived at each section of grating being taken away；Described doubly clad optical fiber from cooling tube set axially across, its part in cooling jacket is to make to have the doubly clad optical fiber of multistage grating；Cooling jacket and the junction of doubly clad optical fiber, be provided with sealing shroud, for preventing the cladding light derived from leaking and cooling down the spilling of water.
The manufacture method of described cladding light detacher comprises the following steps:
(1) coat that doubly clad optical fiber one segment length is 15cm and the surrounding layer of selection are divested, expose optical fiber inner cladding；
(2) grating diffration efficiency is calculated, by changing the parameters such as the cycle of grating, the degree of depth, dutycycle, adjust grating diffration efficiency, select multistage parameter different, the grating parameter that diffraction efficiency does not waits, in order to control to separate the ratio of inner cladding light.The present embodiment have chosen three sections of different gratings of parameter, the grating chosen is rectangular raster, if Fig. 2 is the generalized section of grating, the wherein cycle of grating one, the degree of depth and dutycycle are respectively (5 μm, 2 μm, 0.5), the cycle of grating two, the degree of depth and dutycycle are respectively (10 μm, 2 μm, 0.5), the cycle of grating three, the degree of depth and dutycycle are respectively (15 μm, 2 μm, 0.5), in the present embodiment, the purpose of diffraction efficiency of grating can be reached to change by changing screen periods, problem for the purpose of simplifying the description, do not change the degree of depth and dutycycle.Using rigorous couple-wave analysis method, the transmitance being calculated three is respectively 0.3,0.5,0.7, is arranged in order grating one, grating two, grating three by the transmission direction of doubly clad optical fiber inner cladding light.Coating ultraviolet light photoresist on exposed inner cladding, utilizes litho machine etching photoresist to obtain designed multistage grating, or is sticked on exposed inner cladding by the multistage grating etched.
(3) optical fiber abovementioned steps made and grating, entangle and good seal with metal tube, passes to cool down water.
Embodiment: Fig. 2 is the enforcement illustration of the doubly clad optical fiber inner cladding photospallation device of the present invention, as it can be seen, the present invention is applied to the outfan of high-capacity optical fiber laser, the core diameter of the doubly clad optical fiber 13 used is 20 μm, and inner cladding is 400 μm.The laser of the wavelength 915nm being sent 100 watts by semiconductor laser elements 11 is coupled into doubly clad optical fiber 13 by photo-coupler 12, by the cladding light detacher 15 made, by inner cladding photospallation out, the cooling water of 20 DEG C is passed in metal pipe mouth, flow is more than 1 liter/min, make cladding light detacher cool down, monitor whole process with thermal camera 14 and power detection meter 16.Experiment shows, overheated situation does not occur in double clad fiber cladding photospallation device, and temperature is less than 40 DEG C, and the cladding light power overwhelming majority is stripped out covering, and peeling effect reaches more than 10dB.
Due to the fact that and have employed multistage grating, the grating transmitance to covering residual light can be adjusted by the structure changing grating, therefore the multistage grating using different structure can control diverse location easily and separate the watt level of optical fiber inner cladding residual light, reach the purpose that efficient uniform is peeled off, avoid detacher occurs heat spot, ensure the high reliability of optical fiber, have that simple in construction, the suitability be wide, reliability high.
Those skilled in the art is easy to understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (10)
1. for a cladding light detacher for optical fiber laser, including doubly clad optical fiber, it is characterised in that also include multistage grating and cooling pipe box；Wherein:
Described doubly clad optical fiber is doubly clad optical fiber, including fibre core, inner cladding, surrounding layer and coat；
Described multistage grating is at optical fiber interval or continuous arrangement；Each section of grating peel off surrounding layer doubly clad optical fiber exposed inner cladding outer surface circumferentially；Described grating forms by circumferentially coating, at optical fiber inner cladding outer surface, the high-index material that a layer thickness is 400-600 μm；Described high-index material is the ultraviolet photoresist that refractive index is more than or equal to optical fiber inner cladding refractive index.
Described cooling pipe box is hollow metal sleeve, and in pipe, circulation has deionization to cool down water, for the light energy derived at each section of grating being taken away；
Described doubly clad optical fiber from cooling tube set axially across, its part in cooling jacket is to make to have the doubly clad optical fiber of multistage grating；
Cooling jacket and the junction of doubly clad optical fiber, be provided with sealing shroud, for preventing the cladding light derived from leaking and cooling down the spilling of water.
2. photospallation device as claimed in claim 1, it is characterised in that each section of grating has different screen periods, the degree of depth or dutycycles, and its axial section pattern can be rectangular raster, sinusoidal grating or triangular grating；In described multistage grating, each section of grating is not of uniform size to the transmitance of light, specifically determines by the order of the internal ascending arrangement of cladding light transmitance.
3. photospallation device as claimed in claim 1 or 2, it is characterised in that the fiber core refractive index of described doubly clad optical fiber is more than the refractive index of inner cladding, and the refractive index of inner cladding is more than the refractive index of surrounding layer, and the refractive index of surrounding layer is less than the refractive index of coat.
4. photospallation device as claimed in claim 1 or 2, it is characterised in that the grating quantity of described multistage grating is 3-10.
5. photospallation device as claimed in claim 1 or 2, it is characterised in that each section of grating can be sub-wave length grating can also be non-sub-wave length grating.
6. photospallation device as claimed in claim 1 or 2, it is characterised in that the grid ridge refractive index of each section of grating is identical with the refractive index of grating substrate, and the refractive index of the two is more than or equal to the refractive index of optical fiber inner cladding.
7. photospallation device as claimed in claim 1 or 2, it is characterised in that on exposed inner cladding, the ultraviolet photoresist of coating is the light transmissive material that refractive index is more than or equal to inner cladding refractive index.
8. photospallation device as claimed in claim 1 or 2, it is characterised in that described cooling jacket inwall is provided with internal cladding light and has the material of high-selenium corn, including graphite, copper or anodized aluminum.
9. the photospallation device as described in claim 1-8, it is characterised in that the high-index material thickness that described optical fiber inner cladding outer surface circumferentially coats is 500 μm.
10. a covering detacher manufacture method for optical fiber laser, comprises the steps:
(1) coat and the surrounding layer of doubly clad optical fiber one segment length being removed, at the outer surface of doubly clad optical fiber inner cladding, coating refractive index is more than or equal to the ultraviolet photoresist of inner cladding refractive index；
(2) grating diffration efficiency is calculated, by changing the parameters such as the cycle of grating, the degree of depth, dutycycle, adjust grating diffration efficiency, select multistage parameter different, the grating parameter that diffraction efficiency does not waits, in order to control to separate the ratio of inner cladding light；Utilize ultraviolet photoresist good coated by litho machine etching (1), obtain the different grating of designed multistage parameter and grating substrate；
(3) by the doubly clad optical fiber obtained by step (2) from cooling tube set axially across, the deionization cooling water circulated it is passed through in cooling jacket, in the junction of cooling jacket Yu doubly clad optical fiber, sealing set is set to prevent the cladding light derived from leaking and cooling down the spilling of water.
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| CN201610325257.3A CN105826802B (en) | 2016-05-17 | 2016-05-17 | A kind of cladding light stripper and preparation method thereof for optical fiber laser |
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| CN201610325257.3A CN105826802B (en) | 2016-05-17 | 2016-05-17 | A kind of cladding light stripper and preparation method thereof for optical fiber laser |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107453192A (en) * | 2017-08-09 | 2017-12-08 | 西南技术物理研究所 | A kind of high-capacity optical fiber laser liquid cooling heat radiation system |
| CN109921270A (en) * | 2019-05-06 | 2019-06-21 | 中国工程物理研究院激光聚变研究中心 | A kind of covering power device for stripping and laser |
| CN110768090A (en) * | 2019-10-28 | 2020-02-07 | 佛山市宝光新宇实业有限公司 | Optical fiber cladding light stripping structure with simple structure |
| CN110808527A (en) * | 2019-10-31 | 2020-02-18 | 武汉锐科光纤激光技术股份有限公司 | Cladding light stripping device and processing method thereof |
| CN110957629A (en) * | 2019-12-17 | 2020-04-03 | 深圳光韵达光电科技股份有限公司 | Optical fiber cladding light removing device |
| CN111029891A (en) * | 2020-01-10 | 2020-04-17 | 华东师范大学重庆研究院 | Laser gain optical fiber heat dissipation device |
| CN111854962A (en) * | 2020-06-08 | 2020-10-30 | 浙江大华技术股份有限公司 | Thermal imaging human body temperature measurement method, device and system and electronic equipment |
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| CN110768090A (en) * | 2019-10-28 | 2020-02-07 | 佛山市宝光新宇实业有限公司 | Optical fiber cladding light stripping structure with simple structure |
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| CN111029891A (en) * | 2020-01-10 | 2020-04-17 | 华东师范大学重庆研究院 | Laser gain optical fiber heat dissipation device |
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| US11621534B2 (en) * | 2020-01-10 | 2023-04-04 | Chongqing Institute Of East China Normal University | Laser gain optical fiber heat-dissipating device |
| CN111854962A (en) * | 2020-06-08 | 2020-10-30 | 浙江大华技术股份有限公司 | Thermal imaging human body temperature measurement method, device and system and electronic equipment |
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