CN113783089A - High-conversion-efficiency optical fiber laser - Google Patents
High-conversion-efficiency optical fiber laser Download PDFInfo
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- CN113783089A CN113783089A CN202110959213.7A CN202110959213A CN113783089A CN 113783089 A CN113783089 A CN 113783089A CN 202110959213 A CN202110959213 A CN 202110959213A CN 113783089 A CN113783089 A CN 113783089A
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- optical fiber
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- active
- isolator
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 156
- 239000000835 fiber Substances 0.000 claims abstract description 48
- 230000003287 optical effect Effects 0.000 claims description 55
- 230000003321 amplification Effects 0.000 claims description 18
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 18
- 238000011144 upstream manufacturing Methods 0.000 claims 3
- 230000004927 fusion Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000011160 research Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000007526 fusion splicing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
- H01S3/06754—Fibre amplifiers
Abstract
The invention provides a fiber laser which comprises a preceding-stage light path and a subsequent-stage light path, wherein a seed source, a first isolator, a wavelength division multiplexer and a first active fiber in the preceding-stage light path are sequentially connected through a first matching fiber, and a second isolator, a beam combiner and a second active fiber in the subsequent-stage light path are sequentially connected through a second matching fiber. The first active optical fiber and the second active optical fiber are doped optical fibers of the same type; the seed source output optical fiber, the first isolator input/output optical fiber and the wavelength division multiplexer input/output optical fiber are first matching optical fibers, the second isolator input/output optical fiber and the beam combiner input/output optical fiber are second matching optical fibers, and the first matching optical fiber and the second matching optical fiber are passive optical fibers of the same type; the passive optical fiber is an optical fiber matched with the first active optical fiber and the second active optical fiber with high precision. According to the fiber laser provided by the invention, only two fibers exist in the whole fiber laser, so that the fusion loss among the fibers is reduced, and the operation is simpler and more convenient.
Description
Technical Field
The invention belongs to the technical field of optical fibers, and relates to an optical fiber laser with low insertion loss and high conversion efficiency.
Background
The fiber laser has the characteristics of compact structure, stable performance, high conversion efficiency and the like, and is widely applied to the fields of industrial processing, fiber sensing, laser medical treatment and the like. With the development of fiber lasers, the improvement of the output power of a single fiber becomes the current research hotspot. Therefore, researchers have conducted multi-directional research, but researches mainly focus on the aspects of large mode field optical fiber technology, high power pumping technology, pumping coupling technology and the like, and the researches on matching of optical fiber devices are rarely reported. In fact, in the existing fiber laser structure, the selected optical fiber devices are different among research institutions and companies according to their own conditions, and the diversification of the optical fiber devices causes the fiber laser to have large loss, which is from the insertion loss of the optical fiber devices on the one hand and the connection loss between two optical fibers on the other hand, and the difference of the optical fiber specifications further increases the connection loss of the fiber laser, increasing the operation difficulty of fusion splicing. These losses, while converting into heat to affect the heat dissipation of the laser, cause the loss of pump light and affect the conversion efficiency of the laser. The invention provides a fiber laser, wherein the whole fiber laser only comprises two types of fibers, namely a doped fiber and a non-doped fiber matched with the doped fiber in high precision, so that the problems of multiple types and large loss of the fibers are effectively solved, and the conversion efficiency of the fiber laser is improved.
Disclosure of Invention
The invention provides a fiber laser, which comprises a preceding-stage light path and a subsequent-stage light path, wherein the preceding-stage light path comprises a seed source, a first isolator, a wavelength division multiplexer and a first active fiber which are sequentially connected by a first matching fiber; the optical fiber is characterized in that the first active optical fiber and the second active optical fiber are doped optical fibers of the same type; the seed source output optical fiber, the first isolator input/output optical fiber and the wavelength division multiplexer input/output optical fiber are first matching optical fibers, the second isolator input/output optical fiber and the beam combiner input/output optical fiber are second matching optical fibers, and the first matching optical fiber and the second matching optical fiber are passive optical fibers of the same type; the passive optical fiber is an optical fiber which is matched with the first active optical fiber and the second active optical fiber with high precision.
The seed source is used for providing signal light, and the optical output end of the seed source is connected with the optical input end of the first isolator; the center wavelength and bandwidth of the first isolator are matched with those of the seed source.
The wavelength division multiplexer is used for coupling pump light and seed light, the light input end of the wavelength division multiplexer is connected with the light output end of the first isolator, and the light output end of the wavelength division multiplexer is connected with the first active optical fiber.
The center wavelength and the bandwidth of the second isolator are matched with those of the front-stage light path and are used for isolating the front-stage light path and the rear-stage light path, and the light input end of the second isolator is connected with the front-stage light path.
The beam combiner is used for coupling the pump light and the front stage optical path light, the optical input end of the beam combiner is connected with the optical output end of the second isolator, and the optical output end of the beam combiner is connected with the second active optical fiber.
The fiber laser can comprise a multistage amplification structure, wherein the multistage amplification structure can comprise N amplification light paths, N is larger than or equal to 1 and is similar to a preceding-stage light path and a subsequent-stage light path, an Nth matching optical fiber and an Nth active optical fiber are arranged in the Nth amplification light path, the Nth matching optical fiber is used for connecting devices in the Nth amplification light path, and the Nth active optical fiber is used for amplifying laser. In order to further reduce the insertion loss in the optical path and improve the optical conversion efficiency of the optical fiber laser, the Nth matched optical fiber, the first matched optical fiber and the second matched optical fiber are passive optical fibers of the same type; the Nth active optical fiber, the first active optical fiber and the second active optical fiber are doped optical fibers of the same type; the passive optical fiber is an optical fiber which is matched with the first active optical fiber, the second active optical fiber and the Nth active optical fiber with high precision.
The optical fiber laser provided by the invention has the following advantages.
The optical fiber devices are connected by using the same passive optical fiber, so that the matching performance among the passive devices is improved;
the passive optical fiber and the active optical fiber are high-precision matched optical fibers, so that high matching between the passive device and the active optical fiber is guaranteed, and the coupling efficiency is improved;
the whole fiber laser only has two fibers, so that the fusion loss between the fibers is reduced, and the operation is simpler and more convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a high conversion efficiency laser according to an embodiment of the present invention.
In the figure, 1 is a seed source, 2 is a first isolator, 3 is a wavelength division multiplexer, 4 is a first active optical fiber, 5 is a second isolator, 6 is a beam combiner, and 7 is a second active optical fiber.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a structural view of a fiber laser in an embodiment of the present invention. As shown in fig. 1, the optical fiber laser in this embodiment includes a preceding optical path and a following optical path, where the preceding optical path includes a seed source 1, a first isolator 2, a wavelength division multiplexer 3, and a first active optical fiber 4, and the following optical path includes a second isolator 5, a beam combiner 6, and a second active optical fiber 7. The optical output end of the seed source 1 is connected with the optical input end of the first isolator 2, the optical output end of the first isolator 2 is connected with the optical input end of the wavelength division multiplexer 3, and the optical output end of the wavelength division multiplexer 3 is connected with the first active optical fiber 4 to form a preceding stage optical path. The optical input end of the second isolator 5 is connected with the optical output end of the preceding stage optical path, the optical output end of the second isolator 5 is connected with the optical input end of the beam combiner 6, and the optical output end of the beam combiner 6 is connected with the second active optical fiber 7.
In this embodiment, the center wavelength and bandwidth of the first isolator 2 and the second isolator 5 are matched with those of the seed source, so as to isolate the reflected light, and the passing laser light is transmitted in a single direction.
The output optical fiber of the seed source 1, the input/output optical fiber of the first isolator 2, the input/output optical fiber of the wavelength division multiplexer 3, the input/output optical fiber of the second isolator 5 and the input/output optical fiber of the beam combiner are all passive optical fibers of the same type; the first active optical fiber 4 and the second active optical fiber 7 are the same type of optical fiber; the passive optical fiber is an optical fiber matched with the first active optical fiber 4 and the second active optical fiber 7 with high precision. Therefore, only two optical fibers exist in the whole optical fiber laser, the problem of large loss caused by multiple types of optical fibers is effectively solved, and the optical conversion efficiency of the optical fiber laser is improved.
The working principle of the fiber laser in this embodiment is as follows: laser signal light provided by the seed source 1 enters the first isolator 2, the central wavelength and the bandwidth of the first isolator 2 are matched with those of the seed source, and the isolator has a one-way conduction function and is used for isolating reflected light and preventing the reflected light from entering the seed source to damage the seed source. The wavelength division multiplexer 3 optically couples the pump light and the signal light into the first active fiber 4. The seed source 1, the first isolator 2, the wavelength division multiplexer 3 and the first active optical fiber 4 form a preceding stage light path of the optical fiber laser, and the preceding stage light path is used as first-stage amplification of the laser. The second isolator 5 has a unidirectional conduction function as the first isolator 2 and is used for isolating a preceding-stage optical path from a subsequent-stage optical path, and the beam combiner 6 couples the light of the preceding-stage optical path and the pump light into the second active optical fiber 7 by using a (2 + 1) × 1 optical fiber beam combiner. The second isolator 5, the beam combiner 6 and the second active fiber 7 form a rear-stage optical path of the fiber laser, and are used as secondary amplification of the laser.
In this embodiment, the fiber laser employs a two-stage amplification structure, and in fact, the fiber laser may perform more than two-stage amplification. For example, the optical fiber laser may further include a multi-stage amplification structure in addition to the preceding-stage optical path and the subsequent-stage optical path in embodiment 1, where the multi-stage amplification structure may include N amplification optical paths, N is greater than or equal to 1, and is similar to the preceding-stage optical path and the subsequent-stage optical path, an nth matching optical fiber and an nth active optical fiber are disposed in the nth amplification optical path, the nth matching optical fiber is used to connect devices in the nth amplification optical path, and the nth active optical fiber is used to amplify laser light. In order to further reduce the insertion loss in the optical path and improve the optical conversion efficiency of the optical fiber laser, the Nth matched optical fiber, the first matched optical fiber and the second matched optical fiber are passive optical fibers of the same type; the Nth active optical fiber, the first active optical fiber and the second active optical fiber are doped optical fibers of the same type; the passive optical fiber is an optical fiber which is matched with the first active optical fiber, the second active optical fiber and the Nth active optical fiber with high precision.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A fiber laser comprises a preceding-stage light path and a subsequent-stage light path, wherein the preceding-stage light path comprises a seed source, a first isolator, a wavelength division multiplexer and a first active fiber which are sequentially connected by a first matching fiber, and the subsequent-stage light path comprises a second isolator, a beam combiner and a second active fiber which are sequentially connected by a second matching fiber; the optical fiber is characterized in that the first active optical fiber and the second active optical fiber are doped optical fibers of the same type; the seed source output optical fiber, the first isolator input/output optical fiber and the wavelength division multiplexer input/output optical fiber are first matching optical fibers, the second isolator input/output optical fiber and the beam combiner input/output optical fiber are second matching optical fibers, and the first matching optical fiber and the second matching optical fiber are passive optical fibers of the same type; the passive optical fiber is an optical fiber matched with the first active optical fiber and the second active optical fiber.
2. A fibre laser as claimed in claim 1, wherein the seed source is arranged to provide signal light, the optical output of which is connected to the optical input of the first isolator; the center wavelength and bandwidth of the first isolator are matched with those of the seed source.
3. A fibre laser as claimed in claim 1, wherein the wavelength division multiplexer is arranged to couple pump light and seed light, an optical input of the wavelength division multiplexer being connected to the first isolator optical output, and an optical output of the wavelength division multiplexer being connected to the first active fibre.
4. A fibre laser as claimed in claim 1, wherein the second isolator has a centre wavelength and bandwidth matched to the upstream optical path for isolating the upstream optical path from the downstream optical path, the second isolator optical input being connected to the upstream optical path.
5. A fibre laser as claimed in claim 1, wherein the combiner is arranged to couple pump light to prior-stage optical fibre, the optical input of the combiner being connected to the optical output of the second isolator, and the optical output of the combiner being connected to the second active optical fibre.
6. The optical fiber laser device according to any one of claims 1 to 5, further comprising a multi-stage amplification structure in addition to the front stage optical path and the rear stage optical path, wherein the multi-stage amplification structure comprises N amplification optical paths, N is greater than or equal to 1, the Nth amplification optical path comprises an Nth matching optical fiber and an Nth active optical fiber, and the Nth matching optical fiber is a passive optical fiber of the same type as the first matching optical fiber and the second matching optical fiber; the Nth active optical fiber, the first active optical fiber and the second active optical fiber are doped optical fibers of the same type; the passive optical fiber is an optical fiber matched with the first active optical fiber, the second active optical fiber and the Nth active optical fiber.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110959213.7A CN113783089A (en) | 2021-08-20 | 2021-08-20 | High-conversion-efficiency optical fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110959213.7A CN113783089A (en) | 2021-08-20 | 2021-08-20 | High-conversion-efficiency optical fiber laser |
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| Publication Number | Publication Date |
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| CN113783089A true CN113783089A (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110959213.7A Pending CN113783089A (en) | 2021-08-20 | 2021-08-20 | High-conversion-efficiency optical fiber laser |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202373839U (en) * | 2011-12-15 | 2012-08-08 | 华南理工大学 | Multistage cascading type 1064nm band high-power active seeker electronics (ASE) light source |
| CN104659639A (en) * | 2013-11-21 | 2015-05-27 | 上海瀚宇光纤通信技术有限公司 | High-power optical fiber amplifier with high heat dissipation rate |
| CN104852261A (en) * | 2015-06-05 | 2015-08-19 | 中国人民解放军国防科学技术大学 | High-power all-fiber MOPA structure superfluorescence fiber light source based on tandem pumping |
| US9905989B1 (en) * | 2016-07-25 | 2018-02-27 | Bae Systems Information And Electronic Systems Integration Inc. | Method for high-rate fiber laser manufacturing |
-
2021
- 2021-08-20 CN CN202110959213.7A patent/CN113783089A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202373839U (en) * | 2011-12-15 | 2012-08-08 | 华南理工大学 | Multistage cascading type 1064nm band high-power active seeker electronics (ASE) light source |
| CN104659639A (en) * | 2013-11-21 | 2015-05-27 | 上海瀚宇光纤通信技术有限公司 | High-power optical fiber amplifier with high heat dissipation rate |
| CN104852261A (en) * | 2015-06-05 | 2015-08-19 | 中国人民解放军国防科学技术大学 | High-power all-fiber MOPA structure superfluorescence fiber light source based on tandem pumping |
| US9905989B1 (en) * | 2016-07-25 | 2018-02-27 | Bae Systems Information And Electronic Systems Integration Inc. | Method for high-rate fiber laser manufacturing |
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Application publication date: 20211210 |