CN112152057A - Quick response fiber laser - Google Patents
Quick response fiber laser Download PDFInfo
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- CN112152057A CN112152057A CN202011088110.XA CN202011088110A CN112152057A CN 112152057 A CN112152057 A CN 112152057A CN 202011088110 A CN202011088110 A CN 202011088110A CN 112152057 A CN112152057 A CN 112152057A
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- 239000000835 fiber Substances 0.000 title claims abstract description 121
- 230000004044 response Effects 0.000 title claims abstract description 48
- 238000005086 pumping Methods 0.000 claims abstract description 38
- 238000005253 cladding Methods 0.000 claims abstract description 25
- 239000011162 core material Substances 0.000 claims description 24
- 230000003287 optical effect Effects 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 8
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 7
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 7
- 238000002310 reflectometry Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
-
- 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
- H01S3/06729—Peculiar transverse fibre profile
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention provides a quick response fiber laser, which belongs to the technical field of lasers and comprises a pumping source and a gain fiber, wherein the pumping source is arranged along the direction of the gain fiber, pumping light output by the pumping source is injected into the gain fiber, and the core cladding ratio of the gain fiber is between 5% and 10%. By adopting the gain optical fiber with high core cladding ratio, the response time of the resonant cavity of the optical fiber laser can be improved, so that the faster laser response speed can be obtained, the response time of the laser can be shortened, and the response time of different power sections can be ensured to be consistent.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a quick response fiber laser.
Background
The existing laser design scheme mainly aims at the conventional application field, and the total response time of the existing laser design scheme is generally about 50 us-100 us. The response time t1 of the driver is 1-10 us, the response time t2 of the pump laser is 0.2-2 us, the response time t3 of the resonant cavity of the fiber laser is 2-90 us, the response time is different according to different output laser powers, and in some special application fields, such as the fields of ultra-fast laser material processing, advanced manufacturing and the like, laser cutting, welding, 3D printing and the like, the response time of the laser is generally within 10us, and the response times of different power sections are consistent as much as possible. Current laser designs often have difficulty achieving fast laser response in the full power section.
Disclosure of Invention
The invention aims to provide a quick response fiber laser which can obtain higher laser response speed and has consistent response time of different power sections.
The embodiment of the invention is realized by the following steps:
the embodiment of the invention provides a quick response fiber laser, which comprises a pumping source and a gain fiber, wherein the pumping source is arranged along the direction of the gain fiber, pumping light output by the pumping source is injected into the gain fiber, and the core cladding ratio of the gain fiber is between 5% and 10%.
Optionally, the core diameter of the gain fiber is between 4um and 20um, and the cladding diameter of the gain fiber is between 120um and 400 um.
Optionally, a core material of the gain fiber is doped with ytterbium, and a doping concentration of the ytterbium is 4 × 1025/m3～30×1025/m3。
Optionally, the pump source is a semiconductor laser, the central wavelength of the semiconductor laser is 974.5nm to 977.5nm, and the bandwidth of the semiconductor laser is 1nm to 3 nm.
Optionally, the numerical aperture of the gain fiber is between 0.05 and 0.18.
Optionally, the optical fiber further includes a beam combiner disposed between the pump source and the gain fiber, and the pump light output by the pump source is coupled by the beam combiner and injected into the gain fiber.
Optionally, the pump source injects the optical signal into the gain fiber along a transmission direction of the optical signal, a first high-reflection grating is disposed between the beam combiner and the gain fiber, and a low-reflection grating is disposed at one end of the gain fiber, which is far away from the pump source.
Optionally, the pump source injects the gain fiber in a direction opposite to a transmission direction of the optical signal, a second high-reflection grating is disposed at one end of the gain fiber, which is far away from the beam combiner, and a third high-reflection grating is disposed at one end of the pump source, which is far away from the beam combiner.
Optionally, a mold stripper is disposed at an end of the third high-reflection grating away from the pumping source.
Optionally, a first pump source and a first beam combiner are disposed at an end of the second high reflective grating far away from the gain fiber, and the first beam combiner is close to the second high reflective grating.
The embodiment of the invention has the beneficial effects that:
the fast response fiber laser provided by the embodiment of the invention comprises a pumping source and a gain fiber, wherein the pumping source is arranged along the direction of the gain fiber, pumping light output by the pumping source is injected into the gain fiber, the core cladding ratio of the gain fiber is between 5% and 10%, and the response time of a resonant cavity of the fiber laser can be prolonged by adopting the gain fiber with a high core cladding ratio, so that the faster laser response speed is obtained, the response time of the laser is shortened, and the response time consistency of different power sections is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a fast response fiber laser provided in an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a fast response fiber laser according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a fast response fiber laser according to an embodiment of the present invention.
Icon: 10-a red light source; 11-a pump source; 12-a combiner; 13-a first high-reflection grating; 14-gain fiber; 15-low reflection grating; 16-a mould stripper; 17-an end cap; 18-a second high-reflection grating; 19-a third high-reflectivity grating; 20-a first pump source; 21-first beam combiner.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provides a fast response fiber laser, which comprises a pump source 11 and a gain fiber 14, wherein the pump source 11 is arranged along the direction of the gain fiber 14, pump light output by the pump source 11 is injected into the gain fiber 14, and the core cladding ratio of the gain fiber 14 is between 5% and 10%.
The pump source 11 outputs pump light, which is injected into the gain fiber 14. The pumping source 11 can adopt a semiconductor laser, the central wavelength of the semiconductor laser is 974.5nm to 977.5nm, and the bandwidth of the semiconductor laser is 1nm to 3 nm; when the pumping source 11 is a semiconductor laser, 135/155 (a 135um diameter fiber core and a 155um diameter cladding) output fiber is selected as an active fiber in the pumping fiber, and the NA (numerical aperture) is 0.05-0.18.
The core cladding ratio of the gain fiber 14 is between 5% and 10%, the core cladding ratio refers to the ratio of the core diameter to the cladding diameter of the gain fiber 14, and the gain fiber 14 with the high core cladding ratio can improve the corresponding time of a resonant cavity of the fiber laser, so that the laser response speed is higher, and the laser response time is shortened. By adopting the gain fiber 14 with the core-cladding ratio, the response time of the laser can be shortened to be within 10 us. And, the gain fiber 14 with high core-cladding ratio can ensure that the response time of different power sections is consistent.
According to the fast response fiber laser provided by the embodiment of the invention, the core cladding ratio of the gain fiber 14 is set to be between 5% and 10%, and the gain fiber 14 with the high core cladding ratio is adopted, so that the corresponding time of the resonant cavity of the fiber laser can be prolonged, the faster laser response speed can be obtained, the response time of the laser can be shortened, and the response time of different power sections can be ensured to be consistent.
Specifically, the core diameter of the gain fiber 14 is between 4um and 20um, and the cladding diameter of the gain fiber 14 is between 120um and 400 um.
The core material of the gain fiber 14 is doped with ytterbium element, and the doping concentration of the ytterbium element is 4 × 1025/m3～30×1025/m3Is 1m3Is doped with 4 x 1025～30×1025Ytterbium particles.
The purpose of ytterbium doping is to facilitate the transition from passive transmission fiber to active fiber with amplification.
Three examples are described below:
example one
Referring to fig. 1, a beam combiner 12 is further disposed between the pump source 11 and the gain fiber 14, and the pump light output by the pump source 11 is coupled to the gain fiber 14 via the beam combiner 12.
The beam combiner 12 mainly combines the multiple pump beams into one gain fiber for output, and is mainly used for increasing the pump power.
In this embodiment, the pump light is forward pumped, that is, the pump light and the optical signal are injected into the gain fiber 14 in the same direction, the red light source 10 emits red light, the red light signal is transmitted to the right, the pump light output by the pump source 11 is injected into the gain fiber 14 through the beam combiner 12 along the transmission direction of the optical signal and is injected into the gain fiber 14, and the pump light is also transmitted to the right.
A first high reflecting grating 13 is arranged between the beam combiner 12 and the gain fiber 14, and a low reflecting grating 15 is arranged at one end of the gain fiber 14 far away from the pumping source 11. The end of the low reflective grating 15 far away from the gain fiber 14 is provided with a stripper 16, and the residual pump light or cladding light is stripped by the stripper 16 and then output.
In this embodiment, the gain fiber 14 with a fiber core diameter of 14um and a cladding diameter of 250um can be used; alternatively, a gain fiber 14 having a core diameter of 20um and a cladding diameter of 250um is used.
The core cladding ratio of the gain fiber 14 is larger, the larger the fiber core diameter is, the larger the absorption section is, and the stronger the pump light absorption is; the smaller the diameter of the cladding, the larger the power density of the pump light, and the stronger the pump light absorption; in sum, the larger the core-cladding ratio of the optical fiber is, the higher the absorption efficiency is and the faster the response speed is. For example, the core package ratio 14/250 is about twice as efficient as the core package ratio 20/400.
Example two
Referring to fig. 2, the present embodiment is reverse pumping, that is, pumping light and optical signals are injected into two ends of the gain fiber 14 in different directions, the pumping light output by the pumping source is injected into the gain fiber 14 in a direction opposite to the transmission direction of the optical signals, the red light signal emitted by the red light source 10 is transmitted to the right, the pumping light output by the pumping source 11 is injected into the gain fiber 14 in the reverse direction of the transmission direction of the optical signals by the beam combiner 12, and the pumping light is transmitted to the left.
A second high-reflection grating 18 is arranged at one end of the gain fiber 14 far away from the beam combiner 12, and a third high-reflection grating 19 is arranged at one end of the pump source 11 far away from the beam combiner 12. The end of the third high-reflection grating 19 far away from the pumping source 11 is provided with a stripper 16.
The beam combiner 12 is located between the gain fiber 14 and the third high-reflectivity grating 19, at this time, the beam combiner 12 is a reverse beam combiner, a red light signal emitted by the red light source 10 is injected into the gain fiber 14 from the left end, and the pumping light output by the pumping source 11 is injected into the gain fiber 14 from the right end of the gain fiber 14 through the beam combiner 12. Other parameters are the same as for forward pumping.
EXAMPLE III
Referring to fig. 3, on the basis of the second embodiment, the present embodiment adopts a bidirectional pump.
The end of the second high-reflection grating 18 far away from the gain fiber 14 is provided with a first pump source 20 and a first beam combiner 21, and the first beam combiner 21 is close to the second high-reflection grating 18.
In this embodiment, there are two pump sources and two beam combiners, i.e., pump source 11 and first pump source 20, and beam combiner 12 and first beam combiner 21. The pump source 11 and the combiner 12 are located at the same end of the gain fiber 14, and the first pump source 20 and the first combiner 21 are located at the other end of the gain fiber 14.
The pump light output by the first pump source 20 is injected into one end of the gain fiber 14 through the first beam combiner 21 and the second high-reflection grating 18 in the same direction as the optical signal, and the pump light output by the pump source 11 is injected into the other end of the gain fiber 14 through the beam combiner 12 in the opposite direction to the optical signal. The pump light of the first pump source 20 is injected into the gain fiber 14 in the same direction as the optical signal, and the pump light of the pump source 11 is injected into the gain fiber 14 from the opposite direction. The bidirectional pumping combines the advantages of forward pumping and reverse pumping, so that the pumping light is uniformly distributed in the gain fiber, the pumping power at two ends of the gain fiber 14 can be balanced, the distribution of the number of reversed particles is more uniform, and the heat dissipation pressure is smaller. Other parameters are the same as for forward pumping.
In addition, in the above three embodiments, an end cap 17 or a fiber laser cable (QBH) is further provided at the output end of the stripper 16, which is used as an optical output interface for high-power fiber laser transmission.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The fast response fiber laser is characterized by comprising a pumping source and a gain fiber, wherein the pumping source is arranged along the direction of the gain fiber, pumping light output by the pumping source is injected into the gain fiber, and the core cladding ratio of the gain fiber is between 5% and 10%.
2. The fast response fiber laser of claim 1, wherein the gain fiber has a core diameter between 4um and 20um and a cladding diameter between 120um and 400 um.
3. The fast response fiber laser of claim 1, wherein the core material of the gain fiber is doped with ytterbium in a concentration of 4 x 1025/m3～30×1025/m3。
4. The fast response fiber laser of claim 1, wherein the pump source is a semiconductor laser having a center wavelength between 974.5nm and 977.5nm and a bandwidth between 1nm and 3 nm.
5. The fast response fiber laser of claim 1, wherein the gain fiber has a numerical aperture between 0.05 and 0.18.
6. The fast response fiber laser of any one of claims 1 to 5, further comprising a beam combiner disposed between the pump source and the gain fiber, wherein the pump light output by the pump source is coupled and injected into the gain fiber through the beam combiner.
7. The fast response fiber laser of claim 6, wherein the pump light output from the pump source is injected into the gain fiber along a transmission direction of the optical signal, a first high-reflectivity grating is disposed between the beam combiner and the gain fiber, and a low-reflectivity grating is disposed at an end of the gain fiber away from the pump source.
8. The fast response fiber laser of claim 6, wherein the pump light output from the pump source is injected into the gain fiber in a direction opposite to a transmission direction of the optical signal, an end of the gain fiber away from the combiner is provided with a second high-reflectivity grating, and an end of the pump source away from the combiner is provided with a third high-reflectivity grating.
9. The fast response fiber laser of claim 8, wherein a mode stripper is disposed at an end of the third high-reflection grating remote from the pump source.
10. The fast response fiber laser of claim 9, wherein an end of the second highly reflective grating remote from the gain fiber is provided with a first pump source and a first combiner, and the first combiner is located close to the second highly reflective grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011088110.XA CN112152057A (en) | 2020-10-13 | 2020-10-13 | Quick response fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011088110.XA CN112152057A (en) | 2020-10-13 | 2020-10-13 | Quick response fiber laser |
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| CN112152057A true CN112152057A (en) | 2020-12-29 |
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| CN202011088110.XA Pending CN112152057A (en) | 2020-10-13 | 2020-10-13 | Quick response fiber laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504032A (en) * | 2021-09-06 | 2021-10-15 | 深圳市创鑫激光股份有限公司 | Fiber grating test system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5923684A (en) * | 1996-09-26 | 1999-07-13 | Lucent Technologies Inc. | Fiber amplifier with multiple pass pumping |
| CN106099630A (en) * | 2016-08-10 | 2016-11-09 | 中国工程物理研究院激光聚变研究中心 | A kind of optical fiber laser and laser generation method |
| US20190140414A1 (en) * | 2017-08-07 | 2019-05-09 | Shaheed Rahim | Anti-reflection coated pump dumps |
| CN214100214U (en) * | 2020-10-13 | 2021-08-31 | 炬光(东莞)微光学有限公司 | Quick response fiber laser |
-
2020
- 2020-10-13 CN CN202011088110.XA patent/CN112152057A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5923684A (en) * | 1996-09-26 | 1999-07-13 | Lucent Technologies Inc. | Fiber amplifier with multiple pass pumping |
| CN106099630A (en) * | 2016-08-10 | 2016-11-09 | 中国工程物理研究院激光聚变研究中心 | A kind of optical fiber laser and laser generation method |
| US20190140414A1 (en) * | 2017-08-07 | 2019-05-09 | Shaheed Rahim | Anti-reflection coated pump dumps |
| CN214100214U (en) * | 2020-10-13 | 2021-08-31 | 炬光(东莞)微光学有限公司 | Quick response fiber laser |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504032A (en) * | 2021-09-06 | 2021-10-15 | 深圳市创鑫激光股份有限公司 | Fiber grating test system and method |
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