CN115064929A - Crystal fiber pump light coupling system and method thereof - Google Patents
Crystal fiber pump light coupling system and method thereof Download PDFInfo
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- CN115064929A CN115064929A CN202210935174.1A CN202210935174A CN115064929A CN 115064929 A CN115064929 A CN 115064929A CN 202210935174 A CN202210935174 A CN 202210935174A CN 115064929 A CN115064929 A CN 115064929A
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- 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
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094015—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre with pump light recycling, i.e. with reinjection of the unused pump light back into the fiber, e.g. by reflectors or circulators
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- 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
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- 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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- 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
- H01S3/094038—End pumping
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- 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
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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- 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
- H01S3/094049—Guiding of the pump light
- H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
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- 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
- H01S3/094084—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light with pump light recycling, i.e. with reinjection of the unused pump light, e.g. by reflectors or circulators
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- H—ELECTRICITY
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- 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
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
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Abstract
The invention discloses a pump light coupling system, which comprises a crystal fiber and a pump light emitting component, wherein the pump light emitting component is arranged on at least one side of the crystal fiber and is used for generating multiple paths of pump light with specific wavelength, and the pump light is injected into the crystal fiber from the side surface of the crystal fiber in multiple paths and is converted into signal light in the crystal fiber. The problem that the double-clad crystal fiber cannot be prepared at one time in the prior art, so that the effective pumping of the crystal fiber is limited is solved.
Description
Technical Field
The invention belongs to the technical field of fiber laser, and particularly relates to a pumping light coupling technology based on a crystal fiber.
Background
The crystal fiber is a novel gain medium between a bulk crystal used by a traditional solid laser and a glass fiber used by a fiber laser, and is prepared by preparing a crystal material into a fibrous single crystal with the diameter of between dozens of micrometers and 2 millimeters. The crystal fiber laser inherits the physicochemical properties and optical performance of a single crystal material and the morphological characteristics of an optical fiber material, and has the advantages of high thermal conductivity, high heat dissipation efficiency, small nonlinear gain coefficient and the like, so that a laser device taking the crystal fiber as a working medium can have high peak power of a solid laser and high average power of a fiber laser; meanwhile, the crystal fiber has the advantages of high rare earth ion doping concentration, good light transmission performance, high temperature resistance and the like, so that the crystal fiber has the potential of being applied to a fiber laser with higher power.
The glass fiber is provided with a silica cladding with a refractive index difference with a fiber core outside the fiber, and can realize total reflection so as to obtain high-efficiency optical waveguide. However, the crystal fiber is a novel one-dimensional functional crystal material, and a small-core crystal fiber having both a crystal core and a crystal cladding has not yet been successfully prepared, so how to efficiently and sufficiently couple pump light into a small-core crystal fiber without a cladding is a significant difficulty to be solved urgently in the application of the crystal fiber.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to: the system injects pump light into the crystal fiber uniformly from the side of the crystal fiber without a cladding structure in a multi-path way, and solves the problems that the injection of the pump light is difficult and the optical waveguide cannot be formed effectively because the crystal fiber with a small core diameter cannot draw the crystal cladding at one time at present.
The invention adopts the following technical scheme for solving the technical problems: a crystal fiber pump light coupling system comprises a crystal fiber and a pump light emitting assembly, wherein the pump light emitting assembly is arranged on at least one side of the crystal fiber and used for generating multiple paths of pump light with specific wavelength, and the multiple paths of pump light are uniformly injected into the crystal fiber from the side face of the crystal fiber and are converted into signal light in the crystal fiber.
In some embodiments, the crystal fiber pump light coupling system further comprises a first reflection component, the first reflection component is arranged at the other side of the crystal fiber, and the pump light which is not completely absorbed by the crystal fiber is emitted from the crystal fiber and is injected into the crystal fiber through the first reflection component from the direction meeting the effective gain length of the crystal fiber for the second time;
in some embodiments, the crystal fiber pump optical coupling system further includes a second reflection assembly disposed at two ends of the crystal fiber and located on the same optical axis as the crystal fiber, and the signal light is emitted from the two ends of the crystal fiber and is partially or completely reflected back to the crystal fiber by the second reflection assembly for sufficient amplification;
in some embodiments, the first reflective assembly comprises a plurality of shaping lenses, a plurality of total reflection lenses and at least one total reflection mirror; wherein,
the shaping lens and the total reflection lens are sequentially arranged on the same light path of the corresponding multi-path pump light;
the shaping lens is used for shaping the pumping light emitted from the crystal fiber so as to improve the spot brightness of the pumping light;
the total reflection lens is arranged on the same optical axis and used for reflecting the shaped pump light out along the same optical path to form a recovered pump light beam;
the total reflector is used for reflecting the recovered pump light beam again and injecting the recovered pump light beam into the crystal optical fiber from the end face or the side face of the crystal optical fiber for the second time, and the position of the total reflector is adjusted according to the angle of the pump light beam entering the crystal optical fiber optical axis and the effective gain length required by injecting the recovered pump light into the crystal optical fiber.
In some embodiments, the crystal fiber is a rare-earth ion doped unclad small core diameter crystal fiber.
The invention also provides a crystal fiber pump light coupling method for solving the technical problem, which comprises the following steps:
emitting multiple paths of pump light;
the multi-channel pump light is uniformly injected into the crystal fiber from the side surface of the crystal fiber along the direction vertical to the optical path of the crystal fiber;
the crystal fiber absorbs the pump light and converts the pump light into signal light.
In some embodiments, the step of absorbing the pump light and converting the pump light into the signal light by the crystal fiber further includes: and after the pump light which is not completely absorbed by the crystal fiber is emitted from the crystal fiber, the pump light is secondarily injected into the crystal fiber from the direction meeting the effective gain length of the crystal fiber through reflection.
In some embodiments, the signal light is split into two paths and emitted from two ends of the crystal fiber, and is partially or totally reflected back into the crystal fiber for sufficient amplification.
After the pump light which is not completely absorbed by the crystal fiber is emitted from the crystal fiber, shaping is carried out, and then the pump light is reflected out along the same optical path to form a recovered pump light beam;
and the recovered pump light beam is reflected again and injected into the crystal fiber from the end face or the side face of the crystal fiber for the second time, and the reflected angle is adjusted according to the angle of the pump light injected into the optical axis of the crystal fiber and the effective gain length required by injecting the recovered pump light into the crystal fiber.
In some embodiments, the crystal fiber is a rare earth ion doped unclad small core crystal fiber.
The invention has the beneficial effects that: multi-path pump light is uniformly injected from the side surface of the crystal fiber without the cladding, so that the difficulty that the double-cladding crystal fiber cannot be prepared at one time in the prior art and the pump light is injected is overcome; meanwhile, the adoption of a cascade pumping structure enables unabsorbed pumping light to pass through the crystal fiber twice, thereby effectively improving the absorptivity of the pumping light.
Drawings
FIG. 1 is a schematic diagram of a crystal fiber pump optical coupling system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a crystal fiber pump optical coupling system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of an optical path structure of a crystal fiber pump optical coupling system according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for coupling pump light of a crystal fiber according to another embodiment of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. It should be noted that when an element is referred to as being "fixed to"/"mounted to" another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 to 2, the present invention provides a crystal fiber pump optical coupling system, which includes a crystal fiber and at least one pump light emitting element.
The pump light emitting assembly is disposed at one side of the crystal fiber to provide multiple pump lights with specific wavelengths, and the multiple pump lights are uniformly injected into the crystal fiber from the side surface of the crystal fiber.
The design divides the pump light into multiple paths to be uniformly injected into the crystal fiber from the side surface of the crystal fiber, and solves the problems that the pump light is difficult to inject and an effective optical waveguide cannot be formed because the crystal cladding cannot be drawn at one time in the conventional small-core-diameter crystal fiber.
In another embodiment, a first reflection assembly is arranged at the other side of the crystal fiber and at a position corresponding to the pump light emission assembly, and the pump light which is not completely absorbed by the crystal fiber is emitted from the crystal fiber and is secondarily injected into the crystal fiber from a direction meeting the effective gain length of the crystal fiber through the first reflection assembly.
In the embodiment, the pump light coupling system adopts a cascade pumping mode, and the pump light which is not absorbed by the crystal fiber is recycled to pass through the crystal fiber for the second time, so that the pump light is efficiently and fully coupled into the crystal fiber, the absorption rate of the pump light is obviously improved, and the crystal fiber has practical application value in a high-power fiber laser.
Specifically, please refer to fig. 3 for a schematic diagram of an optical path structure in a preferred embodiment of the present invention, which includes: the device comprises a crystal fiber 1, at least one pump emission component 2 arranged on one side of the crystal fiber and a first reflection component 3 correspondingly arranged on the other side of the crystal fiber.
Preferably, the crystal fiber 1 adopts the cladding-free small-core-diameter crystal fiber doped with rare earth ions with a specific proportion as a gain medium, the diameter range of the core diameter of the fiber is 8 um-1000 um, the length range of the fiber is 10 mm-100 mm, and sufficient effective gain length can be provided.
The pump emission component 2 and the optical axis of the crystal fiber are in the same plane and arranged on at least one side of the crystal fiber for emitting pump light. Preferably, the pump emission assembly is composed of a plurality of pump chips arranged in a line, and the light emitting direction of the pump chips is set to be perpendicular to the crystal fiber, so that the emitted multi-channel pump light is uniformly injected into the crystal fiber from the side of the crystal fiber along the direction perpendicular to the optical axis of the fiber, thereby ensuring that the maximum efficiency gain of the pump light in the crystal fiber is converted into signal light.
Preferably, the wavelength range generated by the pumping chip covers 300 nm-1650 nm, and can be selected according to the absorption spectrum of the crystal optical fiber material.
In some embodiments, the pump emitting assembly may also employ a laser bar or COS module as a light source, depending on the structural design requirements of the laser.
In some embodiments, the number of the pump emission assemblies can be multiple, and the pump emission assemblies are arranged around the crystal fiber in multiple sides, so that the distribution of the injected pump light can be more uniform, and the absorption rate of the pump light in the crystal fiber can be improved.
In some embodiments, the light-emitting direction of the pump emission component may also be set to be a non-perpendicular angle with the optical axis of the crystal fiber according to the optical path design requirement of the laser, and the emitted multiple pump lights are uniformly injected into the crystal fiber from the side of the crystal fiber along an oblique direction.
In order to recover the pump light which is not fully absorbed by the crystal fiber, a first reflection assembly 3 is correspondingly arranged on the other side of the crystal fiber and at the position of the same optical axis plane with the pump emission assembly 2. In the embodiment of the present invention, the first reflecting assembly 3 is composed of a plurality of shaping lenses 31, a plurality of total reflecting lenses 32 and at least one recycling light total reflecting mirror 33, the number of which is consistent with that of the pumping chips.
The pumping chip, the shaping lens 31 and the total reflection lens 32 are sequentially arranged on the same optical path, and meanwhile, the total reflection lenses 32 are arranged in a row and are also arranged on the same optical axis, so that the shaped single-path pumping light is emitted along the same reflection optical path to form a recovered pumping light beam.
The recycling light total reflection mirror 33 is disposed on the same reflection light path, and is configured to recycle a recycling pump beam formed by the pump light that is not completely absorbed by the crystal fiber and inject the recycling pump beam into the crystal fiber again, thereby improving the light-to-light conversion efficiency of the pump light.
Preferably, the shaping lens 31 is a plano-concave cylindrical lens, and is configured to shape an elliptical spot of unabsorbed pump light emitted from the crystal fiber into a circle, so as to improve the spot brightness of the pump light, the plane and the concave surface of the plano-concave cylindrical lens are both plated with antireflection films with the emission wavelength of the pump chip, and the transmittance is greater than 95%.
Preferably, the total reflection lens 32 is a triangular mirror for reflecting the shaped pump light to the multi-surface total reflection mirror 33, a right-angle surface of the total reflection triangular mirror is plated with an antireflection film of the pump chip emission wavelength, the transmittance is greater than 95%, an oblique-angle surface is plated with a total reflection film of the pump chip emission wavelength, and the reflectance is greater than 98%.
Preferably, the recycling light total reflection mirror is a double-sided vertical reflection mirror, the vertical double faces of the double-sided vertical reflection mirror are respectively positioned on the same light path with the total reflection triangular mirror and the crystal fiber, the vertical double faces of the double-sided vertical reflection mirror are plated with total reflection films with pumping wavelengths, and the reflectivity is larger than 98%.
It can be understood that, when the plurality of total reflection triangular mirrors are arranged in a row and are positioned on the same optical axis parallel to the optical axis of the crystal fiber, the shaped single-path pump light is incident on the oblique angle surface of the triangular mirror, and after reflection, a beam of pump light parallel to the optical axis of the crystal fiber is formed and incident on one reflection surface of the double-sided vertical reflection mirror, and then is incident in parallel into the crystal fiber in the opposite direction through the other vertical reflection surface.
In some embodiments, two double-sided vertical mirrors may be respectively disposed at two ends of the crystal fiber, and the parallel pump beam emitted from the first double-sided vertical mirror is incident on the second double-sided vertical mirror, and then emitted in an anti-parallel manner, and injected into the crystal fiber along the optical axis of the fiber.
In some embodiments, a total reflection triangular mirror may be disposed on the same side of the crystal fiber as the pump chip, and the parallel pump beam emitted from the first double-sided vertical mirror is incident into the total reflection triangular mirror, and then emitted in a direction perpendicular to the optical axis of the crystal fiber and injected into the crystal fiber.
In some embodiments, since the multiple pump lights emitted by the pump emission component are uniformly injected into the crystal fiber from the side surface of the crystal fiber along an inclined angle which is not perpendicular to the optical axis of the fiber, the position and the angle of the recycled light total reflection mirror are adjusted according to the angle of the pump light injected into the optical axis of the crystal fiber and the effective gain length required by the recycled pump light injected into the crystal fiber.
As described above, the direction of the effective gain length of the crystal fiber may be from the end face direction of the crystal fiber, or may be from the side face of the crystal fiber in the same direction as the pump light emission direction. By setting different types or numbers of total reflectors and selecting the positions and angles of the total reflectors, the reflection of the recovered pump light beam to a specific direction can be realized, and the longer the effective gain length of the pump light passing through the optical fiber is, the higher the accumulated gain is, so that the requirement of injecting the pump light beam into the crystal optical fiber from the direction of the effective gain length of the crystal optical fiber is met, and the light-light conversion efficiency is improved.
In order to provide the amplification efficiency of the signal light in the crystal fiber, in the embodiment of the invention, the second reflection assemblies 4 are further arranged at the two ends of the crystal fiber, and the pump light injected into the crystal fiber is converted into the signal light, then divided into two paths to be respectively emitted out from the two ends of the crystal fiber, and then returned into the crystal fiber for full amplification through the reflection of the second reflection assemblies 4.
Specifically, the second reflecting assembly 4 includes a concave low reflecting mirror 41 and a concave total reflecting mirror 42, which are respectively disposed at two ends of the crystal fiber 1 and located on the same optical axis with the crystal fiber 1.
The concave low reflector 41 is used for partially reflecting the signal light back to the crystal fiber to fully amplify the signal light; the concave total reflection mirror 42 is used for totally reflecting the signal light back to the crystal fiber to further amplify the signal light.
Preferably, the concave low reflector 41 is a plano-concave lens, wherein the plane is plated with an antireflection film, and the central wavelength range transmitted by the antireflection film covers 245 nm-1700 nm and can be adjusted according to the central wavelength output by the laser; the concave surface of the concave low reflector is plated with a partial reflection film of the output wavelength of the laser, the reflectivity ranges from 40% to 99.9%, the curvature radius of the concave surface ranges from 0.5mm to 50mm, and the concave surface is selected according to the numerical aperture of the crystal optical fiber, so that the reflected signal light is completely emitted into the crystal optical fiber.
Preferably, the concave total reflection mirror 42 is a plano-concave lens, wherein the plane is plated with an antireflection film, the central wavelength range transmitted by the antireflection film covers 245 nm-1700 nm, and the central wavelength range is adjusted according to the emission wavelength of the pumping chip; the concave surface of the concave total reflector is plated with a total reflection film with the wavelength output by the laser, the reflectivity is greater than 98%, the curvature radius range of the concave surface is 0.5 mm-50 mm, and the concave surface is selected according to the numerical aperture of the crystal optical fiber.
In another embodiment of the present invention, the pump light coupling system is directly fixed on a metal heat sink 5 and packaged into a crystal fiber laser based on cascade pumping.
The metal heat sink 5 comprises a mounting surface and a heat dissipation structure adjacent to the mounting surface, the mounting surface is used for bearing the whole crystal fiber pump optical coupling system, and the heat dissipation structure is used for absorbing heat generated by the pump optical coupling system during operation and guiding the heat out through a heat dissipation medium.
The heat dissipation structure can be designed on one surface of the metal heat sink opposite to the installation surface, for example, a cooling pipeline is arranged to be wound on the opposite surface, and the heat dissipation structure can also be designed inside the metal heat sink and cooled by liquid heat dissipation media such as a refrigerant, and the specific design needs are selected according to the power of the laser.
Referring to fig. 4, an embodiment of the present invention provides a method for coupling pump light of a crystal fiber, including the steps of:
s101, emitting multi-path pump light;
s102, uniformly injecting the multiple paths of pump light into the crystal fiber from the side face of the crystal fiber;
s103, the crystal fiber absorbs the pump light and converts the pump light into signal light;
and S104, the pump light which is not completely absorbed by the crystal fiber is emitted from the crystal fiber and is injected into the crystal fiber for the second time from the direction meeting the effective gain length of the crystal fiber through reflection.
In step S103, the signal light is split into two paths and emitted from two ends of the crystal fiber, wherein one path of the signal light is partially reflected back to the crystal fiber to achieve sufficient amplification of the signal light, and the other path of the signal light is totally reflected back to the crystal fiber to achieve re-amplification of the signal light.
In step S104, the pump light that is not completely absorbed by the crystal fiber is emitted from the side surface of the crystal fiber, shaped, and reflected along the same optical path to form a recovered pump light beam, and the recovered pump light beam is re-reflected and secondarily injected into the crystal fiber from the end surface or the side surface of the crystal fiber, and the re-reflection angle is adjusted according to the angle of the pump light incident on the optical axis of the crystal fiber and the effective gain length that the recovered pump light needs to reach when being injected into the crystal fiber.
The crystal fiber pump optical coupling system, the coupling method and the crystal fiber laser based on the cascade pump adopt the non-cladding small-core-diameter crystal fiber, and inject the pump light from the side surface of the crystal fiber, thereby overcoming the defect that the double-cladding crystal fiber can not be prepared at one time in the prior art, thereby limiting the low pumping efficiency of the crystal fiber; meanwhile, the invention and creation with practical application value are adopted, and the pump light which is not absorbed passes through the crystal fiber for the second time, thereby greatly improving the absorption rate of the pump light.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A crystal fiber pump light coupling system is characterized by comprising a crystal fiber and at least one pump light emitting component, wherein the pump light emitting component is arranged on one side of the crystal fiber and used for generating multiple paths of pump light with specific wavelengths, and the multiple paths of pump light are uniformly injected into the crystal fiber from the side surface of the crystal fiber and are converted into signal light in the crystal fiber.
2. The crystal fiber pump light coupling system according to claim 1, further comprising a first reflection assembly disposed at the other side of the crystal fiber, wherein the pump light that is not completely absorbed by the crystal fiber is emitted from the crystal fiber, and is injected into the crystal fiber through the first reflection assembly from a direction that satisfies an effective gain length of the crystal fiber.
3. The crystal fiber pump optical coupling system according to claim 1, further comprising second reflection elements disposed at two ends of the crystal fiber and located on the same optical axis as the crystal fiber, wherein the signal light is emitted from the two ends of the crystal fiber, and is partially or completely reflected back to the crystal fiber by the second reflection elements for sufficient amplification.
4. The crystal fiber pump optical coupling system according to claim 2, wherein the first reflecting component comprises a plurality of shaping lenses, a plurality of total reflecting lenses and at least one total reflecting mirror; wherein,
the shaping lens and the total reflection lens are sequentially arranged and are positioned on the same light path with the corresponding pump light;
the shaping lens is used for shaping the pumping light emitted from the crystal fiber so as to improve the spot brightness of the pumping light;
the total reflection lens is used for reflecting the shaped pump light out along the same optical path to form a recovered pump light beam;
the total reflection mirror is positioned on the same light path of the total reflection lenses and is used for reflecting the recovered pump light beam again and injecting the recovered pump light beam into the crystal optical fiber from the end face or the side face of the crystal optical fiber for the second time, and the angle set by the total reflection mirror is adjusted according to the angle of the pump light beam entering the optical axis of the crystal optical fiber and the effective gain length required by the recovered pump light beam injected into the crystal optical fiber.
5. The crystal fiber pump light coupling system according to claim 1, wherein the crystal fiber is a rare earth ion doped unclad small core diameter crystal fiber.
6. A method for coupling crystal fiber pump light, comprising the steps of:
emitting multi-path pump light;
the multi-channel pump light is uniformly injected into the crystal fiber from the side surface of the crystal fiber;
the crystal fiber absorbs the pump light and converts the pump light into signal light.
7. The method of claim 6, wherein the step of absorbing the pump light and converting the pump light into signal light is further followed by: the pump light which is not completely absorbed by the crystal fiber is emitted from the crystal fiber and is injected into the crystal fiber for the second time from the direction which meets the effective gain length of the crystal fiber.
8. The method of claim 6, wherein the step of absorbing the pump light and converting the pump light into the signal light further comprises: and the signal light is divided into two paths to be emitted from two ends of the crystal optical fiber, and part or all of the signal light is reflected back to the crystal optical fiber for full amplification.
9. The method of claim 7, wherein the pump light that is not completely absorbed by the crystal fiber exits the crystal fiber, and the step of injecting the pump light into the crystal fiber a second time from a direction that satisfies an effective gain length of the crystal fiber further comprises: the pump light which is not completely absorbed by the crystal fiber is emitted from the crystal fiber, and is reflected out along the same optical path after being shaped to form a recovered pump light beam;
and the recovered pump beam is secondarily injected into the crystal fiber from the end face or the side face of the crystal fiber through secondary reflection, and the angle of the secondary reflection is adjusted according to the angle of the pump beam injected into the optical axis of the crystal fiber and the effective gain length required by injecting the recovered pump beam into the crystal fiber.
10. The method of claim 6, wherein the crystal fiber is a rare-earth ion-doped unclad small-core crystal fiber.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210935174.1A CN115064929A (en) | 2022-08-05 | 2022-08-05 | Crystal fiber pump light coupling system and method thereof |
| CN202211563392.3A CN116131080A (en) | 2022-08-05 | 2022-12-07 | Crystal fiber pump optical coupling system, method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210935174.1A CN115064929A (en) | 2022-08-05 | 2022-08-05 | Crystal fiber pump light coupling system and method thereof |
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| CN115064929A true CN115064929A (en) | 2022-09-16 |
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| CN202210935174.1A Withdrawn CN115064929A (en) | 2022-08-05 | 2022-08-05 | Crystal fiber pump light coupling system and method thereof |
| CN202211563392.3A Pending CN116131080A (en) | 2022-08-05 | 2022-12-07 | Crystal fiber pump optical coupling system, method and application thereof |
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| CN202211563392.3A Pending CN116131080A (en) | 2022-08-05 | 2022-12-07 | Crystal fiber pump optical coupling system, method and application thereof |
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| US4794615A (en) * | 1987-06-12 | 1988-12-27 | Spectra Diode Laboratories, Inc. | End and side pumped laser |
| CN1905293A (en) * | 2006-07-28 | 2007-01-31 | 中国科学院上海光学精密机械研究所 | Cladding Doped Slab Waveguide Laser Amplifier |
| US20110150012A1 (en) * | 2009-02-03 | 2011-06-23 | United States of America as represented by the Administrator of the National Aeronautics and | Passively q-switched side pumped monolithic ring laser |
| CN102437502A (en) * | 2011-11-28 | 2012-05-02 | 苏州生物医学工程技术研究所 | Thin disk 515nm all-solid-state green laser |
| CN102856785A (en) * | 2012-09-06 | 2013-01-02 | 中国电子科技集团公司第十一研究所 | End face and side face composite pumping device and laser |
| CN110289541A (en) * | 2019-05-14 | 2019-09-27 | 中国电子科技集团公司第十一研究所 | Slab laser |
| CN111769431A (en) * | 2020-07-01 | 2020-10-13 | 北京工业大学 | Structure for increasing one-way gain of angular side pumping and implementation method |
| CN113036587A (en) * | 2021-02-07 | 2021-06-25 | 中国科学院合肥物质科学研究院 | Amplified mid-infrared laser based on erbium-doped single crystal fiber seed light source |
-
2022
- 2022-08-05 CN CN202210935174.1A patent/CN115064929A/en not_active Withdrawn
- 2022-12-07 CN CN202211563392.3A patent/CN116131080A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4794615A (en) * | 1987-06-12 | 1988-12-27 | Spectra Diode Laboratories, Inc. | End and side pumped laser |
| CN1905293A (en) * | 2006-07-28 | 2007-01-31 | 中国科学院上海光学精密机械研究所 | Cladding Doped Slab Waveguide Laser Amplifier |
| US20110150012A1 (en) * | 2009-02-03 | 2011-06-23 | United States of America as represented by the Administrator of the National Aeronautics and | Passively q-switched side pumped monolithic ring laser |
| CN102437502A (en) * | 2011-11-28 | 2012-05-02 | 苏州生物医学工程技术研究所 | Thin disk 515nm all-solid-state green laser |
| CN102856785A (en) * | 2012-09-06 | 2013-01-02 | 中国电子科技集团公司第十一研究所 | End face and side face composite pumping device and laser |
| CN110289541A (en) * | 2019-05-14 | 2019-09-27 | 中国电子科技集团公司第十一研究所 | Slab laser |
| CN111769431A (en) * | 2020-07-01 | 2020-10-13 | 北京工业大学 | Structure for increasing one-way gain of angular side pumping and implementation method |
| CN113036587A (en) * | 2021-02-07 | 2021-06-25 | 中国科学院合肥物质科学研究院 | Amplified mid-infrared laser based on erbium-doped single crystal fiber seed light source |
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| CN116131080A (en) | 2023-05-16 |
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