CN115064930A - Crystal fiber laser based on cascade pumping - Google Patents
Crystal fiber laser based on cascade pumping Download PDFInfo
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- CN115064930A CN115064930A CN202210935186.4A CN202210935186A CN115064930A CN 115064930 A CN115064930 A CN 115064930A CN 202210935186 A CN202210935186 A CN 202210935186A CN 115064930 A CN115064930 A CN 115064930A
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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
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
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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
- H01S3/09—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
- H01S3/094019—Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove coupling
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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
- H01S3/09—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
- H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
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Abstract
The invention discloses a crystal fiber laser based on cascade pumping, which comprises: the multi-channel pumping light is injected into the crystal fiber from the direction perpendicular to the optical path of the crystal fiber, and the cylindrical shaping lens, the total reflection triangular mirror and the double-faced vertical reflector are used for recovering the pump light which is not completely absorbed by the crystal fiber and injecting the pump light into the crystal fiber again, so that the light-light conversion efficiency of the laser is improved, and the laser is a crystal fiber laser with practical application value.
Description
Technical Field
The invention belongs to the technical field of fiber laser, and particularly relates to a crystal fiber laser technology based on cascade pumping.
Background
The crystal fiber is a new gain medium between bulk crystal used in traditional solid laser and glass fiber used in fiber laser, and is prepared with crystal material into fiber monocrystal with diameter of several tens of microns to 2 mm. 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 doping concentration of rare earth ions, good light transmission, 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 having a refractive index difference with the core outside the fiber, and can realize total reflection to obtain a 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 crystal fiber laser based on the cascade pumping adopts a cascade pumping structure to enable pump light to pass through the crystal fiber twice, so that the absorption rate of the pump light is effectively improved. The problem that the pump light is difficult to inject into the crystal fiber and cannot form a high-efficiency optical waveguide is solved.
The invention adopts the following technical scheme for solving the technical problems:
the invention provides a crystal fiber laser based on cascade pumping, which comprises a crystal fiber, a plurality of pumping chips, a plurality of cylindrical shaping lenses, a plurality of total reflection triangular mirrors and a double-sided vertical reflecting mirror, wherein the crystal fiber is provided with a plurality of optical fibers;
the multiple pumping chips are arranged along one side of the crystal fiber and used for generating multiple paths of pumping light with specific wavelength, the multiple paths of pumping light are uniformly injected into the crystal fiber from the side surface of the crystal in the direction perpendicular to the optical axis of the fiber, and are absorbed and converted into signal light in the crystal fiber and then are emitted from the end surface of the crystal fiber;
the cylindrical shaping lens and the total reflection triangular mirror are sequentially arranged on the other side of the crystal optical fiber and are positioned in the same optical path with the pumping chip, pumping light which is not absorbed by the crystal optical fiber is emitted from the other side of the crystal optical fiber, and after shaping and reflection of the cylindrical shaping lens and the total reflection triangular mirror, the pumping light is secondarily injected into the crystal optical fiber from the end face of the crystal optical fiber in a direction parallel to the optical axis of the optical fiber through secondary reflection of the double-sided vertical reflecting mirror.
In one embodiment of the invention, the optical fiber further comprises a concave low reflector and a concave total reflector, the concave low reflector and the concave total reflector are respectively arranged at two ends of the crystal optical fiber, and the concave low reflector is used for partially reflecting signal light back to the crystal optical fiber so as to realize sufficient amplification of the signal light; the concave total reflection mirror is used for reflecting the signal light into the crystal fiber to realize the secondary amplification of the signal light.
In one embodiment of the invention, the crystal fiber is a rare earth ion doped cladding-free small-core-diameter crystal fiber, and the diameter range of the crystal fiber is 8-1000 um.
In one embodiment of the invention, the pump chip emits pump light with a wavelength of 969 nm.
In one embodiment of the invention, the cylindrical shaping lens is a plano-concave cylindrical lens, wherein both the plane and the concave surface of the plano-concave cylindrical lens are plated with a 969nm antireflection film.
In one embodiment of the invention, a 969nm antireflection film is plated on a right-angle surface of the total reflection triangular mirror, and a 969nm total reflection film is plated on an oblique-angle surface of the total reflection triangular mirror.
In one embodiment of the invention, the two vertical surfaces of the double-surface vertical reflecting mirror are plated with 969nm total reflection films.
In an embodiment of the present invention, the concave low reflection mirror is a plano-concave lens, wherein an antireflection film is plated on a plane of the plano-concave lens, a central wavelength transmitted by the antireflection film is 1030nm, a concave surface of the concave low reflection mirror is plated with a low reflection film having a central wavelength of 1030nm and a reflectivity of 90%, and a curvature radius of the concave surface is 12 mm.
In one embodiment of the invention, the concave total reflector is a plano-concave lens, wherein the plane of the plano-concave lens is plated with an antireflection film, and the central wavelength is 969 nm; the concave surface of the concave total reflecting mirror is plated with a total reflecting film with the central wavelength of 1030nm, the reflectivity is more than 99%, and the curvature radius of the concave surface is 12 mm.
In an embodiment of the invention, the optical fiber laser further comprises a heat sink, the concave low reflector, the concave total reflector, the pumping chip, the cylindrical surface shaping lens, the total reflection triangular mirror and the double-sided vertical reflector are directly fixed on the surface of the heat sink, and the concave low reflector, the concave total reflector, the pumping chip, the cylindrical surface shaping lens, the total reflection triangular mirror and the double-sided vertical reflector are all kept on the same optical axis plane.
The invention has the beneficial effects that: the cascade pumping structure is adopted to enable the pumping light to pass through the crystal fiber from the side surface of the fiber and the end surface of the fiber twice, so that the problems that the double-clad crystal fiber cannot be prepared in one step in the prior art, the pumping light is difficult to inject into the non-clad crystal fiber, and an effective optical waveguide cannot be formed are solved, and the absorption rate of the pumping light is effectively improved.
Drawings
Fig. 1 is a schematic diagram of pump light coupling in a crystal fiber laser according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of pump light coupling in a crystal fiber laser according to yet another embodiment of the present invention;
fig. 3 is a schematic diagram of an optical path structure of pump light coupling in a crystal fiber laser according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for coupling pump light in a crystal fiber laser according to another embodiment of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to"/"attached to"/"mounted to" another element, it can be directly on the other element or intervening elements may also be present. 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 laser based on cascaded pumping, which includes a crystal fiber and at least one pump light emitting module.
The pumping light emitting component is arranged at one side of the crystal fiber and is used for providing multiple paths of pumping light with specific wavelengths, and the multiple paths of pumping light are uniformly injected into the crystal fiber from the side surface of the crystal fiber, and due to the characteristics of the crystal fiber, the pumping light is converted into signal light in 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 one 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 crystal fiber laser adopts a cascade pumping mode, and the pump light which is not absorbed by the crystal fiber is recovered to pass through the crystal fiber for the second time, so that the pump light can be efficiently and fully coupled into the crystal fiber, thereby obviously improving the absorption rate of the pump light and ensuring that the crystal fiber has practical application value in a high-power fiber laser.
Specifically, please refer to the schematic diagram of the optical path structure of the preferred embodiment of the present invention provided in fig. 3, 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 arranged on the other side of the crystal fiber.
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. The pumping emission component is composed of a plurality of pumping chips arranged in a line, the light emitting direction of the pumping chips is set to be vertical to the crystal fiber, so that multiple paths of emitted pumping light are uniformly injected into the crystal fiber from the side surface of the crystal fiber along the direction vertical to the optical axis of the fiber, and the gain of the maximum efficiency of the pumping light in the crystal fiber is ensured to be converted into signal light.
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.
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, according to the optical path design requirement of the laser, the light outgoing direction of the pump emission component may also be set to be at a non-perpendicular angle with the optical axis of the crystal fiber, and the emitted multiple pump lights are uniformly injected into the crystal fiber from the side surface 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 reflection assembly 4 includes a concave low reflection mirror 41 and a concave total reflection 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; and the concave total reflection mirror 42 is used for totally reflecting the signal light back to the crystal fiber and further amplifying 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.
The device is directly fixed on a metal heat sink 5 and packaged into a crystal fiber laser.
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 concave low reflector, the concave total reflector, the pumping chip, the cylindrical shaping lens, the total reflection triangular mirror and the double-sided vertical reflector, and keeping the above components on the same optical axis plane, and the heat dissipation structure is used for absorbing heat generated when the crystal fiber laser based on the cascade pumping works 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 laser, 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.
According to the crystal fiber laser based on the cascade pumping and the coupling method thereof, the non-cladding small-core-diameter crystal fiber is adopted, and the pumping light is injected from the side surface of the crystal fiber, so that the defect that the double-cladding crystal fiber cannot be prepared at one time in the prior art, and the pumping efficiency of the crystal fiber is limited; 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 laser based on cascade pumping is characterized by comprising a crystal fiber, a plurality of pumping chips, a plurality of cylindrical shaping lenses, a plurality of total reflection triangular mirrors and a double-sided vertical reflector;
the multiple pumping chips are arranged along one side of the crystal fiber and used for generating multiple paths of pumping light with specific wavelength, the multiple paths of pumping light are uniformly injected into the crystal fiber from the side surface of the crystal fiber in the direction perpendicular to the optical axis of the fiber, and are emitted from two ends of the crystal fiber after being converted into signal light;
the cylindrical shaping lens and the total reflection triangular mirror are sequentially arranged on the other side of the crystal optical fiber and are positioned in the same optical path with the pumping chip, pumping light which is not absorbed by the crystal optical fiber is emitted from the other side of the crystal optical fiber, and after shaping and reflection of the cylindrical shaping lens and the total reflection triangular mirror, the pumping light is secondarily injected into the crystal optical fiber from the end face of the crystal optical fiber in a direction parallel to the optical axis of the optical fiber through secondary reflection of the double-sided vertical reflecting mirror.
2. The crystal fiber laser based on the cascade pump according to claim 1, further comprising a concave low reflector and a concave total reflector, the concave low reflector and the concave total reflector are respectively disposed at two ends of the crystal fiber, the concave low reflector is used for partially reflecting signal light back into the crystal fiber to achieve sufficient amplification of the signal light; the concave total reflection mirror is used for reflecting the signal light into the crystal fiber to realize the secondary amplification of the signal light.
3. The crystal fiber laser based on the cascade pumping according to claim 1, wherein the crystal fiber is a rare earth ion doped non-cladding small-core-diameter crystal fiber, and the diameter range of the crystal fiber is 8-1000 um.
4. The crystal fiber laser based on the cascade pump as claimed in claim 1, wherein the wavelength range of the pump light emitted by the pump chip is 300 nm-1650 nm.
5. The crystal fiber laser based on cascade pumping according to claim 1, wherein the cylindrical shaping lens is a plano-concave cylindrical lens for shaping an elliptical spot which does not absorb pumping light into a circular spot, the plane and the concave surface of the plano-concave cylindrical lens are both plated with an antireflection film which is consistent with the emission wavelength of the pumping chip, and the transmissivity is greater than 95%.
6. The cascade-pumping-based crystal fiber laser as claimed in claim 1, wherein the total reflection triangular mirrors are located on the same optical path and used for reflecting the unabsorbed pump light to the double-sided vertical reflecting mirrors along the same optical path, the right-angled surfaces of the total reflection triangular mirrors are plated with antireflection films of the pump chip emission wavelength, the transmittance is greater than 95%, the oblique-angled surfaces of the total reflection triangular mirrors are plated with total reflection films of the pump chip emission wavelength, and the reflectance is greater than 98%.
7. The cascade-pumping-based crystal fiber laser as claimed in claim 1, wherein the vertical double faces of the double-face vertical reflecting mirror are respectively located on the same optical path with the total reflection triangular mirror and the crystal fiber to recover the unabsorbed pump light, and are secondarily injected from the end face of the crystal fiber after being reflected again, the vertical double faces of the double-face vertical reflecting mirror are both plated with a total reflection film having a wavelength equal to that of the pump light, and the reflectivity is greater than 98%.
8. The cascade-pumping-based crystal fiber laser as claimed in claim 2, wherein the concave low reflection mirror is a plano-concave lens, wherein the plane of the plano-concave lens is plated with an antireflection film, the antireflection film transmits a central wavelength of 1030nm, the concave surface of the concave low reflection mirror is plated with a low reflection film with a central wavelength of 1030nm and a reflectivity of 90%, and the radius of curvature of the concave surface is 12 mm.
9. The cascade pumping-based crystal fiber laser as claimed in claim 2, wherein the concave total reflection mirror is a plano-concave lens, wherein the plane of the plano-concave lens is plated with an antireflection film, and the central wavelength is 969 nm; the concave surface of the concave total reflecting mirror is plated with a total reflecting film with the central wavelength of 1030nm, the reflectivity is more than 99%, and the curvature radius of the concave surface is 12 mm.
10. The cascade pumping-based crystal fiber laser of claim 2, further comprising a heat sink, wherein the concave low reflector, the concave total reflector, the pumping chip, the cylindrical shaping lens, the total reflection triangular mirror and the double-sided vertical reflector are directly fixed on the surface of the heat sink, and the concave low reflector, the concave total reflector, the pumping chip, the cylindrical shaping lens, the total reflection triangular mirror and the double-sided vertical reflector are all maintained on the same optical axis plane.
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