CN211295688U - Narrow linewidth fiber laser based on side pumping technology - Google Patents
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- CN211295688U CN211295688U CN202020111132.2U CN202020111132U CN211295688U CN 211295688 U CN211295688 U CN 211295688U CN 202020111132 U CN202020111132 U CN 202020111132U CN 211295688 U CN211295688 U CN 211295688U
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Abstract
The utility model relates to a photoelectron technical field particularly, relates to a narrow linewidth fiber laser based on side pumping technique. The application comprises a seed source generating unit and an amplifying unit: the seed source generating unit is a resonant cavity used for generating corresponding seed light according to parameters of the adopted high-reflection grating and low-reflection output grating when the LD pumping source is injected; the amplification unit is a side pumping optical fiber for amplifying the seed light when injecting the LD pumping source; the resonant cavity comprises a high-reflection grating, an active optical fiber and a low-reflection output optical fiber; the high-reflection grating, the active optical fiber and the low-reflection output optical fiber are sequentially connected. The application adopts a full reverse pumping mode to better inhibit the nonlinear effect threshold value and improve the maximum output power.
Description
Technical Field
The utility model relates to a photoelectron technical field particularly, relates to a narrow linewidth fiber laser based on side pumping technique.
Background
The all-fiber laser has the advantages of compact structure, good heat dissipation performance, high conversion efficiency, excellent beam quality, stable performance and the like, and gradually replaces a solid laser, a chemical laser and a gas laser to become mainstream products in the current laser market. The kilowatt-level fiber laser with the all-fiber structure mostly adopts the following three laser resonant cavity structures, namely 1) a plurality of single fiber Fabry-Perot cavity structures are unidirectionally pumped by the same pump sources through a forward pumping beam combiner; 2) two pumping beam combiners are adopted, wherein the reverse pumping/signal beam combiner is of a side pumping structure and adopts a plurality of same pump sources to pump a single fiber Fabry-Perot cavity structure in a two-way manner; 3) a Master Oscillator Power Amplifier (MOPA) architecture with a seed source plus amplifier is employed. The cavity structure of the first unidirectional pumping fiber laser has the defects that the pumping power is too high, the stimulated spontaneous radiation is serious, the temperature is too high, the nonlinear effect of the fiber is easily caused, the Kerr effect and the stimulated Raman scattering are generated, even multimode oscillation occurs, and the stability of the laser is influenced. The second two-way pump optical fiber laser cavity structure has the advantages that the power distribution and the temperature uniformity of pump light on active optical fibers in the cavity are obviously improved compared with those of the first two-way pump optical fiber laser cavity structure, but due to the limited absorption of the fiber core of the active optical fiber to forward and backward transmission pump light, part of residual pump light exists in the forward transmission pump light and the backward transmission pump light in the inner cladding, and the residual pump light is transmitted to the pump optical fiber through the forward pump signal beam combiner and the backward pump signal beam combiner and enters the pump source, so that interference and damage are caused to a pump source chip, the service life of the pump source is influenced, and the stability of the optical fiber laser is influenced. The fiber laser with the third MOPA structure is divided into two stages, the circuit control and the optical path structure of the fiber laser are both more complicated than those of the former two stages, and the cost, the beam quality and the working stability of the fiber laser are inferior to those of the fiber laser with a single-cavity structure in a pulse working state.
The invention patent CN 103986046A-a narrow linewidth fiber laser discloses that the invention 1) realizes laser amplification in a forward pumping mode, but the nonlinear effect threshold cannot be well inhibited. 2) The beam combiner end pumping mode is adopted instead of side pumping, the injection capability is not enough, and the beam quality is cracked due to welding spots in the end pumping beam combiner.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a narrow linewidth fiber laser based on a side pumping technique to solve the technical problem existing in the prior art. The adoption of a full-reverse pumping mode can better inhibit the nonlinear effect threshold value and improve the maximum output power.
The utility model discloses a following technical scheme:
a narrow linewidth fiber laser based on a side pumping technology comprises a seed source generation unit and an amplification unit: the seed source generating unit is a resonant cavity used for generating corresponding seed light according to parameters of the adopted high-reflection grating and low-reflection output grating when the LD pumping source is injected; the amplification unit is a side pumping optical fiber for amplifying the seed light when injecting the LD pumping source; the resonant cavity comprises a high-reflection grating, an active optical fiber and a low-reflection output optical fiber; the high-reflection grating, the active optical fiber and the low-reflection output optical fiber are sequentially connected.
Preferably, the seed source generating unit further comprises an optical isolator disposed between the resonant cavity and the side pump fiber.
Preferably, the seed source generation unit further comprises a mode field adapter disposed between the optical isolator and the side pump fiber.
Preferably, the seed source generation unit further comprises a first cladding light stripper, the first cladding light stripper being disposed between the resonant cavity and the optical isolator; the amplifying unit further comprises a second cladding light stripper, and the second cladding light strippers are arranged at two ends of the side pumping optical fiber.
Preferably, the LD pump source injects the pump fiber input end and the pump fiber output end of the side pump fiber, and amplifies the seed light output by the pre-amplification unit through the active fiber of the side pump fiber; when the LD pumping source is connected with the input end of the pumping fiber in the side pumping fiber, the forward injection of the multi-path pumping source is achieved; when the LD pumping source is connected with the output end of the pumping fiber in the side pumping fiber, the reverse injection of the multi-path pumping source is achieved; when the LD pumping source is simultaneously connected with the input end of the pumping fiber in the side pumping fiber and the output end of the pumping fiber in the side pumping fiber, the LD pumping source is used for realizing the bidirectional injection of the side pumping fiber.
Preferably, the fiber core diameter of the high-reflection grating fiber pigtail and the fiber core diameter of the low-reflection output grating fiber pigtail are within the range of 5-30 μm; the parameter ranges of the cladding diameter of the high-reflection grating fiber pigtail and the cladding diameter of the low-reflection output grating fiber pigtail are 125-400 mu m.
Preferably, the active optical fiber core ranges from 5 to 30 μm; the maximum diameter of the active fiber cladding is 125-400 μm.
Preferably, the seed spectrum range is 1050-1090nm, and the 3dB bandwidth is 0.05-0.2 nm.
Preferably, the narrow linewidth fiber laser further includes a laser output head, and the laser output head is configured to output the amplified seed light.
Preferably, the LD pump source is injected into the resonant cavity through a beam combiner, and the beam combiner is configured to combine signals of the multiple pump sources to form the LD pump source.
Since the technical scheme is used, the utility model discloses following beneficial effect has:
(1) the narrow linewidth fiber laser built based on the side pumping technology has stronger pumping injection capacity.
(2) The narrow linewidth fiber laser built based on the side pumping technology is particularly suitable for bidirectional pumping and full-reverse pumping, and can well inhibit spectrum broadening and nonlinear effect.
(3) The narrow linewidth fiber laser built based on the side pumping technology is even in heat distribution, and is safer and more reliable.
(4) The side-pumping-based optical beam combiner is based on a side pumping technology, and beam quality cracking caused by welding spots in the end-pumping beam combiner does not exist.
Drawings
In order to more clearly illustrate the technical solution of the mode of the invention, the drawings that are required to be used in the embodiment are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the invention, and are not to be considered as limiting the scope, and that for a person skilled in the art, other relevant drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic block diagram of a narrow linewidth fiber laser based on a side pumping technique according to an embodiment of the present disclosure;
fig. 2 is a detailed schematic structural diagram of a block diagram of a narrow-linewidth fiber laser based on a side pumping technique according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a side-pumped optical fiber according to an embodiment of the present disclosure;
fig. 4 is a schematic cross-sectional view of a side-pumped optical fiber according to an embodiment of the present invention;
fig. 5(a), (b) are schematic cross-sectional views of side-pumped fibers according to another embodiment of the present invention;
fig. 6(a) and (b) are schematic cross-sectional views of a side pump fiber according to still another embodiment of the present invention.
1-seed source generating unit 2-amplifying unit 3-laser output head
4-indicating light 5-pumping source 6-beam combiner
7-high reflection grating 8-active optical fiber 9-low reflection output grating
10-cladding light stripper 11-isolator 12-mode field adapter
13-side pumping optical fiber 14-primary coating layer 15-secondary coating layer
Active fiber input end in 131-side pumping fiber
Active fiber output end in 132-side pump fiber
133-pump fiber input end in side-pump fiber
134-pump fiber output in side pump fiber.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The application provides a narrow linewidth fiber laser based on a side pumping technology, which is applied to various application scenes needing to be applied, for example; scientific research and military use.
The narrow linewidth fiber laser based on the side pumping technology comprises a seed source generation unit and an amplification unit: the seed source generating unit is a resonant cavity used for generating corresponding seed light according to parameters of the adopted high-reflection grating and low-reflection output grating when the LD pumping source is injected; the amplification unit is a side pumping optical fiber for amplifying the seed light when injecting the LD pumping source; the resonant cavity comprises a high-reflection grating, an active optical fiber and a low-reflection output optical fiber; the high-reflection grating, the active optical fiber and the low-reflection output optical fiber are sequentially connected.
Wherein, 1) seed light generation process:
step 101: the LD pumping source is injected into the beam combiner and is processed by the resonant cavity to generate seed light;
step 102: the seed light is isolated by the optical isolator, so that the laser signal is prevented from being reversely input into the resonant cavity to influence the work of the resonant cavity.
2) The amplifying unit amplifies:
when the seed light passes through the amplifying unit, forward injection, reverse injection and bidirectional injection of the LD pumping light source can be realized according to the condition that the LD pumping source is injected into the resonant cavity;
3) the high-reflection protection grating and the low-reflection output grating are fiber gratings with certain reflectivity for specific wavelength, can reflect the returned laser back, and are mainly used for protecting a laser; the reflectivity of the optical signal of the low-reflection output grating is 5% -30%; the reflectivity of the optical signal of the high-reflection grating is more than 99%.
The working process is as follows: the indicating light is directly injected into the laser light path through the beam combiner, penetrates through the whole light path and passes through the laser output head, and is mainly used for assisting human eyes in observing the output light path of the laser; the pump light is first injected into the resonant cavity to generate laser oscillation. The generated oscillation laser passes through the low-reflection output optical fiber and outputs partial laser. The output laser is output as seed light after passing through a cladding stripper, an isolator and a mode field adapter in sequence. The seed light is input through the active optical fiber input end of the side pumping optical fiber, and the seed light amplification is completed in the side pumping optical fiber with the amplification function under the pumping of the pumping light.
In order to detail the narrow linewidth fiber laser disclosed in the above embodiments, the active fiber of the side-pumped fiber is a rare-earth-doped gain fiber. For example, the fiber core is quartz glass doped with rare earth elements, and the rare earth elements are at least one of ytterbium, erbium, thulium, holmium, praseodymium and rubidium. The active fibers of the side-pumped active fiber are all gain fibers doped with rare earth elements.
Wherein, the side pumping optical fiber concrete structure: as shown in FIG. 3, the side-pumped optical fiber has a middle fusion-spliced bundle region B, and a split region A and a split region C (which are double-clad or multi-clad structures, the outer diameter of the middle fusion-spliced bundle region B is 250 μm to 1000 μm, and the core diameter is 15 μm to 300 μm) at both ends of the middle fusion-spliced bundle region B. The side pumping fiber comprises at least one active fiber and at least one pumping fiber, wherein the pumping fiber is wound around the active fiber in an axial torsion mode and is subjected to side fusion to form a side pumping fiber core (the core of the active fiber) and a side pumping fiber (the cladding of the active fiber except the core and the dissolved part, the primary coating layer and the secondary coating layer of the pumping fiber). The active optical fiber comprises an active fiber core and an active cladding, and the refractive index of the fiber core is smaller than that of the cladding; the pump optical fiber is a coreless optical fiber, and the refractive index of the pump optical fiber is less than or equal to that of the active optical fiber cladding.
Furthermore, the pump optical fiber is wound around the active optical fiber in the axial direction and is welded into a whole, and a primary coating layer and a secondary coating layer are arranged in the middle fusion beam combining area of the pump optical fiber. The primary coating layer can be selected from low refractive index coating to be coated along the circumferential wrapping of the fusion bonding beam zone of the composite function optical fiber, the secondary coating layer can be selected from organic coating to be coated along the circumferential wrapping of the outer layer of the primary coating layer, the fiber core is quartz glass doped with rare earth elements, and the rare earth elements are at least one of ytterbium, erbium, thulium, holmium, praseodymium and rubidium.
Further, the cross-sectional shapes of the active fibers (e.g., the active fiber input end 131 and the active fiber output end 132 in fig. 2, 3, 4 and 5, the active fiber input end 131 and the active fiber output end 132 are both active fiber ends) and the pump fibers (e.g., the pump fiber input end 133 and the pump fiber output end 134 in fig. 2, 3, 4 and 5, the pump fiber input end 133 and the pump fiber output end 134 are both pump fiber ends) are circular or polygonal structures. For example, the fiber bundle can be D-shaped, circular, regular hexagon, regular octagon, regular dodecagon or quincunx and the like, can be suitable for flat or uneven cladding surface structures of various active fibers and pumping fibers, can achieve a better fusion bundle effect of the pumping fibers and the active fibers by axially twisting and winding the pumping fibers around the active fibers and performing side fusion to form a whole, and reduces the requirements on the surface treatment of the cladding of the active fibers and the pumping fibers, wherein the pumping fibers are coreless fibers, and the refractive indexes of the cladding of the pumping fibers are not different.
Advantage 1, in this patent side pump optical fiber realized traditional optical fiber beam combiner and active optical fiber's both function, eliminate the air bed in the fusion beam combining district more easily, realize that laser from pump optical fiber to active optical fiber high-efficient coupling, make it form as an organic whole to can effectively guarantee coupling structure's stability.
Advantage 2, among this patent each optic fibre of side pump optical fiber fusion splice beam zone evenly melt, the pump light of pump optical fiber evenly pours into the heat into along active optical fiber side direction to the heat distribution that the pump light that makes the combined function optic fibre pour into produced is more even, and the pumping of kilowatt level can be realized to single pump arm pours into, and can realize the bi-polar pumping simultaneously, has better practicality.
In order to detail the narrow linewidth fiber laser disclosed in the above embodiment, the seed source generation unit further includes an optical isolator disposed between the resonant cavity and the side pump fiber.
To elaborate on the narrow linewidth fiber laser disclosed in the above embodiments, the seed source generation unit further includes a mode field adapter disposed between the optical isolator and the side pump fiber. The mode field adapter matches the core and cladding diameters of the front and rear optical fibers and injects seed light into the amplification stage.
In order to detail the narrow linewidth fiber laser disclosed in the above embodiment, the seed source generating unit further includes a first cladding optical stripper disposed between the resonator and the optical isolator for thoroughly stripping the residual pump light.
Wherein, the cladding light stripper can realize 500W cladding light stripping, and the signal bearing power is more than 3000W.
In order to detail the narrow linewidth fiber laser disclosed in the above embodiment, the amplification unit further includes a second cladding optical stripper disposed at both ends of the side pump fiber for completely stripping the residual pump light.
To elaborate on the narrow linewidth fiber laser disclosed in the above embodiments, the first cladding stripper and the second cladding stripper may be present in the entire narrow linewidth fiber laser at the same time or alternatively.
In order to detail the narrow-linewidth fiber laser disclosed in the above embodiment, the LD pump source injects the pump fiber input end and the pump fiber output end of the side pump fiber, the seed light output by the pre-amplification unit is amplified by the active fiber of the side pump fiber, and when the LD pump source is connected to the pump fiber input end in the side pump fiber, the forward injection of multiple pump sources is achieved; when the LD pumping source is connected with the output end of the pumping fiber in the side pumping fiber, the reverse injection of the multi-path pumping source is achieved; when the LD pumping source is simultaneously connected with the input end of the pumping fiber in the side pumping fiber and the output end of the pumping fiber in the side pumping fiber, the LD pumping source is used for realizing the bidirectional injection of the side pumping fiber.
When the LD pump source is connected with the input end of the pump fiber in the side pump fiber, the pump light is injected into the pump fiber, the pump fiber and the active fiber in the side pump fiber are in a fusion attachment state, and the pump light in the pump fiber is coupled into the active fiber in the side pump fiber in an evanescent wave coupling mode so as to achieve the forward injection of multiple pump sources;
when the LD pump source is connected with the output end of the pump fiber in the side pump fiber, the pump light is injected into the pump fiber, the pump fiber and the active fiber in the side pump fiber are in a fusion attachment state, and the pump light in the pump fiber is coupled into the active fiber in the side pump fiber in an evanescent wave coupling mode so as to achieve the reverse injection of multiple pump sources.
When the LD pumping source is connected with the input end of the pumping fiber in the side pumping fiber and the output end of the side pumping fiber at the same time, pumping light is injected into the pumping fiber, the pumping fiber and the active fiber in the side pumping fiber are in a fusion attachment state, and the pumping light in the pumping fiber is coupled into the active fiber in the side pumping fiber in an evanescent wave coupling mode to realize the bidirectional injection of the side pumping fiber.
In order to detail the narrow-linewidth fiber laser disclosed in the above embodiment, the core diameter of the high-reflection grating fiber pigtail and the core diameter of the low-reflection output grating fiber pigtail are in the range of 5-30 μm; the parameter ranges of the cladding diameter of the high-reflection grating fiber pigtail and the cladding diameter of the low-reflection output grating fiber pigtail are 125-400 mu m.
For example: the core of the high reflecting grating optical fiber and the core of the low reflecting grating optical fiber are 5 mu m, 6 mu m, 7 mu m, 8 mu m, … …, 28 mu m, 29 mu m, 30 mu m and the like, and the sizes of the cores are larger or smaller than the steps. The high reflective grating fiber cladding and the low reflective output grating cladding are 125 μm, 140 μm, 155 μm, … …, 355 μm, 370 μm, 385 μm, 400 μm, etc., and various cladding sizes greater or less than the above steps.
In order to detail the pulse fiber laser disclosed in the above embodiment, the LD pump source-tail fiber core range is 105-; the cladding range of the LD pump source tail fiber is 125-440 μm. The fiber core size of the LD pumping source is smaller than the cladding size of the LD pumping source.
For example: LD pump source core size/LD pump source cladding size 105 μm/125 μm, 150 μm/180 μm, 236 μm/278 μm, 300 μm/370 μm, 350 μm/400 μm, … …, 400 μm/440 μm, etc., and various cladding sizes greater or less than the above steps.
The seed spectrum range is 1050-1090nm, and the 3dB bandwidth is 0.05-0.2 nm.
For example: the seed spectrum may be 1050nm, 1060nm, 1070nm, … …, 1090nm, etc., and various spectral values that are greater or less than the above-described steps.
In order to detail the narrow linewidth fiber laser disclosed in the above embodiment, the narrow linewidth fiber laser further includes a laser beam output head for outputting the amplified seed light. The laser output adopts a QBH output head. The QBH output head can endure laser output of a signal of more than 5000W.
In order to detail the narrow-linewidth fiber laser disclosed in the above embodiment, the narrow-linewidth fiber laser further includes a beam combiner, the LD pump source is injected into the resonant cavity through the beam combiner, and the beam combiner is configured to combine signals of the multiple pump sources to form the LD pump source.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment 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.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A narrow linewidth fiber laser based on a side pumping technology is characterized by comprising a seed source generation unit and an amplification unit: the seed source generating unit is a resonant cavity used for generating corresponding seed light according to parameters of the adopted high-reflection grating and low-reflection output grating when the LD pumping source is injected; the amplification unit is a side pumping optical fiber for amplifying the seed light when injecting the LD pumping source; the resonant cavity comprises a high-reflection grating, an active optical fiber and a low-reflection output optical fiber; the high-reflection grating, the active optical fiber and the low-reflection output optical fiber are sequentially connected.
2. The narrow linewidth fiber laser of claim 1, wherein the seed source generation unit further comprises an optical isolator disposed between the resonant cavity and the side pump fiber.
3. The narrow linewidth fiber laser of claim 1 or 2, wherein the seed source generation unit further comprises a mode field adapter disposed between an optical isolator and a side pump fiber.
4. The narrow linewidth fiber laser of claim 3, wherein the seed source generation unit further comprises a first cladding light stripper disposed between the resonant cavity and the optical isolator; the amplifying unit further comprises a second cladding light stripper, and the second cladding light strippers are arranged at two ends of the side pumping optical fiber.
5. The narrow-linewidth fiber laser of claim 1, 2 or 4, wherein an LD pump source is injected into a pump fiber input end and a pump fiber output end of the side pump fiber, and the seed light output by the pre-amplification unit is amplified by an active fiber of the side pump fiber; when the LD pumping source is connected with the input end of the pumping fiber in the side pumping fiber, the forward injection of the multi-path pumping source is achieved; when the LD pumping source is connected with the output end of the pumping fiber in the side pumping fiber, the reverse injection of the multi-path pumping source is achieved; when the LD pumping source is simultaneously connected with the input end of the pumping fiber in the side pumping fiber and the output end of the pumping fiber in the side pumping fiber, the LD pumping source is used for realizing the bidirectional injection of the side pumping fiber.
6. The narrow linewidth fiber laser of claim 5, wherein the high reflective grating fiber pigtail core diameter, low back-output grating fiber pigtail core diameter ranges from 5-30 μ ι η; the parameter ranges of the cladding diameter of the high-reflection grating fiber pigtail and the cladding diameter of the low-reflection output grating fiber pigtail are 125-400 mu m.
7. The narrow linewidth fiber laser of claim 1, 2, 4 or 6, wherein the active fiber core ranges from 5-30 μ ι η; the maximum diameter of the active fiber cladding is 125-400 μm.
8. The narrow linewidth fiber laser of claim 7, wherein the seed spectral range is 1050-1090nm and the 3dB bandwidth is 0.05-0.2 nm.
9. The narrow linewidth fiber laser of claim 7, further comprising a laser output head for outputting amplified seed light.
10. The narrow linewidth fiber laser of claim 7, wherein the LD pump source is injected into the resonant cavity through a combiner, and the combiner is configured to combine signals from the plurality of pump sources to form the LD pump source.
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