CN111193173A - Narrow linewidth fiber laser based on side pumping technology - Google Patents
Narrow linewidth fiber laser based on side pumping technology Download PDFInfo
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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
- H01S3/05—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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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Abstract
本申请涉及光电子技术领域，涉及一种基于侧面泵浦技术的窄线宽光纤激光器。本申请包括种子源产生单元和放大单元：所述种子源产生单元包括谐振腔；放大单元包括侧面泵浦光纤；谐振腔，用于在注入LD泵浦源时，根据采用的高反光栅、低反输出光栅参数产生对应的种子光；侧面泵浦光纤，用于在注入LD泵浦源时，放大所述种子光；激光输出头，用于输出放大后的种子光；所述谐振腔包括高反光栅、有源光纤和低反输出光纤；所述高反光栅引入端与合束器引出端连接；高反光栅引出端与有源光纤输入端连接；低反输出光纤引入端与有源光纤输出端连接。本申请采用全反向泵浦方式能更好的抑制非线性效应，提高最大输出功率。
The present application relates to the field of optoelectronic technology, and relates to a narrow linewidth fiber laser based on side pumping technology. The present application includes a seed source generating unit and an amplifying unit: the seed source generating unit includes a resonant cavity; the amplifying unit includes a side pumping fiber; The inverse output grating parameters generate the corresponding seed light; the side pump fiber is used to amplify the seed light when injected into the LD pump source; the laser output head is used to output the amplified seed light; the resonant cavity includes a high Inverse grating, active fiber and low-reflection output fiber; the high-reflection grating lead-in end is connected with the beam combiner lead-out end; the high-reflection grating lead-in end is connected with the active fiber input end; the low-reflection output fiber lead-in end is connected with the active fiber output connection. The application of the full-reverse pumping method can better suppress the nonlinear effect and improve the maximum output power.
Description
Technical Field
The application relates to the technical field of photoelectrons, in particular to a narrow linewidth fiber laser based on a side pumping technology.
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.
Disclosure of Invention
The application provides a narrow linewidth fiber laser based on side pumping technology to solve the technical problem that prior art exists. The adoption of a full-reverse pumping mode can better inhibit the nonlinear effect threshold value and improve the maximum output power.
The embodiment of the application is realized by the following steps:
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 comprises a resonant cavity; the amplification unit comprises a side pumping optical fiber; the resonant cavity is 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 side pumping optical fiber is used for amplifying the seed light when the LD pumping source is injected; 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. Has the advantages that: the beam combiner, the high-reflection grating, the active optical fiber, the low-reflection grating, the cladding light stripper and the isolator are sequentially connected to form seed light output by narrow-band laser; when the narrow-band reflection grating with the low reflection grating reflectivity bandwidth of 0.05-0.15nm is adopted, narrow-line-width seed light output can be realized.
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 cladding light stripper being disposed between the resonant cavity and the optical isolator; the amplification unit further comprises a second cladding light stripper, and the 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 range from 5 to 30; 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 250-1000 mu m.
Preferably, the active fiber core range in the side-pumped fiber is 5-30 μm; the maximum diameter of the active fiber cladding in the side-pumped fiber 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 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.
Preferably, the narrow-linewidth fiber laser further includes a laser beam output head, and the laser output head is configured to output the amplified seed light.
To sum up, the narrow linewidth fiber laser based on the side pumping technology provided by the embodiment of the present application has the following beneficial effects:
(1) the narrow linewidth fiber laser built based on the side pumping fiber has stronger pumping injection capacity.
(2) The narrow linewidth fiber laser built based on the side pumping fiber is particularly suitable for bidirectional pumping and full-reverse pumping, and can well inhibit spectrum broadening and nonlinear effect.
(3) This application is based on narrow linewidth fiber laser heat distribution that side pump optic fibre built is even, safe and reliable more.
(4) The side-pumped optical fiber-based optical fiber beam combiner is free from beam quality cracking caused by welding spots inside the end-pumped beam combiner.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
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 cross-sectional view of a side-pumped optical fiber according to an embodiment of the present invention;
FIGS. 5(a), (b) are schematic cross-sectional views of a side-pumped optical fiber according to another embodiment of the present invention;
FIGS. 6(a) and (b) are schematic cross-sectional views of a side-pumped fiber according to still another embodiment of the present invention.
Icon: .
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
The technical solution in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
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 comprises a resonant cavity; the amplification unit comprises a side pumping optical fiber; the resonant cavity is 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 side pumping optical fiber is used for amplifying the seed light when the LD pumping source is injected; 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 are connected in sequence.
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 injected into the amplifying unit through the side pumping optical fiber active input fiber, and the seed light amplification is completed in the amplifying unit 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 fibers) 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.
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 embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
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 comprises a resonant cavity; the amplification unit comprises a side pumping optical fiber;
the resonant cavity is 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 side pumping optical fiber is used for amplifying the seed light when the LD pumping source is injected;
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 in the side-pumped fiber ranges from 5-30 μ ι η; the maximum diameter of the active fiber cladding in the side-pumped fiber 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 combiner, wherein the LD pump source is injected into the resonant cavity through the combiner, and the combiner is configured to combine signals of the plurality of pump sources to form the LD pump source.
10. The narrow linewidth fiber laser of claim 7, further comprising a laser output head for outputting amplified seed light.
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