CN211605641U - Annular light spot output continuous optical fiber laser with full polarization maintaining optical fiber structure - Google Patents
Annular light spot output continuous optical fiber laser with full polarization maintaining optical fiber structure Download PDFInfo
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- CN211605641U CN211605641U CN202020651711.6U CN202020651711U CN211605641U CN 211605641 U CN211605641 U CN 211605641U CN 202020651711 U CN202020651711 U CN 202020651711U CN 211605641 U CN211605641 U CN 211605641U
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Abstract
The utility model relates to the technical field of fiber laser, in particular to an annular facula output continuous fiber laser with a full polarization maintaining fiber structure, which comprises a first fiber Bragg grating, a first long-period fiber grating, a wavelength division multiplexer, a pumping source, a gain fiber, a second long-period fiber grating, a second fiber Bragg grating, a polarization beam combiner and an output end; the utility model discloses utilize the advantage of polarization maintaining optical fiber anti environmental disturbance, solved present annular facula laser instrument output instability, the inhomogeneous problem of facula, effectively promoted the practicality of the fiber laser of high order mode output, the utility model discloses can be applied to fields such as industrial laser processing, surface plasma arouse, particle manipulation, micro-imaging and light storage.
Description
Technical Field
The utility model relates to a fiber laser technical field specifically is a continuous fiber laser of annular facula output of full polarization maintaining fiber structure.
Background
The axisymmetric polarized light beam is different from the conventional uniform polarized light, the polarization of the axisymmetric polarized light beam is symmetrically distributed in the cross section of the light beam, the intensity of the axisymmetric polarized light beam is a 'donut' with the center as a zero point, the mode of the axisymmetric polarized light beam is 4 degenerate vector modes in an optical fiber LP11 mode, the axisymmetric polarized light mainly comprises radial polarized light and angular polarized light, and the symmetric electric field distribution of the axisymmetric polarized light beam ensures that the axisymmetric polarized light beam has unique application advantages in the fields of surface plasma excitation, optical tweezers, particle acceleration. Therefore, the generation method of the axisymmetric polarized light beam is receiving attention of researchers, but due to errors in the manufacturing process of the optical fiber and crosstalk of modes in the optical fiber, the output light spot of the actual high-order mode optical fiber laser has the problem of instability and non-uniformity, and the obtaining of the annular light spot needs an additional device to relieve the degeneracy of the LP11 mode.
At present, methods for generating a cylindrical vector beam are mainly divided into an active mode and a passive mode. The active mode is mainly to generate a column vector beam by using the loss of some polarization states in the beam by using a birefringent crystal in a cavity or by using the superposition of the polarization states, and the method has the problems of high requirement on the precision of a device and relatively small action range; the passive mode is to add a polarization control device in or outside the laser cavity, and has the disadvantages of easy environmental interference, poor stability and poor practicability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving present high order mode based on ordinary optic fibre and outputting fiber laser power poor stability, the output facula is inhomogeneous, the not strong problem of practicality, has designed the annular facula output continuous fiber laser of a full polarization maintaining fiber structure.
In order to achieve the above object, the utility model provides a following technical scheme: an annular light spot output continuous optical fiber laser with a full polarization maintaining optical fiber structure comprises a first fiber Bragg grating, a first long-period fiber grating, a wavelength division multiplexer, a pumping source, a gain fiber, a second long-period fiber grating, a second fiber Bragg grating, a polarization beam combiner and an output end, wherein the first fiber Bragg grating and the second fiber Bragg grating are used as reflectors of a laser cavity;
wherein the first long-period fiber grating and the second long-period fiber grating are used for converting an LP01 mode into an LP11 mode;
wherein, the pump source is used for generating pump light;
the wavelength division multiplexer is used for coupling the pump light into the resonant cavity;
the gain optical fiber is used for absorbing the pump light and generating signal light;
the polarization beam combiner is used for combining two beams of laser with orthogonal polarization states into an annular light spot;
the output end is used for outputting signal light;
the first end of the wavelength division multiplexer is connected with the first end of the polarization beam combiner sequentially through the first long-period fiber grating and the first Bragg fiber grating, the second end of the wavelength division multiplexer is connected with the second end of the polarization beam combiner sequentially through the gain fiber, the second long-period fiber grating and the second Bragg fiber grating, the first end of the wavelength division multiplexer is further connected with the pump source, and the third end of the polarization beam combiner is connected with the output end.
Preferably, the gain fiber is a polarization maintaining fiber, and the polarization maintaining fiber is doped with rare earth elements.
Preferably, the first fiber bragg grating and the second fiber bragg grating are fiber bragg gratings engraved on the polarization maintaining fiber.
Preferably, the first long-period fiber grating and the second long-period fiber grating are long-period gratings engraved on the polarization-maintaining optical fiber.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model relates to a laser instrument is full fiber structure, compact structure, stability.
2. The laser state of the annular facula finally synthesized by the laser device is coherent laser signals; the stable existence of the LP11 mode in the laser cavity is realized, and an annular light spot with uniform light spot is output; the practicability is stronger.
Drawings
Fig. 1 is a schematic diagram of the connection structure of the device of the present invention.
In the figure: 1-a first long period fiber grating; 2-a first fiber bragg grating; 3-wavelength division multiplexer; 4-a pump source; a 5-gain optical fiber; 6-a second long period fiber grating; 7-a second fiber bragg grating; 8-a polarization beam combiner; 9-output end.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only 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.
Referring to fig. 1, the present invention provides a technical solution: an annular light spot output continuous fiber laser with a full polarization maintaining fiber structure comprises a first Bragg fiber grating 1, a first long-period fiber grating 2, a wavelength division multiplexer 3, a pumping source 4, a gain fiber 5, a second long-period fiber grating 6, a second Bragg fiber grating 7, a polarization beam combiner 8 and an output end 9, wherein the first Bragg fiber grating 1 and the second Bragg fiber grating 7 are Bragg gratings engraved on a polarization maintaining fiber and are used as reflectors of a laser cavity; the first long-period fiber grating 2 and the second long-period fiber grating 6 are long-period gratings engraved on the polarization-maintaining optical fiber and are used for converting the LP01 mode into the LP11 mode; the pump source 4 is used for generating pump light, wherein the pump source 4 is a semiconductor laser with a central wavelength of 976 nm; the wavelength division multiplexer 3 is used for coupling the pump light into the resonant cavity, wherein the wavelength division multiplexer 3 adopts a 976nm/1064nm wavelength division multiplexer; the optical fiber polarization beam combiner comprises a gain optical fiber 5 and an output end 9, wherein the gain optical fiber 5 is used for absorbing pump light and generating signal light, the polarization beam combiner 8 is used for combining two beams of laser with orthogonal polarization states into an annular light spot, the output end 9 is used for outputting the signal light, the first end of the wavelength division multiplexer 3 is connected with the first end of the polarization beam combiner 8 through a first long-period optical fiber grating 2 and a first Bragg optical fiber grating 1 in sequence, the second end of the wavelength division multiplexer 3 is connected with the second end of the polarization beam combiner 8 through the gain optical fiber 5, a second long-period optical fiber grating 6 and a second Bragg optical fiber grating 7 in sequence, the first end of the wavelength division multiplexer 3 is further connected with a pump source 4, and the third end of the polarization beam combiner 8. When the laser is used, after signal light with intracavity resonance passes through the first long-period fiber grating 2 and the second long-period fiber grating 6, the signal light is converted into an LP11 mode from a fundamental mode, two-lobe light spot mode field distribution is formed in the polarization-maintaining optical fiber, the signal light is partially output on the first Bragg fiber grating 1 and the second Bragg fiber grating 7, the remaining signal light returns to a laser cavity, and finally continuous laser is formed by continuous oscillation in the laser cavity, because the polarization beam combiner 8 can combine two beams of polarization signal light into one beam of signal light in orthogonal polarization directions, the output signal light of the left arm and the right arm is connected to the polarization beam combiner 8, one beam of signal light with complete ring shape can be output, and finally two beams of signal light in the output port of the polarization beam combiner can be formed into coherent combined signal light by cutting the length of the output end 9.
In this embodiment, the gain fiber 5 is a polarization maintaining fiber, and the polarization maintaining fiber is doped with rare earth elements, which include but are not limited to ytterbium, erbium, and thulium.
The utility model has the advantages of utilize the superior environment interference immunity of polarization maintaining optical fiber to and control the straight chamber mode of dual output, still have the compact structural characteristic of full optical fiber, make LP11 mode exist at the laser intracavity stability, and guaranteed the evenly distributed of output facula.
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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. An annular light spot output continuous optical fiber laser of a full polarization maintaining optical fiber structure, comprising:
a first fiber Bragg grating (1);
a first long-period fiber grating (2);
a wavelength division multiplexer (3);
a pump source (4);
a gain fiber (5);
a second long-period fiber grating (6);
a second fiber Bragg grating (7);
polarization beam combiner (8) and
the output end (9) is used as a reflector of a laser cavity by the first fiber Bragg grating (1) and the second fiber Bragg grating (7);
wherein the first long period fiber grating (2) and the second long period fiber grating (6) are used for converting an LP01 mode into an LP11 mode;
wherein the pump source (4) is used for generating pump light;
the wavelength division multiplexer (3) is used for coupling the pump light into the resonant cavity;
wherein, the gain fiber (5) is used for absorbing the pump light and generating signal light;
the polarization beam combiner (8) is used for combining two beams of laser with orthogonal polarization states into an annular light spot;
wherein, the output end (9) is used for outputting signal light;
the first end of wavelength division multiplexer (3) loop through first long period fiber grating (2) and first Bragg fiber grating (1) with the first end of polarization beam combiner (8) links to each other, the second end of wavelength division multiplexer (3) loop through gain fiber (5), second long period fiber grating (6) and second Bragg fiber grating (7) with the second end of polarization beam combiner (8) links to each other, the first end of wavelength division multiplexer (3) still with pump source (4) are connected, the third end of polarization beam combiner (8) with output (9) are connected.
2. The annular light spot output continuous optical fiber laser with the full polarization maintaining optical fiber structure according to claim 1, wherein: the gain fiber (5) is a polarization maintaining fiber, and rare earth elements are doped in the polarization maintaining fiber.
3. The annular light spot output continuous optical fiber laser with the full polarization maintaining optical fiber structure according to claim 1, wherein: the first fiber Bragg grating (1) and the second fiber Bragg grating (7) are Bragg gratings engraved on the polarization maintaining optical fiber.
4. The annular light spot output continuous optical fiber laser with the full polarization maintaining optical fiber structure according to claim 1, wherein: the first long-period fiber grating (2) and the second long-period fiber grating (6) are long-period gratings engraved on the polarization-maintaining optical fiber.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596168A (en) * | 2020-12-21 | 2021-04-02 | 深圳大学 | Vortex light beam generating method and device based on annular spiral fiber grating resonator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596168A (en) * | 2020-12-21 | 2021-04-02 | 深圳大学 | Vortex light beam generating method and device based on annular spiral fiber grating resonator |
| CN112596168B (en) * | 2020-12-21 | 2022-10-18 | 深圳大学 | Vortex light beam generating method and device based on annular spiral fiber grating resonator |
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