CN112670808A - Sunlight pumping fiber laser - Google Patents
Sunlight pumping fiber laser Download PDFInfo
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- CN112670808A CN112670808A CN202011443516.5A CN202011443516A CN112670808A CN 112670808 A CN112670808 A CN 112670808A CN 202011443516 A CN202011443516 A CN 202011443516A CN 112670808 A CN112670808 A CN 112670808A
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Abstract
The invention provides a sunlight pumping optical fiber laser, and belongs to the technical field of optical fiber lasers. The laser comprises a Fresnel mirror, a condenser, a hollow-core fiber filter, a first resonant cavity, a second resonant cavity and a laser coupling output device, wherein the condenser, the hollow-core fiber filter, the first resonant cavity, the second resonant cavity and the laser coupling output device are sequentially connected, and a gain fiber is connected between the first resonant cavity and the second resonant cavity. The Fresnel mirror of the optical fiber laser can well collect sunlight, the condenser further collects the sunlight collected by the Fresnel mirror, the sunlight is focused and coupled to enter the hollow-core optical fiber filter, the sunlight is fully utilized, most of the sunlight is absorbed, heat generated by the laser is less, and the laser is easy to dissipate heat.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and relates to a sunlight pumping fiber laser.
Background
Sunlight is used as clean energy and can be inexhaustible. At present, the direct pumping of solid or gas by sunlight to generate laser light has been realized. As early as 1963, the solar-pumped Dy was studied by the American radio corporation2+：CaF2A crystal laser. In 1976, Nd was used3+: YAG crystal, under the pump of sunlight, produce 5 watts laser. Through decades of development, sunlight pumping lasers have also been greatly developed.
However, the existing sunlight pumping laser has the defects that the laser volume is huge, the volume is from several cubic meters to dozens of cubic meters, and the volume is dozens of jin and even hundreds of jin, so the laser is heavy. Meanwhile, as sunlight cannot be fully utilized, most of the sunlight which cannot be absorbed brings large amount of heat to the laser, and heat dissipation becomes a big problem of the sunlight pumping laser.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a sunlight pumping optical fiber laser, which aims to solve the technical problems that: how to make full use of sunlight.
The purpose of the invention can be realized by the following technical scheme:
the solar pumping optical fiber laser is characterized by comprising a Fresnel mirror, a condenser, a hollow optical fiber filter, a first resonant cavity, a second resonant cavity and a laser coupling output device, wherein the condenser, the hollow optical fiber filter, the first resonant cavity, the second resonant cavity and the laser coupling output device are sequentially connected, and a gain optical fiber is connected between the first resonant cavity and the second resonant cavity.
The working principle is as follows: in the optical fiber laser, a condenser, a hollow-core optical fiber filter and a first resonant cavity are sequentially connected through optical fibers, a second resonant cavity and a laser coupling output device are sequentially connected through the optical fibers, a Fresnel mirror is used for collecting sunlight and focusing the collected sunlight on the condenser, the condenser focuses and couples the sunlight into the hollow-core optical fiber filter, the sunlight entering the hollow-core optical fiber filter acts on a gain optical fiber through the resonant cavity to generate stimulated radiation and generate laser, and the generated laser is output through the laser coupling output device. The Fresnel mirror has a good focusing effect, sunlight can be well collected, the condenser further collects the sunlight collected by the Fresnel mirror, the sunlight is focused and coupled into the hollow-core optical fiber filter, most of the sunlight is fully utilized and absorbed, heat generated by the laser is less, and the laser is easy to dissipate heat. In addition, the optical fiber laser adopts a hollow optical fiber filter, most of useless sunlight is filtered by utilizing the special light guiding characteristic of the hollow optical fiber, the heat dissipation cost of the sunlight pumping laser can be greatly reduced, and the laser is smaller and more compact in size.
In order to reduce the volume of a gain medium, the gain optical fiber adopts a rare earth doped microstructure optical fiber, so that effective single mode characteristics can be obtained, and the microstructure optical fiber characteristics can be utilized to manufacture an optical fiber with a large mode field area, so that the mode volume is increased. The optical fiber can be made into dozens of meters or even hundreds of meters, and the output power of the laser is greatly improved.
In the sunlight pumping fiber laser, a plurality of first fiber gratings are arranged in the first resonant cavity, a plurality of second fiber gratings are arranged in the second resonant cavity, the first fiber gratings and the second fiber gratings are in strip shapes, and the first fiber gratings and the second fiber gratings are respectively distributed along the length direction of the first resonant cavity or the second resonant cavity.
The first fiber grating and the second fiber grating respectively form a high-power grating pair, so that the coupling efficiency of light can be greatly improved, and the coupling loss is reduced. The first fiber grating and the second fiber grating mainly play a role of a resonant cavity, the first fiber grating has high light transmittance HT > 99% at a pumping wavelength, the function HR > 99% at a laser wavelength has high reflectivity, the second fiber grating has high light transmittance (50% > HT > 4%) at the laser wavelength, and the second fiber grating has high reflectivity HR > 99% at the pumping wavelength.
In the solar pumping fiber laser, the condenser is in a frustum shape, and the large end of the condenser faces the fresnel mirror. The frustum-shaped condenser can better collect sunlight emitted from the Fresnel mirror, so that the sunlight is more fully utilized.
In the sunlight-pumped fiber laser, the condenser is made of quartz material and has an inner cavity, and a reflecting film is coated on the inner wall of the inner cavity.
The material of the condenser is quartz glass, the inner wall of the condenser is coated with a reflecting film, the anti-resonance film is a gold film, and the reflectivity of the reflecting film to sunlight in the range of 200-2500nm can reach more than 95%.
In the above sunlight-pumped fiber laser, the optical fiber of the hollow-core optical fiber filter is a hollow-core band-gap optical fiber or a hollow-core anti-resonant optical fiber.
According to different gain optical fibers, different hollow-core band gaps or hollow-core anti-resonance optical fibers can be selected, the hollow-core band gaps or the hollow-core anti-resonance optical fibers have a band-pass function in a certain wave band of a solar spectrum, and the pass band of the hollow-core band gaps or the hollow-core anti-resonance optical fibers is consistent with the absorption spectrum of the gain optical fibers.
In the sunlight pumping optical fiber laser, the laser further comprises a semiconductor refrigerating plate, and the hollow optical fiber filter, the first resonant cavity and the second resonant cavity are arranged on the semiconductor refrigerating plate.
The semiconductor refrigeration plate is used for cooling the optical fiber, the working voltage of the semiconductor refrigeration plate is 12v, and the semiconductor refrigeration plate can receive the electric energy provided by the solar panel.
In the sunlight-pumped optical fiber laser, the fresnel mirror is provided with a support, the fresnel mirror is hinged to the support, and the laser further comprises a solar tracking system capable of controlling the fresnel mirror to rotate along with the sunlight direction.
The sun tracking system mainly comprises a photoelectric detection circuit system and a main control circuit system. The photoelectric detection circuit system is mainly used for measuring the direction and the movement track of sunlight, the main control circuit system is used for reading the data of the photoelectric detection circuit system, and the movement track of the Fresnel mirror and the movement track of the solar panel are controlled through the obtained sunlight direction and movement track information.
The rotation of the Fresnel mirror can be controlled through the sun tracking system, so that the Fresnel mirror changes along with the change of the irradiation angle of sunlight, and the Fresnel mirror always forms a better angle with the sunlight, thereby receiving more sunlight irradiation.
In the above sunlight pumping fiber laser, the laser further includes a solar panel, and the semiconductor cooling plate and the solar tracking system are electrically connected to the solar panel, respectively.
The solar panel is used for converting solar energy into electric energy and providing the electric energy for the solar tracking system and the semiconductor refrigerating panel.
In the above solar pumped fiber laser, the fresnel mirror is made of PMMA. The PMMA is polymethyl methacrylate which is also called as acrylic or organic glass, the Fresnel mirror is made of PMMA, the transmittance of sunlight can reach more than 93 percent, and the Fresnel mirror has a very good light transmission effect.
Compared with the prior art, the invention has the following advantages:
1. the Fresnel mirror of the optical fiber laser has a good focusing effect, sunlight can be well collected, the condenser further collects the sunlight collected by the Fresnel mirror, the sunlight is focused and coupled to enter the hollow-core optical fiber filter, most of the sunlight is absorbed, heat generated by the laser is less, and the laser is easy to dissipate heat.
2. The optical fiber laser adopts a hollow optical fiber filter, most of useless sunlight is filtered by utilizing the special light guiding characteristic of the hollow optical fiber, and the heat dissipation cost of the sunlight pumping laser is greatly reduced.
3. The invention adopts the all-fiber laser, greatly reduces the volume of the laser, is convenient for the laser to move or carry, and simultaneously, because the surface area ratio of the optical fiber is larger, the optical fiber laser does not need excessive cooling.
Drawings
FIG. 1 is a schematic diagram of the present sunlight-pumped fiber laser;
FIG. 2 is a schematic diagram of the working principle of the condenser;
FIG. 3 is a schematic diagram of the structure of a hollow core anti-resonant fiber.
In the figure, 1 a fresnel mirror; 2, a condenser; 3, a hollow fiber filter; 4 a first resonant cavity; 5 a second resonant cavity; 6 laser coupling output device; 7 a gain fiber; 8 a first fiber grating; 9 a second fiber grating; 10 inner cavity; 11 a semiconductor chilling plate; 12, a bracket; 13 a sun tracking system; 14 solar panels; 15 sunlight; 16 air; 17 quartz glass.
Detailed Description
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, the laser includes a fresnel mirror 1, a condenser 2, a hollow fiber filter 3, a first resonant cavity 4, a second resonant cavity 5, and a laser coupling output device 6, wherein the condenser 2, the hollow fiber filter 3, the first resonant cavity 4, the second resonant cavity 5, and the laser coupling output device 6 are sequentially connected, and a gain fiber 7 is connected between the first resonant cavity 4 and the second resonant cavity 5.
In the optical fiber laser, a condenser 2, a hollow-core optical fiber filter 3 and a first resonant cavity 4 are sequentially connected through optical fibers, a second resonant cavity 5 and a laser coupling output device 6 are sequentially connected through the optical fibers, a Fresnel mirror 1 is used for collecting sunlight 15 and focusing the collected sunlight 15 on the condenser 2, then the condenser 2 focuses and couples the sunlight 15 into the hollow-core optical fiber filter 3, the sunlight 15 entering the hollow-core optical fiber filter 3 acts with a gain optical fiber 7 through the resonant cavity to generate stimulated radiation and generate laser, and the generated laser is output through the laser coupling output device 6.
As shown in fig. 1, in this embodiment, a plurality of first fiber gratings 8 are disposed in the first resonant cavity 4, a plurality of second fiber gratings 9 are disposed in the second resonant cavity 5, the first fiber gratings 8 and the second fiber gratings 9 are in a strip shape, and the first fiber gratings 8 and the second fiber gratings 9 are respectively distributed along the length direction of the first resonant cavity 4 or the second resonant cavity 5.
The first fiber grating 8 and the second fiber grating 9 respectively form a high-power grating pair, so that the coupling efficiency of light can be greatly improved, and the coupling loss is reduced. The first fiber grating 8 and the second fiber grating 9 mainly play a role of a resonant cavity, the first fiber grating 8 has high light transmittance HT > 99% at a pumping wavelength, the function HR > 99% of high reflectivity at a laser wavelength, the second fiber grating 9 has high light transmittance (50% > HT > 4%) at the laser wavelength, and the high reflectivity HR > 99% at the pumping wavelength.
As shown in fig. 1, in the present embodiment, the condenser 2 is in a frustum shape, and a large end of the condenser 2 faces the fresnel mirror 1. The frustum-shaped condenser 2 can better collect the sunlight 15 emitted from the Fresnel mirror 1, so that the sunlight 15 can be more fully utilized.
As shown in fig. 2, in the present embodiment, the condenser 2 is made of quartz material, and the condenser 2 has an inner cavity 10, and a reflective film is coated on the inner wall of the inner cavity 10.
The material of the condenser 2 is generally quartz glass 17, the inner wall of which is coated with a reflective film, the anti-resonance film is generally a gold film, and the reflectivity of the reflective film to the sunlight 15 within the range of 200-.
As shown in fig. 3, in the present embodiment, the optical fiber of the hollow-core optical fiber filter 3 is a hollow-core anti-resonant optical fiber.
As another example, the optical fiber of the hollow-core fiber filter 3 may be a hollow-core band-gap fiber.
According to different gain fibers 7, different hollow-core band gaps or hollow-core anti-resonance fibers can be selected, wherein the hollow-core band gaps or the hollow-core anti-resonance fibers have a band-pass function in a certain wave band of a sunlight 15 spectrum, and the pass band of the hollow-core band gaps or the hollow-core anti-resonance fibers is consistent with the absorption spectrum of the gain fibers 7.
As shown in fig. 1, in this embodiment, the laser further includes a semiconductor refrigeration plate 11, and the hollow-core fiber filter 3, the first resonant cavity 4, and the second resonant cavity 5 are disposed on the semiconductor refrigeration plate.
The semiconductor cooling plate 11 is used for cooling the optical fiber, and the operating voltage of the semiconductor cooling is 12v, which can receive the electric energy provided by the solar panel 14.
As shown in fig. 1, in the present embodiment, the fresnel mirror 1 has a support 12, the fresnel mirror 1 is hinged on the support 12, and the laser further includes a solar tracking system 13 capable of controlling the rotation of the fresnel mirror 1 along with the direction of the sunlight 15.
The rotation of the Fresnel mirror 1 can be controlled by the sun tracking system 13, so that the Fresnel mirror 1 changes along with the change of the irradiation angle of the sunlight 15, and the Fresnel mirror 1 always forms a better angle with the sunlight 15, thereby receiving more sunlight 15 irradiation.
As shown in fig. 1, in the present embodiment, the laser further includes a solar panel 14, and the semiconductor cooling plate 11 and the solar tracking system 13 are electrically connected to the solar panel 14 respectively.
The solar panels 14 are used to convert solar energy into electrical energy for providing electrical energy to the solar tracking system 13 and the semiconductor cooling panels 11.
As an example, the fresnel mirror 1 is made of PMMA. The PMMA is polymethyl methacrylate which is also called as acrylic or organic glass, the Fresnel mirror 1 is made of PMMA, the transmittance of sunlight 15 can reach more than 93 percent, and the Fresnel mirror has a very good light transmission effect.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a sunshine pumping fiber laser, its characterized in that, the laser includes fresnel mirror (1), spotlight ware (2), hollow fiber filter (3), first resonant cavity (4), second resonant cavity (5) and laser coupling follower (6) connect gradually, be connected with gain optic fibre (7) between first resonant cavity (4) and second resonant cavity (5).
2. A sun-pumped fiber laser according to claim 1, wherein a plurality of first fiber gratings (8) are disposed in the first resonant cavity (4), a plurality of second fiber gratings (9) are disposed in the second resonant cavity (5), the first fiber gratings (8) and the second fiber gratings (9) are in the shape of strips, and the first fiber gratings (8) and the second fiber gratings (9) are respectively distributed along the length direction of the first resonant cavity (4) or the second resonant cavity (5).
3. A solar-pumped fiber laser according to claim 1, characterized in that the condenser (2) is frustum-shaped, with the large end of the condenser (2) facing the fresnel mirror (1).
4. A solar-pumped fiber laser according to claim 1, characterized in that the condenser (2) is made of quartz material, the condenser (2) having an inner cavity (10), the inner wall of the inner cavity (10) being coated with a reflective film.
5. A solar pumped fiber laser according to claim 1, wherein the optical fiber of the hollow core fiber filter (3) is a hollow core band gap fiber or a hollow core anti-resonant fiber.
6. A sun pumped fiber laser according to claim 1, wherein said laser further comprises a semiconductor cold plate (11), said hollow core fiber filter (3), first resonant cavity (4), second resonant cavity (5) being arranged on said semiconductor cold plate.
7. A sun pumped fiber laser according to claim 6, wherein the Fresnel mirror (1) has a mount (12), the Fresnel mirror (1) being hinged on the mount (12), the laser further comprising a sun tracking system (13) capable of controlling the rotation of the Fresnel mirror (1) with the direction of the sun.
8. A sun pumped fiber laser according to claim 7, wherein the laser further comprises a solar panel (14), the semiconductor chilling panel (11) and the solar tracking system (13) being electrically connected to the solar panel (14), respectively.
9. A sun pumped fiber laser according to claim 1, wherein the fresnel mirror (1) is made of PMMA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011443516.5A CN112670808A (en) | 2020-12-11 | 2020-12-11 | Sunlight pumping fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011443516.5A CN112670808A (en) | 2020-12-11 | 2020-12-11 | Sunlight pumping fiber laser |
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| CN112670808A true CN112670808A (en) | 2021-04-16 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080050078A1 (en) * | 2006-07-25 | 2008-02-28 | Digonnet Michel J | Apparatus and methods using hollow-core fiber tapers |
| CN102082390A (en) * | 2010-12-20 | 2011-06-01 | 长春理工大学 | Sunlight fiber beam pumping solid laser |
| US20120307251A1 (en) * | 2011-06-01 | 2012-12-06 | Honeywell International, Inc. | High performance hollow-core optical-fiber filter for optical rotation sensing |
| US20130070252A1 (en) * | 2011-09-21 | 2013-03-21 | Honeywell International Inc. | Systems and methods for a hollow core resonant filter |
| CN104124301A (en) * | 2013-04-25 | 2014-10-29 | 鸿富锦精密工业（深圳）有限公司 | Solar light-collecting system |
| CN106602393A (en) * | 2016-12-31 | 2017-04-26 | 浙江师范大学 | Method for realizing laser output of erbium-doped optical fiber laser based on solar pumping |
| CN110544866A (en) * | 2019-07-17 | 2019-12-06 | 华南理工大学 | Sunlight-based efficient pumping single-frequency fiber laser |
| CN111555105A (en) * | 2020-05-26 | 2020-08-18 | 王旭 | Solar pump and driven laser system |
-
2020
- 2020-12-11 CN CN202011443516.5A patent/CN112670808A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080050078A1 (en) * | 2006-07-25 | 2008-02-28 | Digonnet Michel J | Apparatus and methods using hollow-core fiber tapers |
| CN102082390A (en) * | 2010-12-20 | 2011-06-01 | 长春理工大学 | Sunlight fiber beam pumping solid laser |
| US20120307251A1 (en) * | 2011-06-01 | 2012-12-06 | Honeywell International, Inc. | High performance hollow-core optical-fiber filter for optical rotation sensing |
| US20130070252A1 (en) * | 2011-09-21 | 2013-03-21 | Honeywell International Inc. | Systems and methods for a hollow core resonant filter |
| CN104124301A (en) * | 2013-04-25 | 2014-10-29 | 鸿富锦精密工业（深圳）有限公司 | Solar light-collecting system |
| CN106602393A (en) * | 2016-12-31 | 2017-04-26 | 浙江师范大学 | Method for realizing laser output of erbium-doped optical fiber laser based on solar pumping |
| CN110544866A (en) * | 2019-07-17 | 2019-12-06 | 华南理工大学 | Sunlight-based efficient pumping single-frequency fiber laser |
| CN111555105A (en) * | 2020-05-26 | 2020-08-18 | 王旭 | Solar pump and driven laser system |
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