CN213184960U - Optical fiber laser - Google Patents
Optical fiber laser Download PDFInfo
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- CN213184960U CN213184960U CN202021210579.1U CN202021210579U CN213184960U CN 213184960 U CN213184960 U CN 213184960U CN 202021210579 U CN202021210579 U CN 202021210579U CN 213184960 U CN213184960 U CN 213184960U
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Abstract
The utility model relates to the field of optical fiber lasers, and discloses an optical fiber laser, which comprises a pumping light source, an optical fiber combiner, an optical resonant cavity, an output head, a cladding light stripper and an induction device; the pumping light source is connected with the optical resonant cavity through the optical fiber beam combiner; a gain optical fiber is arranged in the optical resonant cavity; pump light generated by the pump light source enters the optical resonant cavity through the optical fiber beam combiner and is absorbed by the gain optical fiber to generate laser, and the laser is output through the output head; the cladding light stripper is welded on a non-working arm on the optical fiber combiner and is used for stripping the pump light which is not absorbed by the gain optical fiber; the cladding light stripper is provided with a light absorbing component for absorbing the pump light which is not absorbed by the gain fiber; the sensing device is arranged in the light absorption component and used for detecting the intensity change degree of the pumping light which is not absorbed by the gain fiber. The utility model discloses can detect the operating condition of fiber laser effectively, prevent that the unstable effect of mode from causing the harm to the fiber laser.
Description
Technical Field
The utility model belongs to the fiber laser field, more specifically say, relate to a fiber laser.
Background
The high-power optical fiber laser has obvious advantages in the aspects of beam quality, volume, weight, efficiency, heat dissipation, stability and the like, and gradually replaces the traditional carbon dioxide laser and solid laser to become the core part of laser processing equipment. In the field of industrial processing, high-power fiber lasers are receiving more and more attention and research, and have been widely applied to cutting and welding in the field of metal processing, such as aerospace, high-speed rail, shipbuilding, automobile machine parts, and the like.
Existing high power fiber lasers employ an all-fiber architecture and use a gain fiber (sometimes also referred to as an active fiber) as the gain medium. After the output power of the fiber laser reaches a certain threshold, a mode instability effect occurs in the laser, and the effect can seriously affect the output power and the beam quality of the laser. After the mode instability effect occurs, the continuous increase of the pump light source can cause great harm to the fiber laser.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fiber laser to detect fiber laser's operating condition, prevent that the unstable effect of mode from causing the harm to fiber laser.
In order to achieve the above object, the utility model adopts the following technical scheme: the optical fiber laser comprises a pumping light source, an optical fiber combiner, an optical resonant cavity, an output head, a cladding light stripper and an induction device;
the pumping light source is connected with the optical resonant cavity through the optical fiber beam combiner;
a gain optical fiber is arranged in the optical resonant cavity;
the pump light generated by the pump light source enters the optical resonant cavity through the optical fiber beam combiner and is absorbed by the gain optical fiber to generate laser, and the laser is output through the output head;
the cladding light stripper is welded on a non-working arm on the optical fiber combiner and is used for stripping the pump light which is not absorbed by the gain optical fiber;
the cladding light stripper is provided with a light absorbing component for absorbing the pump light which is not absorbed by the gain fiber;
the sensing device is arranged in the light absorption component and used for detecting the intensity change degree of the pumping light which is not absorbed by the gain fiber.
Optionally, a temperature detection device is further provided, and the temperature detection device is used for detecting the temperature of the light absorption component.
Optionally, the sensing device includes a photoelectric sensor, and is configured to convert a received optical signal into an electrical signal to obtain an optical signal intensity.
Optionally, the electrical signal comprises a current signal or a voltage signal.
Optionally, the light absorbing member includes a metal block.
Optionally, the optical fiber combiner includes a forward combiner and/or a reverse combiner.
Optionally, the optical resonant cavity is further provided with a fiber grating.
Optionally, the fiber grating includes a high-reflection grating and a low-reflection grating.
The utility model provides a fiber laser's beneficial effect lies in: compared with the prior art, the utility model discloses fiber laser through setting up covering light stripper and induction system, can detect fiber laser's operating condition effectively, prevents that mode unstable effect from causing the harm to fiber laser.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an optical fiber laser provided by an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, a fiber laser provided by the present invention will now be described. The fiber laser provided by the embodiment comprises a pumping light source 01, a fiber combiner 02, an optical resonant cavity 03, an output head 04, a cladding stripper 06 and a sensing device 05;
the pumping light source 01 is connected with the optical resonant cavity 03 through the optical fiber beam combiner 02;
a gain fiber 032 is arranged in the optical resonant cavity 03;
the pump light generated by the pump light source 01 enters the optical resonant cavity 03 through the optical fiber combiner 02 and is absorbed by the gain fiber 032 to generate laser, and the laser is output through the output head 04;
the cladding light stripper 06 is welded on the non-working arm of the optical fiber combiner 02 and is used for stripping the pump light which is not absorbed by the gain optical fiber;
the cladding light stripper 06 is provided with a light absorbing member 061 for absorbing the pump light not absorbed by the gain fiber 032;
the sensing means 05 is disposed in the light absorbing member 061 for detecting the intensity variation degree of the pump light not absorbed by the gain fiber.
In this embodiment, the fiber laser includes a pump light source 01, a fiber combiner 02 (such as a forward combiner 021 and a backward combiner 022), an optical resonant cavity 032, an output head 04, an induction device 05, and a cladding stripper 06. The pump light source 01 can generate pump light with high energy. The pump light enters the optical resonant cavity 032 through the optical fiber combiner 02, is absorbed by the gain fiber 032 in the optical resonant cavity 032, and generates laser light. In order to increase the output power of the fiber laser, the fiber laser may be connected to a plurality of pump light sources 01 through a fiber combiner 02. This allows more pump light to enter the optical cavity 032 and excite more laser light.
The optical resonator 03 is provided with a high reflecting grating 031 and a low reflecting grating 033. The high-reflectivity grating 031 has a higher reflectivity than the low-reflectivity grating 033. Laser light generated by the optical resonator 03 is output from the low reflection grating 033.
In some cases, mode instability effects can occur in fiber lasers after the output power of the fiber laser reaches a certain threshold. The mode instability effect may be manifested as a periodic oscillation (either a sine wave or a triangular wave) of the voltage signal. The fluctuating variation of the voltage signal is usually aperiodic if it is not drastic. Mode instability effects can affect the output power and beam quality of the fiber laser. In this situation, if the pump light is continuously added, the fiber laser is greatly damaged. It is therefore necessary to detect the degree of intensity variation of the pump light not absorbed by the gain fiber by the sensing means 05 to determine whether the mode instability effect occurs.
The cladding stripper 06 can be fused to the non-working arm of the fiber combiner 02. A part of the pump light stripped by the cladding stripper 06 is absorbed by the light absorbing member 061, and the other part thereof acts on the sensing device 05 disposed in the light absorbing member 061. The sensing device 05 can detect the degree of intensity change of the pump light not absorbed by the gain fiber. Here, the degree of intensity variation may refer to a fluctuation condition of the pump light in the time domain that is not absorbed by the gain fiber. When the intensity change degree detected by the sensing device 05 is greater than the preset change rate, it can be determined that the current fiber laser is in the mode instability effect. And then feeding the judged information back to a feedback system of the fiber laser to make corresponding adjustment measures and maintain the stable operation of the fiber laser. The corresponding adjustment measure may be to stop increasing or decreasing the input amount of the pump light.
After the cladding stripper guides the pump light out, the light absorbing member 061 may effectively absorb the energy of the pump light, convert the light energy into heat energy, and transfer the heat energy to the environment.
Optionally, a temperature detection device (not shown) is further provided, and the temperature detection device is configured to detect the temperature of the light absorbing member 061.
In this embodiment, a temperature detection device may be provided for detecting the temperature of the light absorbing member 061. The temperature detecting means may be a temperature sensor, and may acquire an electric signal generated based on the temperature and calculate temperature data of the light absorbing member 061 according to the electric signal.
Optionally, when the temperature detected by the temperature detection device is greater than a preset temperature threshold, a first reminding signal is sent.
In this embodiment, the preset temperature threshold may be set according to actual needs. Under the preset temperature threshold, the cladding stripper can work normally and can timely discharge heat out of the fiber laser. When the detected temperature exceeds a preset temperature threshold value, the cladding light stripper is in an abnormal working state, and the fiber laser has the risk of burning out. The first reminding signal can prompt that the current optical fiber laser is abnormal and needs to stop working. In some cases, the first warning signal may also automatically activate a protection mode of the fiber laser to stop the fiber laser.
Optionally, the sensing device 05 includes a photoelectric sensor for converting the received optical signal into an electrical signal to obtain the intensity of the optical signal.
In this embodiment, the photoelectric sensor is a device for converting an optical signal into an electrical signal, and has the advantages of high feedback speed and high detection precision. The photoelectric sensor can feed back the working state of the optical fiber laser in real time.
Optionally, when the intensity variation degree is greater than the preset variation rate, the current mode instability effect is determined, and a second reminding signal is sent.
In this embodiment, the preset light intensity threshold may be set according to actual needs. Under the preset light intensity threshold, the intensity of the pumping light and the reflected light is weak, and the normal work of the fiber laser cannot be influenced. When the intensity of the optical signal is greater than the preset light intensity threshold, the intensities of the pump light and the reflected light are greater, and the normal work of the fiber laser is threatened. The second reminding signal can prompt that the current optical fiber laser is abnormal and needs to stop working. In some cases, the second warning signal may also automatically activate a protection mode of the fiber laser to stop the fiber laser from operating.
Optionally, the electrical signal comprises a current signal or a voltage signal.
In this embodiment, the photoelectric sensor is a device that can convert an optical signal into an electrical signal, and has a fast response speed (generally less than 1 millisecond), and can quickly measure intensity data of the pump light. The generated electrical signals are different according to the type of the photoelectric sensor, and may be current signals or voltage signals.
Optionally, the light absorbing member 061 comprises a metal block.
In this embodiment, a metal block may be used as the light absorbing member of the cladding light stripper. The metal block has stable property, high heat conduction efficiency, lower cost and smaller volume. In particular, the metal block may refer to a metal block having a black case. The metal block accommodates a cladding stripper therein. In addition, a glass tube can be arranged to be connected with the tail end of the non-working arm, and then the glass tube is covered by a metal tube. One end of the metal pipe is connected with the water-cooling heat dissipation plate to conduct out heat. The light coming out of the cladding stripper can be sufficiently absorbed by the metal block.
Optionally, the optical fiber combiner 02 includes a forward combiner and/or a reverse combiner.
In this embodiment, the optical fiber combiner 02 may be a forward combiner, a reverse combiner, or both a forward combiner and a reverse combiner. The laser passes through the reverse beam combiner to be output to the output head without passing through the forward beam combiner. If the forward beam combiner is used independently, the structure is simple, the cost is low, but the influence of the optical nonlinear effect of the optical fiber is large, and the bottleneck is caused when the laser output power is improved. If the reverse beam combiner is used independently, the structure is simple, and the influence of the nonlinear effect of the optical fiber is small. However, since the high-power laser light passes through the backward beam combiner and all the pump light also passes through the backward beam combiner, the pressure of the backward beam combiner is high, and the reliability is reduced. If the forward beam combiner and the reverse beam combiner are used simultaneously, the influence of the nonlinear effect of the optical fiber is small. However, the residual pump light inside the optical fiber between the backward beam combiner and the pump light source 01 may reduce the reliability of the pump light source.
Optionally, the optical resonant cavity 03 is further provided with a fiber grating, where the fiber grating includes a high-reflection grating and a low-reflection grating.
In this embodiment, the optical resonant cavity 03 is provided with a fiber grating. The high-reflectivity grating 031 has a higher reflectivity than the low-reflectivity grating 033. Laser light generated by the optical resonator 03 is output from the low reflection grating 033.
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 (8)
1. A fiber laser is characterized by comprising a pumping light source, a fiber combiner, an optical resonant cavity, an output head, a cladding light stripper and an induction device;
the pumping light source is connected with the optical resonant cavity through the optical fiber beam combiner;
a gain optical fiber is arranged in the optical resonant cavity;
the pump light generated by the pump light source enters the optical resonant cavity through the optical fiber beam combiner and is absorbed by the gain optical fiber to generate laser, and the laser is output through the output head;
the cladding light stripper is welded on a non-working arm on the optical fiber combiner and is used for stripping the pump light which is not absorbed by the gain optical fiber;
the cladding light stripper is provided with a light absorbing component for absorbing the pump light which is not absorbed by the gain fiber;
the sensing device is arranged in the light absorption component and used for detecting the intensity change degree of the pumping light which is not absorbed by the gain fiber.
2. The fiber laser of claim 1, further provided with a temperature detection means for detecting a temperature of the light absorbing member.
3. The fiber laser of claim 1, wherein the sensing device comprises a photosensor for converting a received optical signal into an electrical signal to obtain optical signal strength.
4. The fiber laser of claim 3, wherein the electrical signal comprises a current signal or a voltage signal.
5. The fiber laser of claim 1, wherein the light absorbing component comprises a metal block.
6. The fiber laser of claim 1, wherein the fiber combiner includes a forward combiner and/or a reverse combiner.
7. The fiber laser of claim 1, wherein the optical resonant cavity is further provided with a fiber grating.
8. The fiber laser of claim 7, wherein the fiber grating includes a high-reflectivity grating and a low-reflectivity grating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021210579.1U CN213184960U (en) | 2020-06-24 | 2020-06-24 | Optical fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021210579.1U CN213184960U (en) | 2020-06-24 | 2020-06-24 | Optical fiber laser |
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| CN213184960U true CN213184960U (en) | 2021-05-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572006A (en) * | 2021-07-27 | 2021-10-29 | 光惠（上海）激光科技有限公司 | Dual-wavelength composite optical fiber laser and laser control method |
| CN117410810A (en) * | 2023-12-14 | 2024-01-16 | 中国工程物理研究院激光聚变研究中心 | Anti-reflection cascade pump optical fiber laser |
-
2020
- 2020-06-24 CN CN202021210579.1U patent/CN213184960U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572006A (en) * | 2021-07-27 | 2021-10-29 | 光惠（上海）激光科技有限公司 | Dual-wavelength composite optical fiber laser and laser control method |
| CN113572006B (en) * | 2021-07-27 | 2023-11-21 | 光惠（上海）激光科技有限公司 | Dual-wavelength composite fiber laser and laser control method |
| CN117410810A (en) * | 2023-12-14 | 2024-01-16 | 中国工程物理研究院激光聚变研究中心 | Anti-reflection cascade pump optical fiber laser |
| CN117410810B (en) * | 2023-12-14 | 2024-05-28 | 中国工程物理研究院激光聚变研究中心 | Anti-reflection cascade pump optical fiber laser |
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