CN219394008U - Optical fiber laser - Google Patents

Optical fiber laser Download PDF

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CN219394008U
CN219394008U CN202320548500.3U CN202320548500U CN219394008U CN 219394008 U CN219394008 U CN 219394008U CN 202320548500 U CN202320548500 U CN 202320548500U CN 219394008 U CN219394008 U CN 219394008U
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laser
light
port
pump
fiber laser
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张涛
武国强
鲁开源
叶城委
许阳
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Shanghai B&a Industrial Co ltd
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Shanghai B&a Industrial Co ltd
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Abstract

The utility model relates to a fiber laser, wherein the fiber laser comprises: the device comprises a seed light source, a beam combiner, erbium-ytterbium co-doped fibers, a three-in-one light path combination device, a multimode pump laser and a two-way multimode pump splitter, wherein the three-in-one light path combination device is arranged between the two erbium-ytterbium co-doped fibers, and a monitoring port is further connected to an input end and used for acquiring reference light of the fiber laser; the two-way multimode pump splitter is also connected with the multimode pump laser and the beam combiner. The optical fiber laser adopts a two-stage amplifying structure and filters between the first stage and the second stage, so that the optical signal to noise ratio (OSNR) is effectively increased, the traditional scheme of using EDFA as the first stage to improve the OSNR is avoided, and the optical fiber laser has the advantages of high working temperature, good spectrum quality, low cost, simple driving current and the like.

Description

Optical fiber laser
Technical Field
The utility model relates to the technical field of optical fiber communication, in particular to the technical field of lasers, and specifically relates to an optical fiber laser.
Background
Along with the continuous development of radar technology, the laser radar technology at the vehicle end and the road end is mature gradually, and 1550nm laser radar is widely applied because of the advantages of eye safety, long detection distance, high image definition and the like. The 1550nm optical fiber laser is used as a core component to provide a detection light source for a radar system, and along with the development of radar technology, higher requirements are provided for performance parameters, reliability and manufacturability of the optical fiber laser, such as: the conventional fiber laser technical scheme generally adopts the technical scheme of EDFA+EYDAA, which can obtain high optical performance parameters but does not have high reliability, environmental applicability and manufacturability. Therefore, a high-power fiber laser with excellent performance index, high reliability, simple structure and easy manufacture is very necessary.
Disclosure of Invention
The object of the present utility model is to overcome the drawbacks of the prior art and to provide a highly integrated, highly reliable and high performance fiber laser.
In order to achieve the above object, a fiber laser of the present utility model is specifically as follows:
the optical fiber laser is mainly characterized in that the optical fiber laser comprises: the device comprises a seed light source, a beam combiner, erbium-ytterbium co-doped fibers, a three-in-one light path combination device, a multimode pump laser and a two-way multimode pump splitter, wherein the three-in-one light path combination device is arranged between the two erbium-ytterbium co-doped fibers, and a monitoring port is further connected to an input end and used for acquiring reference light of the fiber laser; the two-way multimode pump splitter is also connected with the multimode pump laser and the beam combiner.
Preferably, the seed light source specifically comprises:
the isolator is arranged in the fiber laser and is used for providing signal light for the fiber laser and preventing ASE noise from entering the fiber laser.
Preferably, the erbium ytterbium co-doped fiber specifically comprises:
the optical amplification device comprises a first erbium-ytterbium co-doped optical fiber and a second erbium-ytterbium co-doped optical fiber, wherein the first erbium-ytterbium co-doped optical fiber and the second erbium-ytterbium co-doped optical fiber are used as gain media for carrying out laser amplification on the optical fiber laser, and the pump light energy is transferred into signal light through absorption of the pump light energy so as to realize optical amplification treatment.
Preferably, the beam combiner specifically comprises:
the device comprises a first beam combiner and a second beam combiner, wherein the first beam combiner is connected with the seed light source, the two-way multimode pump branching device and the first erbium-ytterbium co-doped optical fiber, and the first beam combiner is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into the first erbium-ytterbium co-doped optical fiber together;
the second beam combiner is connected with the second erbium-ytterbium co-doped optical fiber and the two-way multimode pump splitter, and the second beam combiner couples pump light and signal light into the same optical fiber and injects the pump light and the signal light into the second erbium-ytterbium co-doped optical fiber together.
Preferably, the three-in-one optical path combination device specifically includes:
the filter is connected with the first erbium-ytterbium co-doped optical fiber and the monitoring port and is used for carrying out first filtering treatment of ASE noise on forward transmitted signal light and carrying out second filtering treatment of ASE noise on reflected signal light;
the optical splitter is connected with the filter and is used for reflecting the signal light according to a specific proportion and transmitting the rest signal light, wherein the signal light subjected to the optical reflection treatment is connected with the monitoring port and is used for outputting the reference light of the fiber laser; and
and the isolator is connected with the beam splitter and is used for outputting the signal light after light transmission treatment.
Preferably, the multimode pump laser specifically comprises:
the system comprises a first multimode pump laser and a second multimode pump laser, wherein the output ends of the first multimode pump laser and the second multimode pump laser are connected with a two-way multimode pump splitter, and the two-way multimode pump splitter is used for carrying out fixed light splitting treatment on pump light output by the first multimode pump laser and the second multimode pump laser according to a proportion.
Preferably, the two-way multimode pump splitter comprises: COM1 port, COM2 port, ref 1 port, ref2 port, PASS1 port, and PASS2 port, wherein,
the COM1 port is connected with the first multimode pump laser, the COM2 port is connected with the second multimode pump laser, the Ref 1 port and the Ref2 port are both connected with the first beam combiner, and the PASS1 port and the PASS2 port are both connected with the second beam combiner.
Preferably, the output end of the fiber laser is further provided with a third isolator, the first end of the third isolator is connected with the second beam combiner, the second end of the third isolator is externally connected with an output port, and the output port is used for outputting high-power laser generated by the fiber laser.
The fiber laser realizes extremely simple optical path design by adopting a highly integrated ISO+seed laser, a BPF+TAP+ISO hybrid device and a two-way multimode pumping shunt. In addition, the design scheme adopts a two-stage amplification scheme, so that the device has ultrahigh OSNR output, and meanwhile, the TAP end of the laser is directly output by an intermediate stage to serve as reference light, so that the loss of output power is effectively improved, the reliability of the device is improved, and the device has good delay characteristics.
Drawings
Fig. 1 is a schematic structural diagram of a fiber laser according to the present utility model.
Fig. 2 is a schematic structural diagram of a three-in-one optical path combination device according to the present utility model.
Fig. 3 is a schematic structural diagram of a two-way multimode pump splitter according to the present utility model.
Detailed Description
In order to more clearly describe the technical contents of the present utility model, a further description will be made below in connection with specific embodiments.
Before describing in detail embodiments that are in accordance with the present utility model, it should be observed that 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.
Referring to fig. 1, the fiber laser of the present utility model includes: the device comprises a seed light source, a beam combiner, erbium-ytterbium co-doped fibers, a three-in-one light path combination device, a multimode pump laser and a two-way multimode pump splitter, wherein the three-in-one light path combination device is arranged between the two erbium-ytterbium co-doped fibers, and a monitoring port is further connected to an input end and used for acquiring reference light of the fiber laser; the two-way multimode pump splitter is also connected with the multimode pump laser and the beam combiner.
As a preferred embodiment of the present utility model, the seed light source specifically includes:
the isolator is arranged in the fiber laser and is used for providing signal light for the fiber laser and preventing ASE noise from entering the fiber laser.
As a preferred embodiment of the utility model, the erbium-ytterbium co-doped fiber specifically comprises:
the optical fiber comprises a first erbium-ytterbium co-doped optical fiber and a second erbium-ytterbium co-doped optical fiber, wherein the first erbium-ytterbium co-doped optical fiber and the second erbium-ytterbium co-doped optical fiber are used as gain media for laser amplification of the optical fiber laser, and the gain media are transferred into signal light through absorption of pump light energy so as to realize optical amplification treatment.
As a preferred embodiment of the present utility model, the beam combiner specifically includes:
the device comprises a first beam combiner and a second beam combiner, wherein the first beam combiner is connected with the seed light source, the two-way multimode pump branching device and the first erbium-ytterbium co-doped optical fiber, and the first beam combiner is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into the first erbium-ytterbium co-doped optical fiber together;
the second beam combiner is connected with the second erbium-ytterbium co-doped optical fiber and the two-way multimode pump splitter, and the second beam combiner couples pump light and signal light into the same optical fiber and injects the pump light and the signal light into the second erbium-ytterbium co-doped optical fiber together.
Referring to fig. 2, as a preferred embodiment of the present utility model, the three-in-one optical path combining device specifically includes:
the filter is connected with the first erbium-ytterbium co-doped optical fiber and the monitoring port and is used for carrying out first filtering treatment of ASE noise on forward transmitted signal light and carrying out second filtering treatment of ASE noise on reflected signal light;
the optical splitter is connected with the filter and is used for reflecting the signal light according to a specific proportion and transmitting the rest signal light, wherein the signal light subjected to the optical reflection treatment is connected with the monitoring port and is used for outputting the reference light of the fiber laser; and
and the isolator is connected with the beam splitter and is used for outputting the signal light after light transmission treatment.
As a preferred embodiment of the present utility model, the multimode pump laser specifically includes:
the system comprises a first multimode pump laser and a second multimode pump laser, wherein the output ends of the first multimode pump laser and the second multimode pump laser are connected with a two-way multimode pump splitter, and the two-way multimode pump splitter is used for carrying out fixed light splitting treatment on pump light output by the first multimode pump laser and the second multimode pump laser according to a proportion.
Referring to fig. 3, as a preferred embodiment of the present utility model, the two-way multimode pump splitter includes: COM1 port, COM2 port, ref 1 port, ref2 port, PASS1 port, and PASS2 port, wherein,
the COM1 port is connected with the first multimode pump laser, the COM2 port is connected with the second multimode pump laser, the Ref 1 port and the Ref2 port are both connected with the first beam combiner, and the PASS1 port and the PASS2 port are both connected with the second beam combiner.
As a preferred embodiment of the present utility model, the output end of the fiber laser is further provided with a third isolator, the first end of the third isolator is connected with the second beam combiner, the second end of the third isolator is externally connected with an output port, and the output port is used for outputting high-power laser generated by the fiber laser.
Referring to fig. 1, the following details of the functional components of the fiber laser according to the present embodiment will be described with reference to fig. 1:
seed light source with isolator: the seed light source as the laser provides signal light for the laser, and the seed light source is integrated with a two-stage isolator to prevent ASE light or other back-to-back light of the first-stage amplifier from entering the seed laser. Preventing the seed laser from being broken down by return light.
A first beam combiner: pump light and signal light are coupled into the same optical fiber and injected into the first erbium ytterbium co-doped optical fiber together.
Two-way multimode pump splitter: the PUMP light of the first multimode PUMP laser (PUMP 1) and the PUMP light of the second multimode PUMP laser (PUMP 2) are split into fixed splitting ratios independently.
The first erbium-ytterbium co-doped fiber: the gain medium of laser amplification absorbs the energy of the pumping light and transfers the energy to the signal light to realize the optical amplification.
Three-in-one optical path combination device: the filter is used for filtering the light output by the first stage and removing ASE noise, the optical splitter is used for dividing the signal light into 2 paths, and the isolator is used for preventing return light from entering the first stage amplifier to influence the amplification of the front stage.
The second erbium ytterbium co-doped fiber: the gain medium of laser amplification absorbs the energy of the pumping light and transfers the energy to the signal light to realize the optical amplification.
A second beam combiner: pump light and signal light are coupled into the same optical fiber and injected into a second erbium ytterbium co-doped optical fiber together.
Monitoring ports: an output power monitoring port is provided for the laser.
An output port: a high power laser output port. The laser light exits from the port.
In practical application, the working principle of the fiber laser of the technical scheme is as follows:
the seed laser with the two-stage isolator emits weak pulse signal light, then enters the first erbium-ytterbium co-doped optical fiber through the first beam combiner, the active optical fiber amplifies the signal light after absorbing the pump light and generates partial ASE, the signal light and the ASE are transmitted out of EYDCF1 and then enter the optical path combination device, the filter in the optical path combination device filters the ASE light, and the signal light passes through the filter. And then, the beam splitter in the combined device divides the signal light into 2 beams, one beam is reflected and then directly output through the filter as a monitoring port of the laser, the monitoring port is used for calibrating and monitoring the power of the radar system, the rest signal light continues to be transmitted forwards through ISO and then enters EYDCF2, in EYDCF, the active optical fiber absorbs the pumping light to further amplify the signal light again so as to obtain high power, and the amplified signal light is output after passing through the third isolator.
The transmission path of the pump signal light is: the pumping light emitted by the first multimode pumping laser is transmitted into a two-way multi-mode pumping branching device, the pumping light is divided into 2 ways according to the determined splitting ratio, one way is transmitted into the first-stage amplifier, and the other way is transmitted into the second-stage amplifier. Similarly, the pump light of the second multimode pump light device is divided into 2 paths of determined splitting ratio after passing through the multimode pump splitter, wherein the first path of pump light is transmitted into the first-stage amplifier, and the second path of pump light is transmitted into the second-stage amplifier.
The working principle of the three-in-one optical path combination device of the technical scheme is as follows:
the combined device is a mixed device of a band-pass filter, a beam splitter and an isolator, light of an input device is firstly subjected to denoising treatment through the band-pass filter, and ASE spectrum generated by front-stage amplification is filtered. After that, the signal light reflects a certain percentage of the signal light in the spectroscopic plate and transmits a ratio to a part of the signal light. The reflected signal light is coupled into the optical fiber again and then transmitted, and the transmitted signal light is output through the isolator.
In the practical application process, the combined device has the following technical advantages:
1. the order of the combination modes of the combination devices is BPF+splitter+ISO, and the functions of any device are completely lost when the positions of the devices are adjusted. On the one hand, the BPF provides a filtering function for forward transmitted signal light, so that ASE generated by first-stage amplification is effectively filtered, noise of an output spectrum is effectively reduced, and the quality of a light beam is improved. On the other hand, the reflected signal light is filtered again. For reflected light, the filter filters the reflected return light again, equivalently, the filter provides two filtering actions, ASE noise is reduced by 3dB again, the optical signal to noise ratio of MON output port signal light is effectively improved, and the monitoring and calibration of a radar system are facilitated.
2. The combined device integrates three functional devices, so that the combined device shares the same set of core raw materials such as glass tube, optical fiber and the like, thereby effectively reducing the cost and improving the reliability of the device.
3. The isolator in the hybrid device adopts special ISO, the normal temperature isolator reaches 60dB, and when the temperature is higher than 100 ℃, the isolation degree can still reach 40dB, the effect of the isolator is greatly enhanced in the full temperature range, and the condition that the isolation degree is reduced under the high temperature condition is effectively avoided.
4. The optical fiber of the device is coated by a special material, can meet the working range of-60-150 ℃, and can be suitable for vehicle-mounted radars and harsh working environments thereof.
The working principle of the two-way multimode pumping splitter of the technical scheme is as follows:
and after the pump light is incident from the COM1 port, part of the pump light is split into the Ref 1 port, and the other part of the pump light is transmitted and then is output by the PASS1 port. Similarly, after the pump light is incident from the COM2 port, part of the pump light is split into the Ref2 port, and the other part of the pump light is transmitted and then is output by the PASS2 port.
The two-way multimode pumping splitter has the following technical advantages in the practical application process:
by adopting the two-way branching device solution, branching can be realized by sharing one light splitting sheet, the traditional discrete devices are combined into one, two raw materials are avoided, the cost is effectively saved, and the resources are reduced.
The size of the double-way branching unit is 4.0 multiplied by 30mm, which is consistent with the size of the traditional single-way branching unit, so that the space is effectively saved, and the possibility of realizing an ultra-compact structure of the module is provided.
Furthermore, in combination with a specific product structure, the technical scheme has the following technical innovation in practice:
1. MON mouth (monitoring port) has the intermediate level to export, avoids traditional technical scheme MON mouth to have the output to export, and it possesses following advantage: 1, the traditional scheme is to use the splitter to split light to serve as a MON port after outputting the isolator, and the scheme can realize a good light splitting effect, but the scheme introduces about 0.2-0.5 dB of insertion loss on one hand in the way of adding devices at the output port, and the output power of the laser is in the watt level, so that the signal light of about hundred milliwatts is lost, the efficiency of the laser is greatly reduced on the one hand, and on the other hand, the reliability of the devices and the laser is greatly influenced by converting part of the signal light into heat. Therefore, the MON port is designed as the intermediate stage, and adverse effects caused by high loss of the output port can be effectively avoided. And the power of the intermediate stage is only tens of milliwatts, so that the loss of optical energy is greatly reduced, and the device is operated in a very low power state, so that the reliability is greatly improved.
2. Compared with the scheme that the MON port is arranged at the output port, the light splitting is usually carried out by adopting the scheme that the 99:1 ratio is adopted, however, the laser has kilowatt peak power, and the PD detector is adopted for detection after the output light of the MON port is attenuated again. On the one hand, energy is wasted, and on the other hand, loss points are needed to be increased to adjust output power in the reproduction process, so that production efficiency and production consistency are greatly affected. Finally, the process for realizing the loss point is usually staggered welding, so that the reliability is greatly reduced, and the requirement of high reliability of the vehicle-mounted radar can not be met. The MON port can be detected without re-loss due to relatively low power after being output by the intermediate stage, so that the manufacturing and reliability feasibility are greatly improved.
3. The front stage pump and the rear stage pump are realized by the same pump branch and the beam splitting ratio is fixed, so MON output power and output power show good linear relation, and the monitoring of the output power can be realized without compensation and calibration. Has great manufacturability and production characteristics.
4. The fiber laser is compatible with two working modes of high power and low power. The laser in the low power mode realizes the redundant design of double pumps by adopting only the double multimode pump splitter and two equivalent pumps, and can equivalently start the second pump after one pump fails, thereby effectively improving the reliability of the radar light source and overcoming the problem of high pump failure in the traditional radar light source; in the high power mode, two pumps can simultaneously provide energy for the active optical fiber, and high output power of 2-3W can be realized.
5. The dual-stage amplifying structure is adopted and filtering is carried out between the first stage and the second stage, so that the optical signal to noise ratio (OSNR) is effectively increased, the traditional scheme of using EDFA as the first stage to improve the OSNR is avoided, and the dual-stage amplifying structure has the advantages of high working temperature, good spectrum quality, low cost, simple driving current and the like.
It can be understood that the fiber laser of the present technical scheme is suitable for a 1550nm MOPA fiber pulse laser, but is not limited to the band, and in practical application, the structure can be adaptively modified according to practical product requirements on the premise of conforming to the inventive concept of the present technical scheme, and corresponding modifications are also included in the protection scope of the present disclosure.
It is to be understood that portions of the present utility model may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution device.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, where the program when executed includes one or a combination of the steps of the method embodiments.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
The fiber laser realizes extremely simple optical path design by adopting a highly integrated ISO+seed laser, a BPF+TAP+ISO hybrid device and a two-way multimode pumping shunt. In addition, the design scheme adopts a two-stage amplification scheme, so that the device has ultrahigh OSNR output, and meanwhile, the TAP end of the laser is directly output by an intermediate stage to serve as reference light, so that the loss of output power is effectively improved, the reliability of the device is improved, and the device has good delay characteristics.
In this specification, the utility model has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the utility model. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (8)

1. A fiber laser, said fiber laser comprising: the device comprises a seed light source, a beam combiner, erbium-ytterbium co-doped fibers, a three-in-one light path combination device, a multimode pump laser and a two-way multimode pump splitter, wherein the three-in-one light path combination device is arranged between the two erbium-ytterbium co-doped fibers, and a monitoring port is further connected to an input end and used for acquiring reference light of the fiber laser; the two-way multimode pump splitter is also connected with the multimode pump laser and the beam combiner.
2. The fiber laser of claim 1, wherein the seed light source is specifically:
the isolator is arranged in the fiber laser and is used for providing signal light for the fiber laser and preventing ASE noise from entering the fiber laser.
3. The fiber laser of claim 1, wherein the erbium ytterbium co-doped fiber is specifically:
the optical fiber comprises a first erbium-ytterbium co-doped optical fiber and a second erbium-ytterbium co-doped optical fiber, and is used for providing a gain medium for laser amplification for the fiber laser, and transferring the pump light energy into signal light by absorbing the pump light energy so as to realize optical amplification treatment.
4. A fiber laser according to claim 3, wherein the beam combiner is specifically:
the device comprises a first beam combiner and a second beam combiner, wherein the first beam combiner is connected with the seed light source, the two-way multimode pump branching device and the first erbium-ytterbium co-doped optical fiber, and the first beam combiner is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into the first erbium-ytterbium co-doped optical fiber together;
the second beam combiner is connected with the second erbium-ytterbium co-doped optical fiber and the two-way multimode pump splitter, and the second beam combiner couples pump light and signal light into the same optical fiber and injects the pump light and the signal light into the second erbium-ytterbium co-doped optical fiber together.
5. The fiber laser of claim 3, wherein the three-in-one optical path combiner specifically comprises:
the filter is connected with the first erbium-ytterbium co-doped optical fiber and the monitoring port and is used for carrying out first filtering treatment of ASE noise on forward transmitted signal light and carrying out second filtering treatment of ASE noise on reflected signal light;
the optical splitter is connected with the filter and is used for reflecting the signal light according to a specific proportion and transmitting the rest signal light, wherein the signal light subjected to the optical reflection treatment is connected with the monitoring port and is used for outputting the reference light of the fiber laser; and
and the isolator is connected with the beam splitter and is used for outputting the signal light after light transmission treatment.
6. The fiber laser of claim 4, wherein the multimode pump laser is specifically:
the system comprises a first multimode pump laser and a second multimode pump laser, wherein the output ends of the first multimode pump laser and the second multimode pump laser are connected with a two-way multimode pump splitter, and the two-way multimode pump splitter is used for carrying out fixed light splitting treatment on pump light output by the first multimode pump laser and the second multimode pump laser according to a proportion.
7. The fiber laser of claim 6, wherein the two-way multimode pump splitter comprises: COM1 port, COM2 port, ref 1 port, ref2 port, PASS1 port, and PASS2 port, wherein,
the COM1 port is connected with the first multimode pump laser, the COM2 port is connected with the second multimode pump laser, the Ref 1 port and the Ref2 port are both connected with the first beam combiner, and the PASS1 port and the PASS2 port are both connected with the second beam combiner.
8. The fiber laser of claim 7, wherein the fiber laser is further provided with a third isolator at the output end, the first end of the third isolator is connected with the second beam combiner, the second end of the third isolator is externally connected with an output port, and the output port is used for outputting the high-power laser generated by the fiber laser.
CN202320548500.3U 2023-03-17 2023-03-17 Optical fiber laser Active CN219394008U (en)

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Application Number Priority Date Filing Date Title
CN202320548500.3U CN219394008U (en) 2023-03-17 2023-03-17 Optical fiber laser

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Application Number Priority Date Filing Date Title
CN202320548500.3U CN219394008U (en) 2023-03-17 2023-03-17 Optical fiber laser

Publications (1)

Publication Number Publication Date
CN219394008U true CN219394008U (en) 2023-07-21

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