MOPA fiber laser
阅读说明:本技术 一种mopa光纤激光器 (MOPA fiber laser ) 是由 潘永伟 于 2020-05-29 设计创作,主要内容包括:本发明实施例公开了一种MOPA光纤激光器。该MOPA光纤激光器包括:种子源单元、环形器、第一级放大单元和第二级放大单元;种子源单元的输出端与环形器的第一端连接,第一级放大单元的输入输出端与环形器的第二端连接;第一级放大单元用于对种子源单元出射的种子源进行双程放大;第二级放大单元的输入端与环形器的第三端连接,第二级放大单元用于对第一级放大单元输出的光束进行放大。本发明实施例提供的技术方案可以提高斜率效率,减小增益光纤的长度。(The embodiment of the invention discloses an MOPA fiber laser. The MOPA fiber laser comprises: the device comprises a seed source unit, a circulator, a first-stage amplification unit and a second-stage amplification unit; the output end of the seed source unit is connected with the first end of the circulator, and the input end and the output end of the first-stage amplification unit are connected with the second end of the circulator; the first-stage amplification unit is used for carrying out double-pass amplification on the seed source emitted by the seed source unit; the input end of the second-stage amplification unit is connected with the third end of the circulator, and the second-stage amplification unit is used for amplifying the light beam output by the first-stage amplification unit. The technical scheme provided by the embodiment of the invention can improve the slope efficiency and reduce the length of the gain optical fiber.)
1. A MOPA fiber laser, comprising: the device comprises a seed source unit, a circulator, a first-stage amplification unit and a second-stage amplification unit;
the output end of the seed source unit is connected with the first end of the circulator, and the input end and the output end of the first-stage amplification unit are connected with the second end of the circulator; the first-stage amplification unit is used for carrying out double-pass amplification on the seed source emitted by the seed source unit;
the input end of the second-stage amplification unit is connected with the third end of the circulator, and the second-stage amplification unit is used for amplifying the light beam output by the first-stage amplification unit.
2. The MOPA fiber laser of claim 1, wherein the first stage amplification unit comprises: the device comprises a wavelength division multiplexer, a first gain fiber, a reflection filter and a first pumping source;
the seed source end of the wavelength division multiplexer is connected with the second end of the circulator, the pumping source end of the wavelength division multiplexer is connected with the first pumping source, the common end of the wavelength division multiplexer is connected with the first end of the first gain optical fiber, and the second end of the first gain optical fiber is connected with the reflection filter.
3. The MOPA fiber laser of claim 2, wherein a temperature control unit is integrated in the first pump source, the temperature control unit being configured to control an ambient temperature inside and outside the first pump source within a preset range.
4. The MOPA fiber laser of claim 2, wherein the reflective filter comprises a chirped grating.
5. The MOPA fiber laser of claim 1, wherein the second stage amplification unit employs a counter-pumping approach.
6. The MOPA fiber laser of claim 5, wherein the second stage amplification unit comprises: the device comprises a cladding light stripper, a second gain fiber, a beam combiner, a filter and a second pumping source;
the input end of the cladding light stripper is connected with the third end of the circulator, the output end of the cladding light stripper is connected with the first end of the second gain fiber, the second end of the second gain fiber is connected with the input and output end of the beam combiner, the pump source end of the beam combiner is connected with the second pump source, and the output end of the beam combiner is connected with the filter.
7. The MOPA fiber laser of claim 1, wherein the second stage amplification unit comprises: the device comprises a cladding light stripper, a second gain fiber, a beam combiner, a filter and a second pumping source;
the input end of the beam combiner is connected with the third end of the circulator, the pump source end of the beam combiner is connected with the second pump source, the output end of the beam combiner is connected with the first end of the second gain optical fiber, the second end of the second gain optical fiber is connected with the input end of the cladding light stripper, and the output end of the cladding light stripper is connected with the filter.
8. The MOPA fiber laser of claim 2, wherein the first pump source comprises a single mode pump source and the first gain fiber comprises a single clad fiber.
9. The MOPA fiber laser of claim 6 or 7, wherein the second pump source comprises a multimode pump source and the second gain fiber comprises a double-clad fiber.
10. The MOPA fiber laser of claim 1, further comprising an isolator connected to an output of the second stage amplification unit.
Technical Field
The embodiment of the invention relates to the technical field of fiber lasers, in particular to a MOPA fiber laser.
Background
The optical fiber laser is a laser using rare earth element doped glass optical fiber as a gain medium. The MOPA fiber laser has the advantages of high light-light conversion efficiency, low laser threshold, small volume, light weight, compact structure and the like, and is widely applied to the fields of fiber communication, laser standard cutting and the like.
In the existing MOPA fiber laser, a semiconductor laser is generally used to generate a microwatt-level pulse seed source through circuit direct modulation, and the microwatt-level pulse seed source is amplified through a first-level straight cavity single-clad amplification structure or a straight cavity cascade single-clad amplification structure and then amplified through a double-clad amplification structure, so that high gain is obtained, and power is improved. However, the slope efficiency of the gain fiber in the single-clad amplification structure is low, and the required gain fiber is long, which is not favorable for realizing miniaturization of the fiber laser.
Disclosure of Invention
The invention provides a MOPA fiber laser, which aims to improve the slope efficiency and reduce the length of a gain fiber.
In a first aspect, an embodiment of the present invention provides a MOPA fiber laser, including:
the device comprises a seed source unit, a circulator, a first-stage amplification unit and a second-stage amplification unit;
the output end of the seed source unit is connected with the first end of the circulator, and the input end and the output end of the first-stage amplification unit are connected with the second end of the circulator; the first-stage amplification unit is used for carrying out double-pass amplification on the seed source emitted by the seed source unit;
the input end of the second-stage amplification unit is connected with the third end of the circulator, and the second-stage amplification unit is used for amplifying the light beam output by the first-stage amplification unit.
Optionally, the first-stage amplifying unit includes: the device comprises a wavelength division multiplexer, a first gain fiber, a reflection filter and a first pumping source;
the seed source end of the wavelength division multiplexer is connected with the second end of the circulator, the pumping source end of the wavelength division multiplexer is connected with the first pumping source, the common end of the wavelength division multiplexer is connected with the first end of the first gain optical fiber, and the second end of the first gain optical fiber is connected with the reflection filter.
Optionally, a temperature control unit is integrated in the first pump source, and the temperature control unit is configured to control an ambient temperature inside and outside the first pump source within a preset range.
Optionally, the reflective filter comprises a chirped grating.
Optionally, the second-stage amplification unit adopts a reverse pumping mode.
Optionally, the second-stage amplifying unit includes: the device comprises a cladding light stripper, a second gain fiber, a beam combiner, a filter and a second pumping source;
the input end of the cladding light stripper is connected with the third end of the circulator, the output end of the cladding light stripper is connected with the first end of the second gain fiber, the second end of the second gain fiber is connected with the input and output end of the beam combiner, the pump source end of the beam combiner is connected with the second pump source, and the output end of the beam combiner is connected with the filter.
Optionally, the second-stage amplifying unit includes: the device comprises a cladding light stripper, a second gain fiber, a beam combiner, a filter and a second pumping source;
the input end of the beam combiner is connected with the third end of the circulator, the pump source end of the beam combiner is connected with the second pump source, the output end of the beam combiner is connected with the first end of the second gain optical fiber, the second end of the second gain optical fiber is connected with the input end of the cladding light stripper, and the output end of the cladding light stripper is connected with the filter.
Optionally, the first pump source includes a single-mode pump source, and the first gain fiber includes a single-clad fiber.
Optionally, the second pump source comprises a multimode pump source, and the second gain fiber comprises a double-clad fiber.
Optionally, the amplifier further comprises an isolator, and the isolator is connected with the output end of the second-stage amplifying unit.
According to the MOPA fiber laser provided by the embodiment of the invention, the light beam emitted by the seed source unit is amplified in a double-pass way through the first-stage amplification unit, namely, the light beam is amplified twice, so that the slope efficiency of the first-stage amplification unit can be improved, the length of a gain fiber in the first-stage amplification unit is reduced, and the MOPA fiber laser is beneficial to realizing the volume.
Drawings
Fig. 1 is a schematic structural diagram of a MOPA fiber laser provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a MOPA fiber laser provided in an embodiment of the present invention;
FIG. 3 is a spectrum diagram of a MOPA fiber laser provided by an embodiment of the invention;
fig. 4 is a full temperature test result diagram of a MOPA fiber laser provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In view of the technical problems described in the background, an embodiment of the present invention provides a MOPA fiber laser, including:
the device comprises a seed source unit, a circulator, a first-stage amplification unit and a second-stage amplification unit;
the output end of the seed source unit is connected with the first end of the circulator, and the input end and the output end of the first-stage amplification unit are connected with the second end of the circulator; the first-stage amplification unit is used for carrying out double-pass amplification on the seed source emitted by the seed source unit;
the input end of the second-stage amplification unit is connected with the third end of the circulator, and the second-stage amplification unit is used for amplifying the light beam output by the first-stage amplification unit.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a MOPA fiber laser provided in an embodiment of the present invention. Referring to fig. 1, the MOPA fiber laser includes: the seed source device comprises a
The first-
Optionally, the
Optionally, the
Optionally, the second pump source comprises a multimode pump source and the
Specifically, the working process of the first
Specifically, the working process of the second
According to the MOPA fiber laser provided by the embodiment of the invention, the first-
Fig. 2 is a schematic structural diagram of a MOPA fiber laser provided in an embodiment of the present invention. The MOPA fiber laser shown in fig. 2 has the same structure as that of the MOPA fiber laser shown in fig. 1, and the details are not repeated here. Referring to fig. 2, the second-
Specifically, the working process of the first
According to the MOPA fiber laser provided by the embodiment of the invention, the second-
On the basis of the above technical solution, optionally, a temperature control unit is integrated in the
Optionally, the MOPA fiber laser further includes an isolator, and the isolator is connected to the output end of the second-
Specifically, in the MOPA fiber laser, there are various types of design methods for each device, and a typical example will be described below, but the present application is not limited thereto.
Illustratively, the seed source unit may output a DFB direct modulated pulse seed source having a center wavelength of 1550.12nm, the first pump source may include a single mode pump source having a center wavelength of 976nm and an output power of 150mw with a temperature control unit, the first gain fiber may include an ESF having a model SM-EDFL-1480, the second pump source may include a multimode pump source having a center wavelength of 940nm and an output power of 10w, and the second gain fiber may include an EYDF having a model IXF-EYDF-12/130. The output end of the seed source unit is welded with the first end of the circulator, the second end of the circulator is welded with the 1550 end (namely, the seed source end) of the 980/1550 wavelength division multiplexer, and the output end of the first pump source is welded with the 980 end (namely, the pump source end) of the 980/1550 wavelength division multiplexer, so that the seed source and the first pump are optically coupled. The common end of the wavelength division multiplexer is welded with an ESF with the length of 2.5m, the other end of the ESF is welded with a chirped grating with the center wavelength of 1550nm, the 3DB broadband of 6.9nm and the reflectivity of more than 99%. The chirped fiber grating plays a role in reflection so that the reflected signal light participates in secondary amplification, the slope efficiency is improved, the length of the gain fiber is shortened, and meanwhile, the chirped fiber grating plays a role in filtering Amplified Spontaneous Emission (ASE) with the bandwidth beyond 6.9nm, and the signal-to-noise ratio of the output laser is improved. The temperature control unit enables a stable primary pulse output to be obtained at the third end of the circulator, good bedding is made for high and low temperature and good stability, the output power of the first-stage amplifying unit is 37.8mw, and the slope efficiency is 25.2%. The third end of the circulator is welded with one end of the cladding light stripper, the other end of the cladding light stripper is welded with one end of EYDF, stable pulses amplified by one stage are input into EYDF, the beam combiner and the EYDF are integrated, and the other end of the EYDF is welded with a 2w/10kw isolator +200G filter combined device. The cladding light stripper is used for stripping the unused second pumping light. The isolator prevents the return light from affecting the amplification and thus the stability of the output power. The 200G filter can filter ASE to improve the signal-to-noise ratio of the output laser. The second-stage amplification unit adopts reverse pumping, so that the slope efficiency is higher. Finally, the output power of the MOPA optical fiber laser is 1W, the pulse frequency is 5ns/100KHz, the total power consumption is about 12W, the optical-optical efficiency is 28%, and the optical-electrical efficiency is about 8.3%. Fig. 3 is a spectrum diagram of a MOPA fiber laser provided by an embodiment of the present invention, and referring to fig. 3, the center wavelength of the MOPA fiber laser is 1550.308 nm. Fig. 4 is a full temperature test result diagram of a MOPA fiber laser provided in an embodiment of the present invention. Referring to fig. 4, the MOPA fiber laser is placed in a high-low temperature circulating box to perform a full-temperature (-35-65 ℃) stability experiment for 16 hours, and the full-temperature stability is measured to be +/-7%.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
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