CN214100219U - Multi-wavelength pumping fiber laser - Google Patents
Multi-wavelength pumping fiber laser Download PDFInfo
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- CN214100219U CN214100219U CN202022969967.4U CN202022969967U CN214100219U CN 214100219 U CN214100219 U CN 214100219U CN 202022969967 U CN202022969967 U CN 202022969967U CN 214100219 U CN214100219 U CN 214100219U
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Abstract
The utility model relates to a high power fiber laser technical field provides a multi-wavelength pump fiber laser, and this multi-wavelength pump fiber laser includes: the device comprises a signal source, a multi-wavelength first pump source, a first optical fiber coupler and a first gain optical fiber; the first optical fiber coupler is provided with ports corresponding to the signal sources and the first pumping sources in number, and the signal sources and the first pumping sources are connected with the first gain optical fiber through the first optical fiber coupler. The utility model provides a multi-wavelength pumping fiber laser selects the pumping source according to the absorption spectral line of gain fiber doping particle, utilizes same fiber coupler to connect the multi-wavelength pumping source, makes the multi-wavelength pumping source get into gain fiber after by the fiber coupler coupling, obtains long wavelength laser output through the energy level conversion of gain fiber, improves the utilization ratio of gain fiber, promotes light-to-light conversion efficiency, reduces the manufacturing degree of difficulty of high power fiber laser.
Description
Technical Field
The utility model relates to a high power fiber laser technical field especially relates to a multi-wavelength pumping fiber laser.
Background
Compared with other types of lasers, the fiber laser transmits high-power laser by using the optical fiber, and has the advantages of high conversion efficiency, small size, good beam quality and the like. The optical fiber laser uses an optical fiber doped with rare earth elements as a gain medium, and short-wavelength pump light is injected into the gain medium and converted into long-wavelength laser light for output through energy level transition of the rare earth elements. The selection of the injection pumping wavelength is related to the absorption spectrum line of the doping element, the pumping wavelength corresponding to high absorption intensity in the absorption spectrum line is usually selected, and a wider absorption range is reserved to establish the wavelength standard of the pumping source.
In the manufacturing process of the laser, a single wavelength is usually selected as a laser pumping source, pumping light is injected into the gain fiber, and long-wavelength laser light is generated through energy level transition of a gain medium in the gain fiber. The method enables the absorption of the pumping light by the gain medium to be concentrated near the same absorption peak, the gain section of the gain fiber is relatively concentrated, the comprehensive utilization rate of the laser fiber is poor, the heat in the fiber is excessively concentrated, the gain is saturated, and the manufacturing difficulty of the high-power fiber laser is increased.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a multi-wavelength pumping fiber laser for solve above-mentioned problem, promote the comprehensive utilization ratio of laser, promote light-to-light conversion efficiency, reduce the manufacturing degree of difficulty of high power fiber laser.
The embodiment of the utility model provides a multi-wavelength pumping fiber laser, include:
the device comprises a signal source, a multi-wavelength first pump source, a first optical fiber coupler and a first gain optical fiber;
the first optical fiber coupler is provided with ports corresponding to the signal sources and the first pumping sources in number, and the signal sources and the first pumping sources are connected with the first gain optical fiber through the first optical fiber coupler; and each first pumping source corresponds to an absorption spectral line of the first gain fiber.
According to the utility model provides a multi-wavelength pump fiber laser, multi-wavelength pump fiber laser still includes: high-reflection gratings and low-reflection gratings;
the high-reflection grating is connected between the first optical fiber coupler and the first gain optical fiber, and the low-reflection grating is connected with the output end of the first gain optical fiber.
According to the utility model provides a multi-wavelength pump fiber laser, multi-wavelength pump fiber laser still includes: an output optical cable; the output optical cable is connected with the low reflecting grating.
According to the utility model provides a multi-wavelength pump fiber laser, multi-wavelength pump fiber laser still includes: the second optical fiber coupler and the multi-wavelength second pump source;
the second optical fiber coupler is provided with ports corresponding to the signal sources and the number of the second pumping sources, and the second pumping sources are connected with the first gain optical fiber through the second optical fiber coupler.
According to the utility model provides a multi-wavelength pump fiber laser, multi-wavelength pump fiber laser still includes: high-reflection gratings and low-reflection gratings;
the high reflective grating is connected between the first optical fiber coupler and the first gain optical fiber, and the low reflective grating is connected between the first gain optical fiber and the second optical fiber coupler.
According to the utility model provides a multi-wavelength pump fiber laser, each first pump source and each there are the different pump source of a plurality of groups wavelength in the second pump source.
According to the utility model provides a multi-wavelength pump fiber laser, multi-wavelength pump fiber laser still includes: an output optical cable; the output optical cable is connected with the output end of the second optical fiber coupler.
According to the utility model provides a multi-wavelength pump fiber laser, multi-wavelength pump fiber laser still includes: a second gain fiber;
the second gain fiber is connected between the low-reflection grating and the second fiber coupler; and each second pumping source corresponds to an absorption spectral line of the second gain fiber.
According to the utility model provides a multi-wavelength pumping fiber laser, first gain optic fibre with second gain optic fibre is the gain optic fibre of tombarthite doping.
According to the utility model provides a multi-wavelength pumping fiber laser, first gain optic fibre with the wavelength absorptivity of second gain optic fibre is different.
The utility model provides a multi-wavelength pump fiber laser is equipped with signal source, the first pump source of multi-wavelength, first fiber coupler and first gain fiber, and first fiber coupler is equipped with the port that corresponds signal source and first pump source quantity, all is connected signal source and each first pump source through first fiber coupler and first gain fiber. The pumping sources are selected according to the absorption spectral lines of the gain optical fiber doped particles, the same optical fiber coupler is used for connecting the multiple pumping sources, the multiple wavelength pumping sources are coupled by the optical fiber coupler and then enter the gain optical fiber, long wavelength laser output is obtained through energy level conversion of the gain optical fiber, the utilization rate of the gain optical fiber is improved, the optical fiber conversion efficiency is improved, and the manufacturing difficulty of a high-power optical fiber laser is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a multi-wavelength pumped fiber laser in a unidirectional pumping manner;
FIG. 2 is a schematic structural diagram of a multi-wavelength pumped fiber laser in a bi-directional pumping mode;
FIG. 3 is a schematic diagram of a multi-wavelength pumped fiber laser for a multi-gain fiber;
in the figure, 1, a first pump source; 2. a first fiber coupler; 3. high-reflection grating; 4. a first gain fiber; 5. a low-reflection grating; 6. a second fiber coupler; 7. a second gain fiber; 8. a second pump source.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The present invention is described below with reference to fig. 1, and provides a multi-wavelength pump fiber laser, which includes: a signal source (not shown), a multi-wavelength first pump source 1, a first optical fiber coupler 2 and a first gain optical fiber 4 form a single-cavity optical fiber laser. The first optical fiber coupler 2 is provided with ports corresponding to the number of the signal sources and the first pumping sources 1, and the signal sources and the first pumping sources 1 are connected with the first gain optical fiber 4 through the first optical fiber coupler 2.
In order to improve the utilization rate of the gain fiber, the first pump source 1 corresponding to the wavelength interval is selected according to the absorption spectrum line of the doped particles of the first gain fiber 4 in two or more wavelength intervals corresponding to the higher absorption intensity of the first gain fiber 4, that is, each first pump source 1 corresponds to the absorption spectrum line of the first gain fiber. The multi-wavelength first pump source 1 is coupled by the optical fiber coupler and enters the first gain optical fiber 4.
Wherein, the multi-wavelength pumping fiber laser further comprises: a high reflection grating 3 and a low reflection grating 5. The high reflecting grating 3 is connected between the first optical fiber coupler 2 and the first gain optical fiber 4, and the low reflecting grating 5 is connected with the output end of the first gain optical fiber 4. In addition, the multi-wavelength pumped fiber laser further comprises: an output optical cable; the output optical cable is connected with the low reflecting grating 5.
In this embodiment, a unidirectional pumping manner is adopted, and it is assumed that the number of the first pump sources 1 is N (N is a natural number greater than 2). The first optical fiber coupler 2 is provided with N +1 ports, and one of the paths of the first optical fiber coupler 2 is fused with the signal source for receiving the signal light transmitted by the signal source. The other N paths of the first fiber coupler 2 are fused with the first pump source 1, and are used for receiving the pump light of the first pump source 1. The pumping light generated by the first pumping source 1 and the signal light emitted by the signal source enter the first optical fiber coupler 2, the laser generated by the first optical fiber coupler 2 enters the first gain optical fiber 4 through the high-reflection grating 3, the stimulated radiation completes the energy conversion, and the generated laser finally enters the output optical cable through the low-reflection grating 5 for output.
The utility model provides a multi-wavelength pump fiber laser is equipped with signal source, the first pump source of multi-wavelength, first fiber coupler and first gain fiber, and first fiber coupler is equipped with the port that corresponds signal source and first pump source quantity, all is connected signal source and each first pump source through first fiber coupler and first gain fiber. The pumping sources are selected according to the absorption spectral lines of the gain optical fiber doped particles, the same optical fiber coupler is used for connecting the multiple pumping sources, the multiple wavelength pumping sources are coupled by the optical fiber coupler and then enter the gain optical fiber, long wavelength laser output is obtained through energy level conversion of the gain optical fiber, the utilization rate of the gain optical fiber is improved, the optical fiber conversion efficiency is improved, and the manufacturing difficulty of a high-power optical fiber laser is reduced.
The present invention is described below with reference to fig. 2, and provides a multi-wavelength pump fiber laser, which includes: a signal source (not shown), a multi-wavelength first pump source 1, a first fiber coupler 2, a first gain fiber 4, a second fiber coupler 6, and a multi-wavelength second pump source 8. The first optical fiber coupler 2 is provided with ports corresponding to the number of the signal sources and the first pumping sources 1, and the signal sources and the first pumping sources 1 are connected with the first gain optical fiber 4 through the first optical fiber coupler 2. The second optical fiber coupler 6 is provided with ports corresponding to the number of the signal sources and the second pumping sources 8, and the second pumping sources 8 are connected with the first gain optical fiber 4 through the second optical fiber coupler 6.
The corresponding ports in the first optical fiber coupler 2 and the second optical fiber coupler 6 are equal, and meanwhile, the port of the signal source corresponding to the first optical fiber coupler 2 is different from the port of the signal source corresponding to the second optical fiber coupler 6 in port parameter.
Wherein, the multi-wavelength pumping fiber laser further comprises: a high reflection grating 3 and a low reflection grating 5. The high reflection grating 3 is connected between the first fiber coupler 2 and the first gain fiber 4, and the low reflection grating 5 is connected between the first gain fiber 4 and the second fiber coupler 6. The multi-wavelength pump fiber laser further comprises: an output optical cable; the output optical cable is connected with the output end of the second optical fiber coupler 6.
In this embodiment, a bidirectional pumping manner is adopted, and it is assumed that there are several groups of pumping sources with different wavelengths in each of the first pumping source 1 and the second pumping source 8. The number of the first pump sources 1 is N (N is a natural number greater than 2), the number of the second pump sources 8 is M (M is a natural number greater than 2), and the number of the first pump sources is X for the wavelength λ 1, Y for the wavelength λ 2, and Z for the wavelength λ 3, where X + Y + Z is not less than N or M, and λ 1 ≠ λ 2 ≠ λ 3. The first optical fiber coupler 2 is provided with N +1 ports, and one of the paths of the first optical fiber coupler 2 is fused with the signal source for receiving the signal light transmitted by the signal source. The other N paths of the first fiber coupler 2 are fused with the first pump source 1, and are used for receiving the pump light of the first pump source 1. The pump light generated by the first pump source 1 and the signal light emitted by the signal source enter the first optical fiber coupler 2, and the laser light generated by the first optical fiber coupler 2 enters the first gain optical fiber 4 through the high-reflection grating 3. The second optical fiber coupler 6 is provided with M +1 ports, and one path of the second optical fiber coupler 6 is welded with the high reflection grating 3 and is used for signal light transmitted by the high reflection grating 3. The other M paths of the second fiber coupler 6 are fused with the second pump source 8 for receiving the pump light of the second pump source 8. That is, the first pump source 1 injects pump light from the forward direction, and the second pump source 8 injects pump light from the reverse direction, so as to form a bidirectional pumping mode. Two beams of pump light are stimulated and radiated in the first gain fiber 4 to complete energy conversion, so that signal light input from the outside is amplified. The generated laser finally enters the output optical cable to be output through the low-reflection grating 5 and the second optical fiber coupler 6.
The utility model provides a multi-wavelength pump fiber laser is equipped with signal source, the first pump source of multi-wavelength, first fiber coupler and first gain fiber, and first fiber coupler is equipped with the port that corresponds signal source and first pump source quantity, all is connected signal source and each first pump source through first fiber coupler and first gain fiber. The pumping sources are selected according to the absorption spectral lines of the gain optical fiber doped particles, the same optical fiber coupler is used for connecting the multiple pumping sources, the multiple wavelength pumping sources are coupled by the optical fiber coupler and then enter the gain optical fiber, long wavelength laser output is obtained through energy level conversion of the gain optical fiber, the utilization rate of the gain optical fiber is improved, the optical fiber conversion efficiency is improved, and the manufacturing difficulty of a high-power optical fiber laser is reduced.
Furthermore, difference and above-mentioned embodiment, the utility model provides a two-way pumping mode is adopted to the multi-wavelength pump fiber laser, makes pump light evenly distributed in optic fibre, has increased output.
The present invention is described below with reference to fig. 3, and provides a multi-wavelength pump fiber laser, which includes: a signal source (not shown), a multi-wavelength first pump source 1, a first optical fiber coupler 2, a first gain optical fiber 4, a second gain optical fiber 7, a second optical fiber coupler 6 and a multi-wavelength second pump source 8, which form a main oscillation power amplifier structure line cavity optical fiber laser. The first optical fiber coupler 2 is provided with ports corresponding to the number of the signal sources and the first pumping sources 1, and the signal sources and the first pumping sources 1 are connected with the first gain optical fiber 4 through the first optical fiber coupler 2. The second optical fiber coupler 6 is provided with ports corresponding to the number of the signal sources and the second pumping sources 8, and the second pumping sources 8 are connected with the first gain optical fiber 4 through the second optical fiber coupler 6.
The second gain fiber 7 is connected between the low-reflection grating 5 and the second fiber coupler 6; each second pump source 8 corresponds to an absorption line of the second gain fiber 7. The first gain fiber 4 and the second gain fiber 7 are both rare-earth doped gain fibers. The first gain fiber 4 and the second gain fiber 7 have different wavelength absorptance.
In this embodiment, the multi-wavelength pump fiber laser further includes: a high reflection grating 3 and a low reflection grating 5. The high reflection grating 3 is connected between the first fiber coupler 2 and the first gain fiber 4, and the low reflection grating 5 is connected between the first gain fiber 4 and the second fiber coupler 6. The multi-wavelength pump fiber laser further comprises: an output optical cable; the output optical cable is connected with the output end of the second optical fiber coupler 6.
In this embodiment, a bidirectional pumping manner is adopted, the number of the first pumping sources 1 is N (N is a natural number greater than 2), then the first optical fiber coupler 2 is provided with N +1 ports, and one of the paths of the first optical fiber coupler 2 is welded to the signal source for receiving the signal light transmitted by the signal source. The other N paths of the first fiber coupler 2 are fused with the first pump source 1, and are used for receiving the pump light of the first pump source 1. The pump light generated by the first pump source 1 and the signal light emitted by the signal source enter the first optical fiber coupler 2, the laser generated by the first optical fiber coupler 2 enters the first gain optical fiber 4 through the high-reflection grating 3, and then enters the second gain optical fiber 7 through the low-reflection grating 5. Meanwhile, the second optical fiber coupler 6 is provided with M +1 ports, and one path of the second optical fiber coupler 6 is welded with the high-reflection grating 3 and is used for signal light transmitted by the high-reflection grating 3. The other M paths of the second fiber coupler 6 are fused with the second pump source 8 for receiving the pump light of the second pump source 8. That is, the first pump source 1 injects pump light from the forward direction, and the second pump source 8 injects pump light from the reverse direction, so as to form a bidirectional pumping mode. Two beams of pump light are stimulated and radiated in the first gain fiber 4 and the second gain fiber 7 to complete energy conversion, so that signal light input from the outside is amplified. The generated laser light finally enters the output optical cable through the second optical fiber coupler 6.
The utility model provides a multi-wavelength pump fiber laser is equipped with signal source, the first pump source of multi-wavelength, first fiber coupler and first gain fiber, and first fiber coupler is equipped with the port that corresponds signal source and first pump source quantity, all is connected signal source and each first pump source through first fiber coupler and first gain fiber. The pumping sources are selected according to the absorption spectral lines of the gain optical fiber doped particles, the same optical fiber coupler is used for connecting the multiple pumping sources, the multiple wavelength pumping sources are coupled by the optical fiber coupler and then enter the gain optical fiber, long wavelength laser output is obtained through energy level conversion of the gain optical fiber, the utilization rate of the gain optical fiber is improved, the optical fiber conversion efficiency is improved, and the manufacturing difficulty of a high-power optical fiber laser is reduced.
In addition, in the embodiment, a mode of a plurality of gain fibers is adopted, and the situation that the absorption efficiencies of a plurality of wavelengths of a pumping source in the gain fibers are inconsistent is realized, so that compared with the situation that the absorption efficiency of a pumping mode with a single wavelength is high, the effect of average absorption efficiency is achieved, the temperature of a fiber core is controlled, and the threshold value of mode instability is increased; compared with the condition of low absorption of a single pumping mode, the method has the advantages that the length of the optical fiber is reduced, the power level is improved, and the threshold value of the nonlinear effect is increased.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A multi-wavelength pumped fiber laser, comprising:
the device comprises a signal source, a multi-wavelength first pump source, a first optical fiber coupler and a first gain optical fiber;
the first optical fiber coupler is provided with ports corresponding to the signal sources and the first pumping sources in number, and the signal sources and the first pumping sources are connected with the first gain optical fiber through the first optical fiber coupler; and each first pumping source corresponds to an absorption spectral line of the first gain fiber.
2. The multi-wavelength pump fiber laser of claim 1, further comprising: high-reflection gratings and low-reflection gratings;
the high-reflection grating is connected between the first optical fiber coupler and the first gain optical fiber, and the low-reflection grating is connected with the output end of the first gain optical fiber.
3. The multi-wavelength pump fiber laser of claim 2, further comprising: an output optical cable; the output optical cable is connected with the low reflecting grating.
4. The multi-wavelength pump fiber laser of claim 1, further comprising: the second optical fiber coupler and the multi-wavelength second pump source;
the second optical fiber coupler is provided with ports corresponding to the signal sources and the number of the second pumping sources, and the second pumping sources are connected with the first gain optical fiber through the second optical fiber coupler.
5. The multi-wavelength pump fiber laser of claim 4, further comprising: high-reflection gratings and low-reflection gratings;
the high reflective grating is connected between the first optical fiber coupler and the first gain optical fiber, and the low reflective grating is connected between the first gain optical fiber and the second optical fiber coupler.
6. The multi-wavelength pumped fiber laser of claim 4, wherein there are sets of pump sources of different wavelengths in each of the first pump source and each of the second pump source.
7. The multi-wavelength pump fiber laser of claim 4, further comprising: an output optical cable; the output optical cable is connected with the output end of the second optical fiber coupler.
8. The multi-wavelength pump fiber laser of claim 5, further comprising: a second gain fiber;
the second gain fiber is connected between the low-reflection grating and the second fiber coupler; and each second pumping source corresponds to an absorption spectral line of the second gain fiber.
9. The multi-wavelength pumped fiber laser of claim 8, wherein the first gain fiber and the second gain fiber are both rare-earth doped gain fibers.
10. The multi-wavelength pumped fiber laser of claim 8, wherein the first gain fiber and the second gain fiber have different wavelength absorptances.
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| CN202022969967.4U CN214100219U (en) | 2020-12-10 | 2020-12-10 | Multi-wavelength pumping fiber laser |
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| CN202022969967.4U CN214100219U (en) | 2020-12-10 | 2020-12-10 | Multi-wavelength pumping fiber laser |
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