CN214625713U - Hybrid pumping fiber laser - Google Patents
Hybrid pumping fiber laser Download PDFInfo
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- CN214625713U CN214625713U CN202022966293.2U CN202022966293U CN214625713U CN 214625713 U CN214625713 U CN 214625713U CN 202022966293 U CN202022966293 U CN 202022966293U CN 214625713 U CN214625713 U CN 214625713U
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Abstract
The utility model relates to the technical field of high-power optical fiber lasers, and provides a hybrid pumping optical fiber laser, which comprises a signal source, a first hybrid pumping source, a first optical fiber coupler and a first gain optical fiber; the first optical fiber coupler is provided with ports corresponding to the number of the signal sources and the number of the first mixed pump sources, and the signal sources and the first mixed pump sources are connected with the first gain optical fiber through the first optical fiber coupler; the first mixed pump source corresponds to the absorption spectrum line of the first gain fiberIs doped with Yb3+An optical fiber. The utility model provides a mixed pumping fiber laser selects the pumping source according to the absorption spectral line of gain optic fibre doping particle, utilizes same fiber coupler to connect mixed pumping source, makes mixed pumping source get into gain optic fibre by fiber coupler coupling back, obtains long wavelength laser output through gain optic fibre's energy level conversion, improves and mixes Yb3+The utilization ratio of the optical fiber improves the optical-to-optical conversion efficiency and reduces the manufacturing difficulty of the high-power optical fiber laser.
Description
Technical Field
The utility model relates to a high power fiber laser technical field especially relates to a hybrid pumping fiber laser.
Background
Compared with other types of lasers, the fiber laser transmits high-power laser through 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 injected 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 selected, and a wider absorption range is kept.
Yb-doped fiber laser used in industrial fiber laser3+The optical fiber is used as a gain medium, and 915nm or 976nm pump light is injected into the gain medium to pass through Yb3+Is converted into 1080nm laser output. In the method, a single-wavelength pump source is used for manufacturing a laser and Yb is doped3+The absorption of the optical fiber to the pump light is concentrated near the same absorption peak, and Yb is doped3+The gain sections of the optical fibers are concentrated, the comprehensive utilization rate of the optical fibers is poor, the heat in the optical fibers is excessively concentrated, the gain is saturated, and the manufacturing difficulty of a high-power optical fiber laser is increasedIs large.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a mixed pumping fiber laser for solve above-mentioned problem, promote the comprehensive utilization ratio of laser instrument, promote optical fiber conversion efficiency, reduce the manufacturing degree of difficulty of high power fiber laser.
The embodiment of the utility model provides a mixed pumping fiber laser, include:
the device comprises a signal source, a first hybrid 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 source and the first mixed pump source in number, and the signal source and the first mixed pump source are both connected with the first gain optical fiber through the first optical fiber coupler; the first mixed pump source corresponds to an absorption spectral line of the first gain fiber; the first gain fiber is doped Yb3+An optical fiber.
According to the utility model provides a hybrid pumping fiber laser, hybrid pumping 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 hybrid pumping fiber laser, hybrid pumping 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 hybrid pumping fiber laser, hybrid pumping fiber laser still includes: a second fiber coupler and a second hybrid pump source;
the second optical fiber coupler is provided with ports corresponding to the signal source and the second mixed pump sources in number, and the second mixed pump sources are connected with the second gain optical fiber through the second optical fiber coupler.
According to the utility model provides a hybrid pumping fiber laser, hybrid pumping 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 hybrid pumping fiber laser, first hybrid pumping source with there is the pumping source that a plurality of groups wavelength is inequality in the second hybrid pumping source.
According to the utility model provides a hybrid pumping fiber laser, hybrid pumping 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 hybrid pumping fiber laser, hybrid pumping 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 the second mixed pump source corresponds to an absorption spectral line of the second gain fiber.
According to the utility model provides a hybrid pumping fiber laser, first gain fiber with second gain fiber is 915nm and 976nm hybrid pumping source, and wherein two kinds of pumping light total power ratio of 915nm and 976nm pumping source are 2: 1.
The utility model provides a mixed pumping fiber laser is equipped with signal source, first mixed pumping source, first fiber coupler and first gain optic fibre, and first fiber coupler is equipped with the port that corresponds signal source and first mixed pumping source quantity, all is connected signal source and first mixed pumping source through first fiber coupler and first gain optic fibre. Selecting a pump source according to the absorption spectrum line of the doped particles of the gain fiber, connecting the mixed pump sources by using the same fiber coupler, so that the mixed pump sources enter the gain fiber after being coupled by the fiber coupler, obtaining long-wavelength laser output through energy level conversion of the gain fiber, and improving Yb doping3+The utilization ratio of the optical fiber improves the optical-to-optical conversion efficiency and reduces the manufacturing difficulty of the high-power optical fiber laser.
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 hybrid pump fiber laser in a unidirectional pumping mode;
FIG. 2 is a schematic structural diagram of a hybrid pumped fiber laser in a bidirectional pumping mode;
FIG. 3 is a schematic diagram of a hybrid pump fiber laser for multiple gain fibers;
in the figure, 1, a first hybrid 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 hybrid 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 hybrid pump fiber laser, which includes: a signal source (not shown), a first hybrid pump source 1, a first fiber coupler 2 and a first gain fiber 4 form a single-cavity fiber laser. The first optical fiber coupler 2 is provided with ports corresponding to the number of the signal sources and the first hybrid pump sources 1, and the signal sources and the first hybrid pump sources 1 are connected with the first gain optical fiber 4 through the first optical fiber coupler 2. First gain optical fiber4 is Yb doped3+An optical fiber.
To increase the Yb doping3+The utilization rate of the optical fiber needs to select the first mixed pump source 1 corresponding to the wavelength interval, that is, the first mixed pump source 1 corresponds to the absorption spectrum line of the first gain optical fiber, in two or wavelength intervals corresponding to the higher absorption intensity of the first gain optical fiber 4, according to the absorption spectrum line of the doped particles of the first gain optical fiber 4. The first hybrid pump source 1 is coupled by a fiber coupler and enters the first gain fiber 4.
Wherein, the hybrid pumping fiber laser still includes: 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 hybrid pump fiber laser further includes: 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 the first hybrid pump source 1 is a pump source outputting dual wavelengths of 915nm and 976nm, or only two pump sources outputting wavelengths of 915nm and 976 nm. Assume that the number of first hybrid 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 hybrid pump source 1, and are used for receiving the pump light of the first hybrid pump source 1. The pump light generated by the first mixed 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, 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 mixed pumping fiber laser is equipped with signal source, first mixed pumping source, first fiber coupler and first gain optic fibre, and first fiber coupler is equipped with the port that corresponds signal source and first mixed pumping source quantity, all is connected signal source and first mixed pumping source through first fiber coupler and first gain optic fibre. Selection according to absorption lines of gain fiber doped particlesA pump source connected with the mixed pump source by the same optical fiber coupler to enter the gain fiber after being coupled by the optical fiber coupler, and obtain long wavelength laser output by energy level conversion of the gain fiber to improve Yb doping3+The utilization ratio of the optical fiber improves the optical-to-optical conversion efficiency and reduces the manufacturing difficulty of the high-power optical fiber laser.
The present invention is described below with reference to fig. 2, and provides a hybrid pump fiber laser, which includes: a signal source (not shown), a first hybrid pump source 1, a first fiber coupler 2, a first gain fiber 4, a second fiber coupler 6, and a second hybrid pump source 8. The first gain fiber 4 is doped Yb3+An optical fiber. The first optical fiber coupler 2 is provided with ports corresponding to the number of the signal sources and the first hybrid pump sources 1, and the signal sources and the first hybrid pump 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 hybrid pump sources 8, and the second hybrid pump 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 hybrid pumping fiber laser still 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 hybrid pump fiber laser further includes: 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 both the first hybrid pump source 1 and the second hybrid pump source 8 output pump sources with dual wavelengths of 915nm and 976nm, or only output pump sources with two wavelengths of 915nm and 976 nm. The total power ratio of the two pump lights of the pump source is 2: 1. The number corresponding to the first hybrid pump source 1 is N (N is a natural number greater than 2), the number corresponding to the second hybrid pump source 8 is M (M 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 a signal source for receiving signal light transmitted by the signal source. The other N paths of the first fiber coupler 2 are fused with the first hybrid pump source 1, and are used for receiving the pump light of the first hybrid pump source 1. The pump light generated by the first mixed 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-reflectivity grating 3. The second fiber coupler 6 has M +1 ports, N and M can be equal, and the difference between the two fiber couplers is that the parameters of the other two fibers except the N or M same fibers are different. 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 hybrid pump source 8, and are used for receiving the pump light of the second hybrid pump source 8. That is, the first hybrid pump source 1 injects pump light from the forward direction, and the second hybrid 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 mixed pumping fiber laser is equipped with signal source, first mixed pumping source, first fiber coupler and first gain optic fibre, and first fiber coupler is equipped with the port that corresponds signal source and first mixed pumping source quantity, all is connected signal source and first mixed pumping source through first fiber coupler and first gain optic fibre. Selecting a pump source according to the absorption spectrum line of the doped particles of the gain fiber, connecting the mixed pump sources by using the same fiber coupler, so that the mixed pump sources enter the gain fiber after being coupled by the fiber coupler, obtaining long-wavelength laser output through energy level conversion of the gain fiber, and improving Yb doping3+The utilization ratio of the optical fiber improves the optical-to-optical conversion efficiency and reduces the manufacturing difficulty of the high-power optical fiber laser.
Furthermore, difference and above-mentioned embodiment, the utility model provides a mixed pumping fiber laser adopts two-way pumping mode, 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 hybrid pump fiber laser, which includes: a signal source (not shown), a first hybrid pump source 1, a first fiber coupler 2, a first gain fiber 4, a second gain fiber 7, a second fiber coupler 6 and a second hybrid pump source 8, which form a main oscillation power amplifier structure line cavity fiber laser. The first gain fiber 4 and the second gain fiber 7 are both doped with Yb3+An optical fiber. The first optical fiber coupler 2 is provided with ports corresponding to the number of the signal sources and the first hybrid pump sources 1, and the signal sources and the first hybrid pump 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 signal sources and the second hybrid pump sources 8, and the second hybrid pump sources 8 are connected with the second gain optical fiber 7 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; the second hybrid pump source 8 corresponds to the absorption line of the second gain fiber 7.
In this embodiment, the hybrid 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 hybrid pump fiber laser further includes: 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 both the first hybrid pump source 1 and the second hybrid pump source 8 output pump sources with dual wavelengths of 915nm and 976nm, or only output pump sources with two wavelengths of 915nm and 976 nm. The total power ratio of the two pump lights of the pump source is 2: 1. The number of the first hybrid 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 a signal source for receiving signal light transmitted by the signal source. The other N paths of the first fiber coupler 2 are fused with the first hybrid pump source 1, and are used for receiving the pump light of the first hybrid pump source 1. The pump light generated by the first mixed 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 hybrid pump source 8, and are used for receiving the pump light of the second hybrid pump source 8. That is, the first hybrid pump source 1 injects pump light from the forward direction, and the second hybrid 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.
To sum up, the utility model provides a hybrid pumping fiber laser based on 915nm and 976nm hybrid pumping mode's fiber laser mixes Y in the laser according to the laserb3+The absorption spectrum of the optical fiber, selecting two wavelength intervals with higher absorption intensity, selecting the pumping source corresponding to the wavelength intervals, and allowing the pumping source to enter the resonant cavity through the optical fiber coupler and pass through Yb3+The energy level conversion can obtain 1080nm laser output and improve Yb doping3+The utilization rate of the optical fiber improves the optical-to-optical conversion efficiency and reduces the manufacturing problem of the high-power optical fiber laser.
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 (4)
1. A hybrid pumped fiber laser, comprising:
the optical fiber grating;
the first optical fiber coupler is provided with ports corresponding to the signal source and the first mixed pump source in number, and the signal source and the first mixed pump source are both connected with the first gain optical fiber through the first optical fiber coupler; the first mixed pump source corresponds to an absorption spectral line of the first gain fiber; the second mixed pump source corresponds to an absorption spectral line of the second gain fiber; the first gain fiber is doped Yb3+An optical fiber; the second optical fiber coupler is provided with ports corresponding to the signal source and the second mixed pump sources in number, and the second mixed pump sources are connected with the second gain optical fiber through the second optical fiber coupler; 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 between the first gain optical fiber and the second optical fiber coupler; the second gain fiber is connected between the low-reflection grating and the second fiber coupler.
2. The hybrid pumped fiber laser of claim 1, wherein there are sets of pump sources of the first hybrid pump source and the second hybrid pump source that differ in wavelength.
3. The hybrid pump fiber laser of claim 1, further comprising: an output optical cable; the output optical cable is connected with the output end of the second optical fiber coupler.
4. The hybrid pumped fiber laser of claim 1, wherein the first gain fiber and the second gain fiber are each a 915nm and 976nm hybrid pump source, wherein the total power ratio of the 915nm and 976nm pump sources is 2: 1.
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| CN202022966293.2U CN214625713U (en) | 2020-12-10 | 2020-12-10 | Hybrid pumping fiber laser |
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