CN212968476U - 1.55-micrometer single-mode Er-Yb co-doped all-fiber laser - Google Patents
1.55-micrometer single-mode Er-Yb co-doped all-fiber laser Download PDFInfo
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- CN212968476U CN212968476U CN202021322383.1U CN202021322383U CN212968476U CN 212968476 U CN212968476 U CN 212968476U CN 202021322383 U CN202021322383 U CN 202021322383U CN 212968476 U CN212968476 U CN 212968476U
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Abstract
The utility model provides a 1.55 micron single mode Er-Yb codoped type all fiber laser, include: the device comprises a first pump laser, a second pump laser, a beam combiner, a first fiber Bragg grating, a second fiber Bragg grating, an Er-Yb co-doped gain fiber, a first single-mode fiber, a second single-mode fiber and a first coupling output mirror; the Er-Yb co-doped gain fiber is positioned in an optical resonant cavity formed by the first fiber Bragg grating and the second fiber Bragg grating; the first single-mode fiber and the second single-mode fiber are respectively welded at two ends of the Er-Yb co-doped gain fiber. The laser has the advantages that the whole structure is compact, the first single mode fiber and the second single mode fiber play a role in filtering high-order modes, the single mode state of the resonant cavity is kept, a laser beam output by the laser has high quality and stability, the conversion efficiency is high, the cost is low, the operation is easy, the laser is suitable for obtaining high-power single-mode 1.55 mu m laser output, and the commercialization is easy to realize.
Description
Technical Field
The utility model belongs to the technical field of laser, what especially relate to is a 1.55 micron single mode Er-Yb codoped type all fiber laser.
Background
The fiber laser has the advantages of good beam quality, light weight, low maintenance, high processing precision, long service life, energy conservation, intellectualization, automation, good flexibility and the like, is easy to realize commercialization and the like, and becomes a hotspot of research in many fields. Among them, 1.55 μm band laser is widely used in the fields of optical fiber communication, laser radar, satellite remote sensing and precision measurement, etc. due to its "eye safety" and low loss in optical fiber and atmosphere. With the emergence of 970nm InGaAs laser diodes and double-clad Er-Yb co-doped gain fibers and the continuous improvement of the process thereof, the output power of the obtained 1.55-micrometer-waveband laser is higher and higher, and the high-power 1.55-micrometer-waveband fiber laser is widely applied to the aspects of biomedical treatment, material processing, gas detection and the like and becomes a hot spot field for research of researchers.
At present, there are three main schemes for realizing a 1.55 μm high-power fiber laser: the first is a Raman fiber laser, which obtains 1.55 μm wave band output by high power cascade multiple Raman frequency shifts, and the mode is complex in system and high in cost; the second is an erbium-doped fiber laser, which adopts a 976nm semiconductor pump source and usually adopts an erbium-doped fiber with an ultra-large core diameter to realize high-power laser output in a 1.55 mu m wave band, but the quality of a laser beam is poor due to the unavoidable ultra-large core diameter, and Er is singly doped3+The doping concentration is limited due to the concentration quenching effect, so that the pumping conversion efficiency is low, and the higher power output is limited; the third is erbium-ytterbium co-doped fiber laser, which adopts cladding pumped Er-Yb co-doped fiber and can be in the region of-1.55 μmThe laser with high power output is produced in the region, but the existing erbium-ytterbium co-doped fiber laser is realized by adopting a large-mode gain fiber, and the large-mode gain fiber comprises dozens or even hundreds of modes, so that the quality of an output laser beam is greatly reduced. In addition, many high power lasers include several free-space optical elements, increasing the complexity of the system, thereby increasing maintenance costs.
Therefore, the prior art is subject to further improvement.
SUMMERY OF THE UTILITY MODEL
In view of the defects in the prior art, the utility model aims to provide a 1.55 micron single-mode Er-Yb co-doped all-fiber laser, which overcomes the defects of complex Raman fiber laser system and high cost in the prior 1.55 micron high-power fiber laser; the laser beam quality of the erbium-doped fiber laser is poor, and the pumping conversion efficiency is low; the erbium ytterbium co-doped fiber laser adopts a large-mode-area gain fiber, and has the defects of poor quality of output laser beams, complex system and high maintenance cost.
The utility model discloses an embodiment is a 1.55 micron single mode Er-Yb codoped type full fiber laser, wherein, including first pump laser, second pump laser, beam combiner, first fiber Bragg grating, second fiber Bragg grating, Er-Yb codoped type gain fiber, first single mode fiber, second single mode fiber and first coupling output mirror; wherein the content of the first and second substances,
the first pump laser is used for generating first pump light;
the second pump laser is used for generating second pump light;
the first fiber Bragg grating and the second fiber Bragg grating form an optical resonant cavity, and the Er-Yb co-doped gain fiber is positioned in the optical resonant cavity;
the first single-mode fiber and the second single-mode fiber are respectively welded to two ends of the Er-Yb co-doped gain fiber and used for keeping a single-mode state of the optical resonant cavity;
and after the first pump light and the second pump light are combined by the beam combiner, the first pump light and the second pump light are coupled and enter the Er-Yb co-doped gain fiber, and are oscillated in the optical resonant cavity to form 1.55 mu m laser which is output by the first coupling output mirror.
The 1.55-micrometer single-mode Er-Yb co-doped all-fiber laser is characterized in that the wavelengths of the first pump light and the second pump light output by the first pump laser and the second pump laser are 976nm +/-2 nm.
The 1.55-micrometer single-mode Er-Yb co-doped all-fiber laser is characterized in that the working wavelength of the beam combiner is 976nm +/-0.5 nm and 1545nm +/-0.5 nm; the damage threshold of the beam combiner is more than 30W.
The 1.55-micrometer single-mode Er-Yb co-doped all-fiber laser is characterized in that the bandwidth of the first fiber Bragg grating is 0.3-0.5 nm; the reflectivity of the first fiber Bragg grating to 1545nm +/-0.5 nm laser is more than 99.5%.
The 1.55-micrometer single-mode Er-Yb co-doped all-fiber laser is characterized in that the bandwidth of the second fiber Bragg grating is 0.5-0.7 nm; the laser transmittance of the second fiber Bragg grating to 1545nm +/-0.5 nm is more than 10%.
The 1.55-micrometer single-mode Er-Yb co-doped all-fiber laser is characterized in that the Er-Yb co-doped gain fiber is a double-clad multi-mode fiber; the length of the Er-Yb co-doped gain fiber is 1.5 m-2 m.
The 1.55-micrometer single-mode Er-Yb co-doped all-fiber laser further comprises a third single-mode fiber; the third single-mode fiber is arranged between the second fiber Bragg grating and the first coupling output mirror.
The 1.55-micrometer single-mode Er-Yb co-doped all-fiber laser further comprises a second coupling output mirror; the second coupling-out mirror is used for receiving and outputting the laser beam transmitted by the first fiber Bragg grating.
Advantageous effect, the utility model provides a 1.55 micron single mode Er-Yb mixes type full fiber laser altogether, constitute the optical resonator of 1.55 mu m laser through first fiber Bragg grating and second fiber Bragg grating, filter the high order mode at first single mode fiber and the second single mode fiber at Er-Yb mixes type gain fiber both ends altogether through the butt fusion in the oscillation process, keep resonant cavity single mode state, output laser quality is high and stable, conversion efficiency is high, low cost, easy operation, be fit for obtaining high power single mode 1.55 mu m laser output, easily realize commercialization.
Drawings
Fig. 1 is a schematic structural diagram of a 1.55 μm single-mode Er-Yb co-doped all-fiber laser provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The existing 1.55 μm high-power fiber laser mainly has three types: the first is a Raman fiber laser, which obtains 1.55 μm wave band output by high power cascade multiple Raman frequency shifts, and the mode is complex in system and high in cost; the second is an erbium-doped fiber laser, which usually adopts an erbium-doped fiber with an ultra-large core diameter to realize high-power laser output of a 1.55 mu m wave band, but the quality of a laser beam is poor due to the unavoidable ultra-large core diameter, and Er is singly doped3+The doping concentration is limited due to the concentration quenching effect, so that the pumping conversion efficiency is low, and the higher power output is limited; the third is erbium ytterbium co-doped fiber laser, which is realized by large-mode gain fiber, and the large-mode gain fiber comprises dozens or even hundreds of modes, thereby greatly reducing the quality of output laser beam. In addition, many high power lasers include several free-space optical elements, increasing the complexity of the system, thereby increasing maintenance costs. In order to solve the above problems, the present invention provides a 1.55 μm single mode Er-Yb co-doped all-fiber laser, as shown in fig. 1. The utility model discloses a full fiber laser includes: a first pump laser 11, a second pump laser 12, a beam combiner 13, a first fiber Bragg grating 14, a second fiber Bragg grating 15, an Er-Yb co-doped gain fiber 16, a first single-mode fiber 17,A second single mode fibre 18 and a first coupling-out mirror 19. Wherein, the first pump laser 11 is used for generating a first pump light; the second pump laser 12 is used for generating second pump light; the first fiber Bragg grating 14 and the second fiber Bragg grating 15 form an optical resonant cavity, and the Er-Yb co-doped gain fiber 16 is positioned in the optical resonant cavity; the first single-mode fiber 17 and the second single-mode fiber 18 are respectively fused at two ends of the Er-Yb co-doped gain fiber 16 and used for maintaining a single-mode state of the optical resonant cavity. In specific implementation, after the first pump light and the second pump light are combined by the beam combiner 13, the first pump light and the second pump light are coupled into the Er-Yb co-doped gain fiber 16, and then oscillate in an optical resonant cavity formed by the first fiber bragg grating 14 and the second fiber bragg grating 15, in the oscillation process, a high-order mode is filtered by the first single-mode fiber 17 and the second single-mode fiber 18, a single-mode state of the resonant cavity is maintained, and 1.55 μm laser is formed by oscillation and is output by the first coupling output mirror 19. The utility model discloses a full fiber laser overall structure is compact, filters the high order mould through Er-Yb mixes 16 both ends welded first single mode fiber 17 of type gain fiber and second single mode fiber 18 altogether, keeps resonant cavity single mode state, and the output laser high quality is high and stable, and conversion efficiency is high, and is with low costs, easy operation, is fit for obtaining high power single mode 1.55 mu m laser output, easily realizes commercialization.
In specific implementation, the wavelengths of the first pump light and the second pump light output by the first pump laser 11 and the second pump laser 12 are 976nm ± 2 nm. The first pumping light and the second pumping light are coupled by the beam combiner 13 and enter the Er-Yb co-doped gain fiber 16, and then Yb3+Absorbing pump light from ground state2F7/2Transition to metastable state2F5/2Then through Yb3+Act of2F5/2Yb of energy level3+With the ground state4I15/2Er of energy level3+Cross-relaxation occurs to thereby change Yb3+The energy on is transferred to Er3+. Er with energy3+Transition from ground state to4I11/2Energy level, then Er3+Is/are as follows4I11/2With energy level jumping down to other forms4I13/2Energy level then of4I13/2Energy level returning to ground state4I15/2Emitting laser light of 1.55 μm band and Yb3+Returning to the excited state due to the releasing ability. In Er-Yb co-doping system, Er3+Excited radiation is generated to generate laser light, Yb3+Can not generate stimulated radiation and plays a role in energy transfer, Yb3+The absorption of pump light is far greater than Er3+Therefore, the energy utilization rate of the laser is greatly improved, the integral oblique efficiency of the laser reaches 31.2%, and the output power is 19.2W.
Further, the working wavelength of the beam combiner 13 is 976nm ± 0.5nm and 1545nm ± 0.5 nm; the damage threshold of the combiner 13 is 30W or more. The high-power beam combiner 13 can effectively improve the maximum pump accommodation power, the energy conversion efficiency and the laser damage threshold in the single gain fiber.
In a specific implementation, the first fiber bragg grating 14 and the second fiber bragg grating 15 form an optical resonant cavity of a 1.55 μm laser, the first fiber bragg grating 14 has a high reflectivity, and the second fiber bragg grating 15 has a low reflectivity. Specifically, the bandwidth of the first fiber bragg grating 14 is 0.3nm to 0.5 nm; the reflectivity of the first fiber Bragg grating 14 to 1545nm +/-0.5 nm laser is more than 99.5%; the bandwidth of the second fiber Bragg grating 15 is 0.5 nm-0.7 nm; the transmittance of the second fiber Bragg grating 15 to 1545nm +/-0.5 nm laser is more than 10%; the first fiber bragg grating 14 and the second fiber bragg grating 15 are both high-power optical fiber devices, and the damage threshold of the first fiber bragg grating 14 and the damage threshold of the second fiber bragg grating 15 are 20W or more. The first pump light and the second pump light are coupled into an Er-Yb co-doped gain fiber 16, and after 1.55 mu m laser is formed in an optical resonant cavity by oscillation, the reflectivity of the first fiber Bragg grating 14 to 1545nm +/-0.5 nm laser is greater than 99.5%, the transmissivity of the second fiber Bragg grating 15 to 1545nm +/-0.5 nm laser is greater than 10%, and the 1.55 mu m laser formed by oscillation is output by a first coupling output mirror 19 after being transmitted by the second fiber Bragg grating 15. The utility model discloses an optical fiber Bragg grating of high power can effectively improve single interior highest pumping of gain fiber and hold power, energy conversion efficiency and laser damage threshold value, compares in traditional singly mix Er gain fiber, has higher gain and the higher whole output of laser instrument.
In specific implementation, the Er-Yb co-doped gain fiber 16 in this embodiment is a double-clad multimode fiber, the length of the Er-Yb co-doped gain fiber 16 is 1.5m to 2m, and the adoption of the multimode Er-Yb co-doped double-clad gain fiber can effectively improve the maximum pump accommodation power, the energy conversion efficiency and the laser damage threshold in a single gain fiber
In specific implementation, the first single-mode fiber 17 and the second single-mode fiber 18 are standard 28 communication fibers, the lengths of the first single-mode fiber 17 and the second single-mode fiber 18 are 0.5m to 1m, and the first single-mode fiber 17 and the second single-mode fiber 18 play a role in filtering high-order modes during oscillation, so that a single-mode state of a resonant cavity is maintained, and laser single-mode output is realized.
In specific implementation, in order to output laser light in a single mode, the laser in this embodiment further includes a third single-mode fiber 20; the third single-mode fiber 20 is disposed between the second fiber bragg grating 15 and the first coupling output mirror 19, and is configured to filter a high-order mode in a laser beam output by the second fiber bragg grating 15, so that a laser beam finally output by the first coupling output mirror 19 has a higher single-mode degree.
In practical implementation, although the first fiber bragg grating 14 has high reflection to the laser light of 1545nm ± 0.5nm, a small amount of laser beam still transmits from the first fiber bragg grating 14, in this embodiment, a second coupling-out mirror 21 is further disposed adjacent to the first fiber bragg grating 14, and the second coupling-out mirror 21 is configured to receive and output the laser beam transmitted by the first fiber bragg grating 14.
Compared with the prior art, the embodiment of the utility model provides an advantage lies in:
1. the embodiment of the utility model provides an in adopt full optical fiber integration, laser instrument overall structure is compact, and output laser high quality is high and stable, and conversion efficiency is high, and is with low costs, easy operation, is fit for obtaining high power single mode 1.55 mu m laser output, easily realizes the commercialization simultaneously.
2. The embodiment of the utility model provides an in adopt double-clad multimode Er-Yb to mix type gain fiber and high power beam combiner and optic fibre Bragg grating altogether, can effectively improve single interior highest pumping of gain fiber and hold power, energy conversion efficiency and laser damage threshold value, compare in traditional singly mix Er gain fiber, have higher gain and the whole output of higher laser instrument.
3. The embodiment of the utility model provides an in adopt and to play when laser beam oscillation and filter high order mode effect at Er-Yb codoped type gain fiber both ends butt fusion single mode fiber, keep resonant cavity single mode state, the laser beam of laser instrument output has higher quality and stability.
The invention is further explained below by means of specific embodiments.
Example 1
A dual wavelength pumped erbium doped fluoride fiber laser, the fiber laser comprising:
as shown in fig. 1, a first pump laser 11, a second pump laser 12, a beam combiner 13, a first fiber bragg grating 14, a second fiber bragg grating 15, an Er-Yb co-doped gain fiber 16, a first single-mode fiber 17, a second single-mode fiber 18, a third single-mode fiber 20, a first coupling output mirror 19, and a second coupling output mirror 21.
The wavelengths of the first pump light and the second pump light output by the first pump laser 11 and the second pump laser 12 are 976nm and 975nm, respectively.
The beam combiner 13 is a high-power optical fiber beam combiner 13, the working wavelength of the high-power optical fiber beam combiner is 975.5nm and 1544.5nm, and the damage threshold is more than 30W;
the peak reflectivity of the first fiber Bragg grating 14 at 1545.5nm is 99.5%, and the bandwidth is 0.5 nm; the second fiber bragg grating 15 has a transmittance of 10% at a wavelength of 1544.6nm and a bandwidth of 0.7 nm.
The Er-Yb co-doped gain fiber 16 is a double-clad multimode fiber; the length of the Er-Yb co-doped gain fiber 16 is 2.0 m.
The first single-mode fiber 17, the second single-mode fiber 18, and the third single-mode fiber 20 are standard 28 communication single-mode fibers, and the lengths thereof are all 1 m.
The first pump light and the second pump light are coupled into an Er-Yb co-doped gain fiber 16 after being combined by a beam combiner 13, and Yb is obtained3+Absorbing pump light from ground state2F7/2Transition to metastable state2F5/2Then through Yb3+Act of2F5/2Yb of energy level3+With the ground state4I15/2Er of energy level3+Cross-relaxation occurs to thereby change Yb3+The energy on is transferred to Er3+. Er with energy3+Transition from ground state to4I11/2Energy level, then Er3+Is/are as follows4I11/2Energy level transitions down to other forms4I13/2Energy level then of4I13/2Energy level returning to ground state4I15/2Emitting light in the 1.55 μm band, and Yb3+Returning to the excited state due to the releasing ability. In Er-Yb co-doping system, Er3+Excited radiation is generated to generate laser light, Yb3+Can not generate stimulated radiation and plays a role in energy transfer, Yb3+The absorption of pump light is far greater than Er3+Therefore, the energy utilization rate of the laser is greatly improved, the integral oblique efficiency of the laser reaches 31.2%, and the output power is 19.2W.
Example 2
As shown in fig. 1, a first pump laser 11, a second pump laser 12, a beam combiner 13, a first fiber bragg grating 14, a second fiber bragg grating 15, an Er-Yb co-doped gain fiber 16, a first single-mode fiber 17, a second single-mode fiber 18, a third single-mode fiber 20, a first coupling output mirror 19, and a second coupling output mirror 21.
The wavelengths of the first pump light and the second pump light output by the first pump laser 11 and the second pump laser 12 are 976nm and 976nm, respectively.
The beam combiner 13 is a high-power optical fiber beam combiner 13, the working wavelength of the high-power optical fiber beam combiner is 975.5nm and 1544.5nm, and the damage threshold is more than 30W;
the peak reflectivity of the first fiber Bragg grating 14 at 1544.5nm is 99.8%, and the bandwidth is 0.3 nm; the second fiber bragg grating 15 has a transmittance of 10% at a wavelength of 1544.5nm and a bandwidth of 0.5 nm.
The Er-Yb co-doped gain fiber 16 is a double-clad multimode fiber; the length of the Er-Yb co-doped gain fiber 16 is 1.5 m.
The first single-mode fiber 17, the second single-mode fiber 18, and the third single-mode fiber 20 are standard 28 communication single-mode fibers, and the lengths thereof are all 0.5 m.
The first pump light and the second pump light are coupled into an Er-Yb co-doped gain fiber 16 after being combined by a beam combiner 13, and Yb is obtained3+Absorbing pump light from ground state2F7/2Transition to metastable state2F5/2Then through Yb3+Act of2F5/2Yb of energy level3+With the ground state4I15/2Er of energy level3+Cross-relaxation occurs to thereby change Yb3+The energy on is transferred to Er3+. Er with energy3+Transition from ground state to4I11/2Energy level, then Er3+Is/are as follows4I11/2Energy level transitions down to other forms4I13/2Energy level then of4I13/2Energy level returning to ground state4I15/2Emitting light in the 1.55 μm band, and Yb3+Returning to the excited state due to the releasing ability. In Er-Yb co-doping system, Er3+Excited radiation is generated to generate laser light, Yb3+Can not generate stimulated radiation and plays a role in energy transfer, Yb3+The absorption of pump light is far greater than Er3+The energy utilization rate of the laser is greatly improved, the integral oblique efficiency of the laser reaches 29 percent,the output power was 19.8W.
Example 3
As shown in fig. 1, a first pump laser 11, a second pump laser 12, a beam combiner 13, a first fiber bragg grating 14, a second fiber bragg grating 15, an Er-Yb co-doped gain fiber 16, a first single-mode fiber 17, a second single-mode fiber 18, a third single-mode fiber 20, a first coupling output mirror 19, and a second coupling output mirror 21.
The wavelengths of the first pump light and the second pump light output by the first pump laser 11 and the second pump laser 12 are 978nm and 977nm, respectively.
The beam combiner 13 is a high-power optical fiber beam combiner 13, the working wavelength of the high-power optical fiber beam combiner is 976.5nm and 1545.5nm, and the damage threshold is more than 30W;
the peak reflectivity of the first fiber Bragg grating 14 at 1545.5nm is 99.7%, and the bandwidth is 0.4 nm; the second fiber bragg grating 15 has a transmittance of 15% at a wavelength of 1545.5nm and a bandwidth of 0.6 nm.
The Er-Yb co-doped gain fiber 16 is a double-clad multimode fiber; the length of the Er-Yb co-doped gain fiber 16 is 1.8 m.
The first single-mode fiber 17, the second single-mode fiber 18, and the third single-mode fiber 20 are standard 28 communication single-mode fibers, and the lengths thereof are all 0.8 m.
The first pump light and the second pump light are coupled into an Er-Yb co-doped gain fiber 16 after being combined by a beam combiner 13, and Yb is obtained3+Absorbing pump light from ground state2F7/2Transition to metastable state2F5/2Then through Yb3+Act of2F5/2Yb of energy level3+With the ground state4I15/2Er of energy level3+Cross-relaxation occurs to thereby change Yb3+The energy on is transferred to Er3+. Er with energy3+Transition from ground state to4I11/2Energy level, then Er3+Is/are as follows4I11/2Energy level transitions down to other forms4I13/2Energy level then of4I13/2Energy level returnTo the ground state4I15/2Emitting light in the 1.55 μm band, and Yb3+Returning to the excited state due to the releasing ability. In Er-Yb co-doping system, Er3+Excited radiation is generated to generate laser light, Yb3+Can not generate stimulated radiation and plays a role in energy transfer, Yb3+The absorption of pump light is far greater than Er3+The energy utilization rate of the laser is greatly improved, the overall oblique efficiency of the laser reaches 32%, and the output power is 20W.
Example 4
As shown in fig. 1, a first pump laser 11, a second pump laser 12, a beam combiner 13, a first fiber bragg grating 14, a second fiber bragg grating 15, an Er-Yb co-doped gain fiber 16, a first single-mode fiber 17, a second single-mode fiber 18, a third single-mode fiber 20, a first coupling output mirror 19, and a second coupling output mirror 21.
The wavelengths of the first pump light and the second pump light output by the first pump laser 11 and the second pump laser 12 are 974nm and 975nm, respectively.
The beam combiner 13 is a high-power optical fiber beam combiner 13, the working wavelength of the high-power optical fiber beam combiner is 976.2nm and 1545.3nm, and the damage threshold is more than 30W;
the peak reflectivity of the first fiber Bragg grating 14 at 1545.3nm is 99.5%, and the bandwidth is 0.4 nm; the transmittance of the second fiber bragg grating 15 at a wavelength of 1545.4nm is 12%, and the bandwidth is 0.6 nm.
The Er-Yb co-doped gain fiber 16 is a double-clad multimode fiber; the length of the Er-Yb co-doped gain fiber 16 is 1.6 m.
The first single-mode fiber 17, the second single-mode fiber 18, and the third single-mode fiber 20 are standard 28 communication single-mode fibers, and the lengths thereof are all 0.9 m.
The first pump light and the second pump light are coupled into an Er-Yb co-doped gain fiber 16 after being combined by a beam combiner 13, and Yb is obtained3+Absorbing pump light from ground state2F7/2Transition to metastable state2F5/2Then through Yb3+Act of2F5/2Yb of energy level3+With the ground state4I15/2Er of energy level3+Cross-relaxation occurs to thereby change Yb3+The energy on is transferred to Er3+. Er with energy3+Transition from ground state to4I11/2Energy level, then Er3+Is/are as follows4I11/2Energy level transitions down to other forms4I13/2Energy level then of4I13/2Energy level returning to ground state4I15/2Emitting light in the 1.55 μm band, and Yb3+Returning to the excited state due to the releasing ability. In Er-Yb co-doping system, Er3+Excited radiation is generated to generate laser light, Yb3+Can not generate stimulated radiation and plays a role in energy transfer, Yb3+The absorption of pump light is far greater than Er3+Therefore, the energy utilization rate of the laser is greatly improved, the overall oblique efficiency of the laser reaches 30.8%, and the output power is 19.6W.
Example 5
As shown in fig. 1, a first pump laser 11, a second pump laser 12, a beam combiner 13, a first fiber bragg grating 14, a second fiber bragg grating 15, an Er-Yb co-doped gain fiber 16, a first single-mode fiber 17, a second single-mode fiber 18, a third single-mode fiber 20, a first coupling output mirror 19, and a second coupling output mirror 21.
The wavelengths of the first pump light and the second pump light output by the first pump laser 11 and the second pump laser 12 are 977nm and 978nm, respectively.
The beam combiner 13 is a high-power optical fiber beam combiner 13, the working wavelength of the high-power optical fiber beam combiner is 975.8nm and 1544.8nm, and the damage threshold is more than 30W;
the peak reflectivity of the first fiber Bragg grating 14 at 1545.0nm is 99.6%, and the bandwidth is 0.4 nm; the second fiber bragg grating 15 has a transmittance of 12% at a wavelength of 1545.0nm and a bandwidth of 0.7 nm.
The Er-Yb co-doped gain fiber 16 is a double-clad multimode fiber; the length of the Er-Yb co-doped gain fiber 16 is 1.9 m.
The first single-mode fiber 17, the second single-mode fiber 18, and the third single-mode fiber 20 are standard 28 communication single-mode fibers, and the lengths thereof are all 0.6 m.
The first pump light and the second pump light are coupled into an Er-Yb co-doped gain fiber 16 after being combined by a beam combiner 13, and Yb is obtained3+Absorbing pump light from ground state2F7/2Transition to metastable state2F5/2Then through Yb3+Act of2F5/2Yb of energy level3+With the ground state4I15/2Er of energy level3+Cross-relaxation occurs to thereby change Yb3+The energy on is transferred to Er3+. Er with energy3+Transition from ground state to4I11/2Energy level, then Er3+Is/are as follows4I11/2Energy level transitions down to other forms4I13/2Energy level then of4I13/2Energy level returning to ground state4I15/2Emitting light in the 1.55 μm band, and Yb3+Returning to the excited state due to the releasing ability. In Er-Yb co-doping system, Er3+Excited radiation is generated to generate laser light, Yb3+Can not generate stimulated radiation and plays a role in energy transfer, Yb3+The absorption of pump light is far greater than Er3+Therefore, the energy utilization rate of the laser is greatly improved, the overall oblique efficiency of the laser reaches 32.6%, and the output power is 19.8W.
To sum up, the utility model provides a 1.55 micron single mode Er-Yb is doping type full fiber laser altogether, include: the device comprises a first pump laser, a second pump laser, a beam combiner, a first fiber Bragg grating, a second fiber Bragg grating, an Er-Yb co-doped gain fiber, a first single-mode fiber, a second single-mode fiber and a first coupling output mirror; the first pump laser is used for generating first pump light; the second pump laser is used for generating second pump light; the first fiber Bragg grating and the second fiber Bragg grating form an optical resonant cavity, and the Er-Yb co-doped gain fiber is positioned in the optical resonant cavity; the first single-mode fiber and the second single-mode fiber are respectively welded at two ends of the Er-Yb co-doped gain fiber and used for keeping the single-mode state of the optical resonant cavity. The laser has the advantages that the whole structure is compact, the first single mode fiber and the second single mode fiber play a role in filtering high-order modes, the single mode state of the resonant cavity is kept, a laser beam output by the laser has high quality and stability, the conversion efficiency is high, the cost is low, the operation is easy, the laser is suitable for obtaining high-power single-mode 1.55 mu m laser output, and the commercialization is easy to realize.
It should be understood that the application of the system of the present invention is not limited to the above examples, and that modifications and variations can be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to fall within the scope of the appended claims.
Claims (8)
1. A1.55 micron single-mode Er-Yb co-doped all-fiber laser is characterized by comprising a first pump laser, a second pump laser, a beam combiner, a first fiber Bragg grating, a second fiber Bragg grating, an Er-Yb co-doped gain fiber, a first single-mode fiber, a second single-mode fiber and a first coupling output mirror; wherein the content of the first and second substances,
the first pump laser is used for generating first pump light;
the second pump laser is used for generating second pump light;
the first fiber Bragg grating and the second fiber Bragg grating form an optical resonant cavity, and the Er-Yb co-doped gain fiber is positioned in the optical resonant cavity;
the first single-mode fiber and the second single-mode fiber are respectively welded to two ends of the Er-Yb co-doped gain fiber and used for keeping a single-mode state of the optical resonant cavity;
and after the first pump light and the second pump light are combined by the beam combiner, the first pump light and the second pump light are coupled and enter the Er-Yb co-doped gain fiber, and are oscillated in the optical resonant cavity to form 1.55 mu m laser which is output by the first coupling output mirror.
2. The 1.55 μm single-mode Er-Yb co-doped all-fiber laser of claim 1, wherein the first and second pump lasers output first and second pump light with a wavelength of 976nm ± 2 nm.
3. The 1.55 micron single mode Er-Yb co-doped all fiber laser of claim 2, wherein the operating wavelengths of the combiner are 976nm ± 0.5nm and 1545nm ± 0.5 nm; the damage threshold of the beam combiner is more than 30W.
4. The 1.55 micron single mode Er-Yb co-doped all fiber laser of claim 3, wherein the bandwidth of the first fiber Bragg grating is 0.3nm to 0.5 nm; the reflectivity of the first fiber Bragg grating to 1545nm +/-0.5 nm laser is more than 99.5%.
5. The 1.55 μm single-mode Er-Yb co-doped all-fiber laser of claim 1, wherein the bandwidth of the second fiber bragg grating is 0.5nm to 0.7 nm; the laser transmittance of the second fiber Bragg grating to 1545nm +/-0.5 nm is more than 10%.
6. The 1.55 micron single mode Er-Yb co-doped all fiber laser of claim 5, wherein said Er-Yb co-doped gain fiber is a double clad multimode fiber; the length of the Er-Yb co-doped gain fiber is 1.5 m-2 m.
7. The 1.55 micron single mode Er-Yb co-doped all fiber laser of claim 6, further comprising a third single mode fiber; the third single-mode fiber is arranged between the second fiber Bragg grating and the first coupling output mirror.
8. The 1.55 micron single mode Er-Yb co-doped all fiber laser of claim 7, further comprising a second coupled-output mirror; the second coupling-out mirror is used for receiving and outputting the laser beam transmitted by the first fiber Bragg grating.
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| CN117154527B (en) * | 2023-08-31 | 2024-04-12 | 山西大学 | Dual-color associated light beam generation device and method based on dual-doped gain medium |
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