CN114825002A - Ultrashort-cavity multi-wavelength single-frequency laser based on doping of different rare earth nanoparticles - Google Patents
Ultrashort-cavity multi-wavelength single-frequency laser based on doping of different rare earth nanoparticles Download PDFInfo
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- 239000002105 nanoparticle Substances 0.000 title claims abstract description 64
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 51
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 36
- 239000000835 fiber Substances 0.000 claims abstract description 64
- 239000013307 optical fiber Substances 0.000 claims abstract description 31
- 238000002310 reflectometry Methods 0.000 claims abstract description 25
- -1 rare earth ions Chemical class 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 230000010287 polarization Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 description 20
- 230000001427 coherent effect Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
Abstract
The invention belongs to the technical field of fiber lasers, and particularly relates to an ultrashort-cavity multi-wavelength single-frequency laser based on doping of different rare earth nanoparticles. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping comprises a pumping source, an optical fiber wavelength division multiplexer, a Bragg grating group, a gain optical fiber and a high-reflection mirror which are sequentially arranged along an optical path; the Bragg grating group and the high-reflection mirror form an ultrashort linear laser resonant cavity; the gain fiber is positioned in the resonant cavity, one end of the gain fiber is connected with the grid region of the Bragg grating group, and the other end of the gain fiber is attached to the high-reflectivity mirror; the gain optical fiber is doped with rare earth ions wrapped by more than two types of nano particles. The invention realizes the ultrashort cavity dual-wavelength laser by using the gain fiber doped with different rare earth nanoparticles, has a more compact and stable structure than the existing dual-wavelength laser, and has low manufacturing cost, and can realize the advantages of large output wavelength interval, good wavelength selectivity and the like.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to an ultrashort-cavity multi-wavelength single-frequency laser based on doping of different rare earth nanoparticles.
Background
The single-frequency optical fiber laser has the advantages of narrow line width, low noise, long coherent length and the like, and has important application in the fields of coherent optical communication, high-precision coherent ranging, coherent laser radar, high-precision spectrum, gravitational wave detection and the like. Particularly in high-precision coherent ranging, the single-frequency laser has extremely high measurement precision due to the extremely narrow line width. However, in some special application environments, such as in atmospheric sounding, due to the uneven distribution and random fluctuation of the atmospheric refractive index, certain measurement errors are caused, and thus the uncertainty of the distance measurement is increased. In order to reduce the error in the measurement process and increase the accuracy of the system, a two-color interferometry is usually used to compensate the distance error caused by the refractive index of air. Compared with the traditional coherent ranging system, the bicolor coherent measurement system needs to use two single-frequency lasers with different wavelengths as detection light sources at the same time, and the distance between the two wavelengths is required to be large enough to reduce errors caused by calculation.
The double-color single-frequency light source can be obtained by two modes, one mode is realized by combining two single-frequency lasers with different wavelengths, the mode needs to build two laser systems respectively, and then the two lasers are combined by an additional system, so that the system is complex and the cost is high. The other mode is to use a dual-wavelength single-frequency fiber laser as a light source, and the dual-wavelength single-frequency fiber laser also has two implementation modes, namely, the implementation mode is realized based on a gain fiber, but the two wavelengths generated by the scheme have smaller interval and need to inhibit intra-cavity mode competition; and secondly, the two gain fibers are adopted for realization, the scheme usually adopts a double-ring cavity structure and a structure that the two gain fibers are cascaded to the same linear cavity, and lasers with the structures usually need to be inserted with more mode selection devices to ensure single-frequency laser operation, so that the structure of the lasers is complex, the output efficiency is low, and the stability is poor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an ultrashort cavity multi-wavelength single-frequency laser based on doping of different rare earth nanoparticles. The laser adopts an ultrashort cavity structure, and has the advantages of compact structure, high efficiency, stable output and the like. The laser is based on optical fibers doped with different rare earth nanoparticles as gain media, and therefore can provide a plurality of wavelengths with a sufficiently large spacing.
The technical scheme adopted by the invention for solving the technical problems is as follows: the ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping comprises a pumping source, an optical fiber wavelength division multiplexer, a Bragg grating group, a gain optical fiber and a high-reflection mirror which are sequentially arranged along an optical path; the Bragg grating group and the high-reflection mirror form an ultrashort linear laser resonant cavity; the gain fiber is positioned in the resonant cavity, one end of the gain fiber is connected with the grid region of the Bragg grating group, and the other end of the gain fiber is attached to the high-reflectivity mirror; the gain optical fiber is doped with rare earth ions wrapped by more than two types of nano particles.
In a preferred embodiment of the present invention, the rare earth ion is selected from Nd 3+ , Yb 3+ , Er 3+ , Tm 3+ , Ho 3+ At least two of the components, the doping amount is 5at% to 20at%, and the components are used for providing laser gains of different wave bands.
Further preferably, the length of the resonant cavity is 1.5 cm.
Further preferably, the pump source is a continuous pump source or a pulsed pump source.
Further preferably, the optical fiber wavelength division multiplexer includes three ports, one of the ports is used as an output end of the dual-wavelength laser, the wavelength output range is greater than 1000 nm, and the other two ports are respectively connected to the pump source and the laser resonator.
Further preferably, the Bragg grating group is a low-reflectivity Bragg grating, the reflectivity is 50% -99%, two reflection wavelengths are arranged in the same grating region, the short-wavelength grating region is located on the inner side of the resonant cavity, the long-wavelength grating region is located on the outer side of the resonant cavity, and the length of the grating region is smaller than 1 mm.
Further preferably, the bragg grating group is a polarization maintaining grating or a non-polarization maintaining grating.
Further preferably, the high-reflection mirror is plated with a broadband dielectric film, and the reflectivity is not less than 99.9%.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts a compact ultrashort cavity structure to obtain dual-wavelength single-frequency laser output, has the advantages of compact and stable structure and low manufacturing cost compared with the existing dual-wavelength laser, can realize the advantages of strong selectivity and large distance of output laser wavelength, and solves the problems of small output wavelength interval of the current dual-wavelength single-frequency laser, complex structure, poor stability and difficult manufacturing of the laser.
2. The gain optical fiber adopted by the invention provides laser gains of different wave bands by doping different rare earth ions, and the rare earth ions are wrapped by the nano particles, so that the different rare earth ions cannot interfere with each other, the respective light emitting characteristics are kept, the problem of unstable laser caused by energy transfer among the rare earth ions in the traditional multi-rare earth doped optical fiber is solved, the wave band requirements of different applications can be met, and the applicability is wide.
Drawings
Fig. 1 is a schematic structural diagram of an ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping provided by the present invention;
fig. 2 is a schematic view of a doping structure of a gain fiber according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural diagram of a Bragg grating array according to the present invention;
FIG. 4 is a graph of the output spectrum of example 1 of the present invention;
wherein, 1, a pumping source; 2. a fiber wavelength division multiplexer; 3. a Bragg grating group; 4. a gain fiber; 5. a high-reflection mirror; 6. a nanoparticle; 7. rare earth A 3+ (ii) a 8. Rare earth B 3+ 。
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Embodiment 1 a structure of an ultrashort cavity dual-wavelength single-frequency laser based on doping of different rare earth nanoparticles, as provided in this embodiment, is shown in fig. 1, and includes a 976 nm pump source 1, a fiber wavelength division multiplexer 2, a bragg grating group 3, a gain fiber 4, and a high-reflection mirror 5, which are sequentially disposed along an optical path.
The pump source 1 is used for emitting pump laser, the Bragg grating group 3 and the high-reflection mirror form an ultrashort linear laser resonant cavity, a temperature control system is arranged outside the resonant cavity to adjust and maintain the temperature of the laser resonant cavity, and the optical fiber wavelength division multiplexer 2 is connected with the pump source 1 and the resonant cavity and injects 976 nm pump laser emitted by the pump source into the resonant cavity.
The pump source 1 described in this embodiment is a continuous pump source, and the center wavelength is 976 nm.
The optical fiber wavelength division multiplexer 2 described in this embodiment includes three ports, one of the ports is used as an output end of the dual-wavelength laser, the wavelength output range is 1000-.
As shown in fig. 3, the bragg grating group 3 provided in this embodiment is a low-reflectivity bragg grating, the reflectivity is 50% to 99%, the length of the grating region is 0.5 mm, two reflection wavelengths, 1064 nm and 1550 nm, are provided in the grating region, wherein the short-wavelength grating region is located inside the resonant cavity, and the long-wavelength grating region is located outside the resonant cavity. The bragg grating group 3 is a non-polarization maintaining grating, so that dual-wavelength laser output can be realized.
The gain fiber 4 provided in this embodiment is an Er/Yb nanoparticle co-doped fiber, as shown in fig. 2, the Er is included in the fiber 3+ Ions 7 and Yb 3+ Ion 8 two different rare earth ion doped Y 2 O 3 Nanoparticle 9, rare earth Er 3+ 7 and rare earth Yb 3+ 8 are respectively wrapped in different Y 2 O 3 The nanoparticles 9 do not interfere with each other. Er in gain fiber 3+ Ions 7 and Yb 3+ The doping amounts of the ions 8 were 10at% and 10at%, respectively. Wherein Er 3+ Providing laser gain of 1550 nm wavelength, Yb 3+ Provides laser gain with 1064 nm wavelength, and the length of the Er/Yb nano-particle co-doped fiber is 1 cm.
The Er/Yb nano-particle co-doped gain fiber is used as a laser gain medium and is positioned in the resonant cavity, one end of the Er/Yb nano-particle co-doped gain fiber is directly connected with the grid region of the Bragg grating group 3 through welding, and the other end of the Er/Yb nano-particle co-doped gain fiber is attached to the high-reflection mirror and is used for providing laser gains of 1 micrometer and 1.5 micrometer wave bands in the cavity simultaneously. The cavity length of the laser resonant cavity is only 1.5 cm, which ensures the large enough longitudinal mode spacing in the cavity, and the bragg grating group 3 is a dual-wavelength narrow-band grating, the two central wavelengths are respectively located at 1 μm and 1.5 μm, which is used for realizing the selection of the wavelength and the mode, and finally realizing the output of the 1 μm and 1.5 μm dual-wavelength single-frequency laser, as shown in fig. 4.
The high-reflectivity mirror 5 in this embodiment is plated with a broadband dielectric film, and the reflectivity is not less than 99.9%.
Embodiment 2 a structure of an ultrashort cavity dual-wavelength single-frequency laser based on doping of different rare earth nanoparticles, as shown in fig. 1, includes a 976 nm pump source 1, a fiber wavelength division multiplexer 2, a bragg grating group 3, a gain fiber 4, and a high-reflectivity mirror 5, which are sequentially disposed along an optical path.
The pump source 1 is used for emitting pump laser, the Bragg grating group 3 and the high-reflection mirror form an ultrashort linear laser resonant cavity, a temperature control system is arranged outside the resonant cavity to adjust and maintain the temperature of the laser resonant cavity, and the optical fiber wavelength division multiplexer 2 is connected with the pump source 1 and the resonant cavity and injects 976 nm pump laser emitted by the pump source into the resonant cavity.
The pump source 1 described in this embodiment is a pulse pump source, and the center wavelength is 976 nm to realize pulse dual-wavelength single-frequency laser output.
The optical fiber wavelength division multiplexer 2 described in this embodiment includes three ports, one of the ports is used as an output end of the dual-wavelength laser, the wavelength output range is 1000-.
The bragg grating group 3 of the present embodiment is a low-reflectivity bragg grating, the reflectivity is 50% to 99%, the length of the grating region is 0.5 mm, two reflection wavelengths, which are 1064 nm and 1940nm, are provided in the grating region, wherein the short-wavelength grating region is located inside the resonant cavity, and the long-wavelength grating region is located outside the resonant cavity. The bragg grating group 3 is a non-polarization maintaining grating, so that dual-wavelength laser output can be realized.
The gain fiber provided by the embodiment is a Yb/Tm nanoparticle co-doped gain fiber, and the fiber contains Yb 3+ Ion and Tm 3+ Y doped with two different rare earth ions 2 O 3 Nanoparticles of rare earth Yb 3+ Ion and Tm 3+ The ions are respectively wrapped in different Y 2 O 3 In the nano particles, the particles do not interfere with each other. Yb in gain fiber 3+ Ion and Tm 3+ The doping amount of the ions was 10at% and 15at%, respectively. Wherein Yb 3+ Providing a laser gain, Tm, at a wavelength of 1064 nm 3+ The laser gain of 1940nm wave band is provided, and the length of the Yb/Tm nanoparticle co-doped gain fiber is 1 cm.
The Yb/Tm nano particle co-doped gain fiber is used as a laser gain medium and is positioned in the resonant cavity, one end of the Yb/Tm nano particle co-doped gain fiber is directly connected with the grid region of the Bragg grating group 3 through welding, and the other end of the Yb/Tm nano particle co-doped gain fiber is attached to the high-reflection mirror and is used for providing laser gains of 1-micrometer and 2-micrometer wave bands in the cavity. The cavity length of the laser resonant cavity is only 1.5 cm, so that the large enough longitudinal mode interval in the cavity is ensured, meanwhile, the Bragg grating group 3 is a dual-wavelength narrow-band grating, the two central wavelengths are respectively positioned at 1 mu m and 2 mu m, the dual-wavelength narrow-band grating is used for realizing the selection of the wavelength and the mode, and finally, the output of the 1 mu m and 2 mu m dual-wavelength single-frequency laser is realized.
The high-reflection mirror 5 in this embodiment is plated with a broadband dielectric film, and the reflectivity is not less than 99.9%.
Embodiment 3 a structure of an ultrashort cavity three-wavelength single-frequency laser based on doping of different rare earth nanoparticles, as shown in fig. 1, includes a 976 nm pump source 1, a fiber wavelength division multiplexer 2, a bragg grating group 3, a gain fiber 4, and a high-reflection mirror 5, which are sequentially disposed along an optical path.
The pump source 1 is used for emitting pump laser, the Bragg grating group 3 and the high-reflection mirror form an ultrashort linear laser resonant cavity, a temperature control system is arranged outside the resonant cavity to adjust and maintain the temperature of the laser resonant cavity, and the optical fiber wavelength division multiplexer 2 is connected with the pump source 1 and the resonant cavity and injects 976 nm pump laser emitted by the pump source into the resonant cavity.
The pump source 1 described in this embodiment is a pulse pump source, and the center wavelength is 976 nm to realize pulse dual-wavelength single-frequency laser output.
The optical fiber wavelength division multiplexer 2 described in this embodiment includes three ports, one of the ports is used as an output end of the dual-wavelength laser, the wavelength output range is 1000-.
The bragg grating group 3 described in this embodiment is a low-reflectivity bragg grating, the reflectivity is 50% to 99%, the length of the grating region is 0.5 mm, three reflection wavelengths are provided in the grating region, respectively 1064 nm, 1550 nm and 1940nm, wherein the short-wavelength grating region is located inside the resonant cavity, and the long-wavelength grating region is located outside the resonant cavity. The bragg grating group 3 is a non-polarization maintaining grating, so that three-wavelength laser output can be realized.
The gain fiber 4 provided by the embodiment is an Er/Yb/Tm nanoparticle co-doped fiber, and the fiber contains Er 3+ Ion, Yb 3+ Ion, Tm 3+ Y doped with three different rare earth ions 2 O 3 Nanoparticles, rare earth Er 3+ Yb of rare earth 3+ Tm of rare earth 3+ Are respectively wrapped at different Y 2 O 3 In the nano particles, the particles do not interfere with each other. Er in gain fiber 3+ Ion, Yb 3+ Ion and Tm 3+ The doping amounts of the ions were 10at%, and 15at%, respectively. Wherein Er 3+ Providing laser gain of 1550 nm wavelength, Yb 3+ Providing a laser gain, Tm, at a wavelength of 1064 nm 3+ Provides laser gain with 1940nm wavelength, and the length of the Er/Yb/Tm nano particle co-doped fiber is 1 cm.
The Er/Yb/Tm nano particle co-doped optical fiber is used as a laser gain medium and is positioned in the resonant cavity, one end of the Er/Yb/Tm nano particle co-doped optical fiber is directly connected with the grid region of the Bragg grating group 3 through welding, and the other end of the Er/Yb/Tm nano particle co-doped optical fiber is attached to the high-reflection mirror and is used for providing laser gains of wave bands of 1 micrometer, 1.5 micrometers and 2 micrometers in the cavity. The cavity length of the laser resonant cavity is only 1.5 cm, so that a large enough longitudinal mode interval in the cavity is ensured, meanwhile, the Bragg grating group 3 is a three-wavelength narrow-band grating, the central wavelength of the three-wavelength narrow-band grating is respectively positioned at 1 mu m, 1.5 mu m and 2 mu m, the three-wavelength narrow-band grating is used for realizing the selection of the wavelength and the mode, and finally, the output of the 1 mu m, 1.5 mu m and 2 mu m three-wavelength single-frequency laser is realized.
Embodiment 4 a structure of an ultrashort cavity four-wavelength single-frequency laser based on doping of different rare earth nanoparticles, as provided in this embodiment, is shown in fig. 1, and includes a 976 nm pump source 1, a fiber wavelength division multiplexer 2, a bragg grating group 3, a gain fiber 4, and a high-reflection mirror 5, which are sequentially disposed along an optical path.
The pump source 1 is used for emitting pump laser, the Bragg grating group 3 and the high-reflection mirror form an ultrashort linear laser resonant cavity, a temperature control system is arranged outside the resonant cavity to adjust and maintain the temperature of the laser resonant cavity, and the optical fiber wavelength division multiplexer 2 is connected with the pump source 1 and the resonant cavity and injects 976 nm pump laser emitted by the pump source into the resonant cavity.
The pump source 1 described in this embodiment is a pulse pump source, and the center wavelength is 976 nm to realize pulse dual-wavelength single-frequency laser output.
The optical fiber wavelength division multiplexer 2 described in this embodiment includes three ports, one of the ports is used as an output end of the dual-wavelength laser, the wavelength output range is 1000-.
The bragg grating group 3 described in this embodiment is a low-reflectivity bragg grating, the reflectivity is 50% to 99%, the length of the grating region is 0.5 mm, two reflection wavelengths, 1064 nm and 1550 nm respectively, are provided in the grating region, wherein the short-wavelength grating region is located inside the resonant cavity, and the long-wavelength grating region is located outside the resonant cavity. The bragg grating group 3 is a polarization maintaining grating, so that four-wavelength laser output can be realized.
The gain fiber 4 provided by this embodiment is an Er/Yb nanoparticle co-doped fiber, and the fiber contains Er 3+ Ion, Yb 3+ Y doped with two different rare earth ions 2 O 3 Nanoparticles, rare earth Er 3+ Yb of rare earth 3+ Are respectively wrapped at different Y 2 O 3 In the nano particles, the particles do not interfere with each other. Er in gain fiber 3+ Ion, Yb 3+ The doping amount of the ions was 10at% and 10at%, respectively. Wherein Er 3+ Providing laser gain of 1550 nm wavelength, Yb 3+ Provides laser gain with 1064 nm wavelength, and the length of the Er/Yb nano-particle co-doped fiber is 1 cm.
The Er/Yb nano-particle co-doped fiber is used as a laser gain medium and is positioned in the resonant cavity, one end of the Er/Yb nano-particle co-doped fiber is directly connected with the grid region of the Bragg grating group 3 through welding, and the other end of the Er/Yb nano-particle co-doped fiber is attached to the high-reflection mirror and is used for simultaneously providing laser gains of wave bands of 1 micrometer and 1.5 micrometers in the cavity. The cavity length of the laser resonant cavity is only 1.5 cm, so that the large enough longitudinal mode interval in the cavity is ensured, meanwhile, the Bragg grating group 3 is a dual-wavelength narrow-band grating, the two central wavelengths are respectively positioned at 1 mu m and 1.5 mu m, the dual-wavelength narrow-band grating is used for realizing the selection of the wavelength and the mode, and finally, the output of the four-wavelength single-frequency laser with the wave bands of 1 mu m and 1.5 mu m is realized.
Embodiment 5a structure of an ultrashort-cavity dual-wavelength single-frequency laser based on doping of different rare earth nanoparticles, as shown in fig. 1, includes a 976 nm pump source 1, a fiber wavelength division multiplexer 2, a bragg grating group 3, an Er/Yb nanoparticle co-doped gain fiber 4, and a high-reflectivity mirror 5, which are sequentially disposed along an optical path.
The pump source 1 is used for emitting pump laser, the Bragg grating group 3 and the high-reflection mirror form an ultrashort linear laser resonant cavity, a temperature control system is arranged outside the resonant cavity to adjust and maintain the temperature of the laser resonant cavity, and the optical fiber wavelength division multiplexer 2 is connected with the pump source 1 and the resonant cavity and injects 976 nm pump laser emitted by the pump source into the resonant cavity.
The pump source 1 described in this embodiment is a continuous pump source, and the center wavelength is 976 nm.
The optical fiber wavelength division multiplexer 2 described in this embodiment includes three ports, one of the ports is used as an output end of the dual-wavelength laser, the wavelength output range is 1000-.
The bragg grating group 3 described in this embodiment is a low-reflectivity bragg grating, the reflectivity is 50% to 99%, the length of the grating region is 0.5 mm, two reflection wavelengths, 1064 nm and 1550 nm respectively, are provided in the grating region, wherein the short-wavelength grating region is located inside the resonant cavity, and the long-wavelength grating region is located outside the resonant cavity. The bragg grating group 3 is a non-polarization maintaining grating, so that dual-wavelength laser output can be realized.
The gain fiber 4 provided by this embodiment is an Er/Yb nanoparticle co-doped fiber, and the fiber contains Er 3+ Ion and Yb 3+ Y doped with two different rare earth ions 2 O 3 Nanoparticle 9, rare earth Er 3+ 7 and rare earth Yb 3+ 8 are respectively wrapped in different Y 2 O 3 The nanoparticles 9 do not interfere with each other. Er in gain fiber 3+ Ion and Yb 3+ The doping amount of the ions was 10at% and 10at%, respectively. Wherein Er 3+ Providing laser gain of 1550 nm wavelength, Yb 3+ Providing a laser gain at a wavelength of 1064 nm, the length of the gain fiber 4 being 1 cm.
The Er/Yb nano-particle co-doped optical fiber is used as a laser gain medium and is positioned in the resonant cavity, one end of the Er/Yb nano-particle co-doped optical fiber is directly connected with the grid region of the Bragg grating group 3 through welding, and the other end of the Er/Yb nano-particle co-doped optical fiber is attached to the high-reflection mirror and is used for providing laser gains of 1 micrometer and 1.5 micrometer wave bands in the cavity simultaneously. The cavity length of the laser resonant cavity is only 1.5 cm, so that the large enough longitudinal mode interval in the cavity is ensured, meanwhile, the Bragg grating group 3 is a dual-wavelength narrow-band grating, the two central wavelengths are respectively positioned at 1 mu m and 1.5 mu m, the dual-wavelength narrow-band grating is used for realizing the selection of the wavelength and the mode, and finally, the output of the dual-wavelength single-frequency laser of 1 mu m and 1.5 mu m is realized.
The high reflection mirror 5 in this embodiment is a saturable absorber mirror, and is plated with a broadband dielectric film, and the reflectivity is not less than 99.9%. And the passive Q-switching dual-wavelength single-frequency laser output is realized.
Claims (9)
1. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping comprises a pumping source, an optical fiber wavelength division multiplexer, a Bragg grating group, a gain optical fiber and a high-reflection mirror which are sequentially arranged along an optical path; the Bragg grating group and the high-reflection mirror form an ultrashort linear laser resonant cavity; the gain fiber is positioned in the resonant cavity, one end of the gain fiber is connected with the grid region of the Bragg grating group, and the other end of the gain fiber is attached to the high-reflectivity mirror; the method is characterized in that: the gain optical fiber is doped with rare earth ions wrapped by more than two types of nanoparticles.
2. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping of claim 1, wherein: the rare earth ions are selected from Nd 3+ , Yb 3+ , Er 3+ , Tm 3+ , Ho 3+ At least two of them, the doping amount is 5at% to 20 at%.
3. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping of claim 1, wherein: the length of the resonant cavity is 1.5 cm.
4. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping of claim 1, wherein: the pump source is a continuous pump source or a pulse pump source.
5. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping of claim 1, wherein: the optical fiber wavelength division multiplexer comprises three ports, wherein one port serves as an output end of the dual-wavelength laser, the wavelength output range is larger than 1000 nm, and the other two ports are respectively connected with the pumping source and the laser resonant cavity.
6. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping of claim 1, wherein: the Bragg grating group is a low-reflectivity Bragg grating, and the reflectivity is 50% -99%.
7. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping of claim 6, wherein: the Bragg grating group has two reflection wavelengths in the same grating region, wherein the short wavelength grating region is positioned at the inner side of the resonant cavity, and the long wavelength grating region is positioned at the outer side of the resonant cavity.
8. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping of claim 6, wherein: the Bragg grating group is a polarization maintaining grating or a non-polarization maintaining grating.
9. The ultrashort cavity multi-wavelength single-frequency laser based on different rare earth nanoparticle doping of any one of claims 1 to 8, wherein: the high-reflection mirror is plated with a broadband dielectric film, and the reflectivity is not less than 99.9%.
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| US20090092157A1 (en) * | 2007-10-09 | 2009-04-09 | Ipg Photonics Corp. | Powerful fiber laser system |
| US20100135627A1 (en) * | 2008-12-02 | 2010-06-03 | Draka Comteq, B.V. | Amplifying Optical Fiber and Production Method |
| CN101933200A (en) * | 2008-02-01 | 2010-12-29 | 阿尔卡特朗讯 | Optical guide doped with rare-earth ions and optical device comprising same |
| CN102565927A (en) * | 2010-12-10 | 2012-07-11 | 德拉克通信科技公司 | Optical fiber, optical fiber laser, and optical amplifier |
| CN102681087A (en) * | 2011-03-04 | 2012-09-19 | 德拉克通信科技公司 | Optical fiber, optical fiber laser, optical amplifier, and optical fiber manufacture method |
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2021
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| US20090092157A1 (en) * | 2007-10-09 | 2009-04-09 | Ipg Photonics Corp. | Powerful fiber laser system |
| CN101933200A (en) * | 2008-02-01 | 2010-12-29 | 阿尔卡特朗讯 | Optical guide doped with rare-earth ions and optical device comprising same |
| US20100135627A1 (en) * | 2008-12-02 | 2010-06-03 | Draka Comteq, B.V. | Amplifying Optical Fiber and Production Method |
| CN102565927A (en) * | 2010-12-10 | 2012-07-11 | 德拉克通信科技公司 | Optical fiber, optical fiber laser, and optical amplifier |
| CN102681087A (en) * | 2011-03-04 | 2012-09-19 | 德拉克通信科技公司 | Optical fiber, optical fiber laser, optical amplifier, and optical fiber manufacture method |
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