CN105244738A - Single-frequency narrow linewidth green laser device - Google Patents
Single-frequency narrow linewidth green laser device Download PDFInfo
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- CN105244738A CN105244738A CN201510673568.4A CN201510673568A CN105244738A CN 105244738 A CN105244738 A CN 105244738A CN 201510673568 A CN201510673568 A CN 201510673568A CN 105244738 A CN105244738 A CN 105244738A
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Abstract
The invention discloses a single-frequency narrow linewidth green laser device, which comprises a 1064nm-band single-frequency narrow linewidth ring cavity ytterbium-doped fiber laser device (100), a polarization-maintaining ytterbium-doped fiber amplifier (20) and a periodically poled lithium niobate (PPLN) optical waveguide-based frequency-doubling system (30), wherein laser output by the 1064nm-band single-frequency narrow linewidth ring cavity ytterbium-doped fiber laser (100) is amplified through the polarization-maintaining ytterbium-doped fiber amplifier (20), is directly injected into the PPLN optical waveguide-based frequency-doubling system (30) through an optical fiber and is doubled into 532nm-band single-frequency narrow linewidth green laser. Compared with the prior art, the single-frequency narrow linewidth green laser device has the advantages that the 1064nm-band single-frequency narrow linewidth ring cavity ytterbium-doped fiber laser device is adopted as a seed source; and the single-frequency narrow linewidth green laser with high performance is obtained by frequency doubling of a PPLN frequency-doubling crystal waveguide through the polarization-maintaining ytterbium-doped fiber amplifier, so that the structure is simple and compact.
Description
Technical field
The present invention relates to a kind of novel green laser, especially a kind of single mode narrow linewidth green (light) laser.
Background technology
Green laser is widely used in fields such as laser display, laser sensing, medical treatment, industrial processes.Green laser generally adopts solid state laser to be realized by the frequency multiplication mode in chamber, outside chamber, and adopts the optical element of spacial alignment in whole system, complex structure, and most green laser is free polarization multi-mode laser, and live width is wider.It is high that fiber laser has conversion efficiency, good stability, narrow linewidth, the advantages such as compact conformation.In recent years, along with the application of Novel cycle polarization reversal lithium niobate (PPLN) fiber waveguide, adopt fiber laser as frequency multiplication seed source, waveguide type PPLN frequency-doubling crystal is as frequency doubling system, the green laser obtaining compact conformation performance stable becomes possibility, this green laser production method is full fiber type, avoids and adopts space optics complex alignment and periodic maintenance.
Summary of the invention
Technical problem to be solved by this invention there are provided the single mode narrow linewidth green (light) laser of a kind of narrow linewidth, long coherence length.
Single-frequency green laser, except the advantage with conventional laser, also has the advantage such as narrow linewidth, long coherence length, and this has good application at laser sensing and relevant detection field.
The present invention is achieved by the following technical solutions, a kind of single mode narrow linewidth green (light) laser, comprise 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser (100), protect inclined ytterbium doped optical fiber amplifier (20) and the frequency doubling system (30) based on PPLN fiber waveguide, the laser that 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser (100) exports is after protecting inclined ytterbium doped optical fiber amplifier (20) and amplifying, the frequency doubling system (30) based on PPLN fiber waveguide is directly injected and frequency multiplication is 532nm wave band single mode narrow linewidth green glow by optical fiber.
As the technical scheme optimized, the 532nm wave band single mode narrow linewidth green glow after frequency multiplication is separated through spectroscope with remaining 1064nm laser.
More specifically, described 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser (100) comprises as the 976nm semiconductor laser (1) of pump light source, 980/1064nm polarization maintaining optical fibre wavelength division multiplexer (2), protects inclined Yb dosed optical fiber (3), Fiber Bragg Grating FBG (7) that polarization-maintaining fiber coupler (4), polarization maintaining fiber ring device (5), non-pumping Yb dosed optical fiber (6), centre wavelength are 1064nm wave band, and polarization preserving fiber isolator (8);
Polarization maintaining optical fibre wavelength division multiplexer (2), protect inclined Yb dosed optical fiber (3), polarization-maintaining fiber coupler (4) and polarization maintaining fiber ring device (5) are interconnected to form annular chamber, semiconductor laser (1) connects a port of polarization maintaining optical fibre wavelength division multiplexer (2), the b port of polarization maintaining optical fibre wavelength division multiplexer (2) connects the first end protecting inclined Yb dosed optical fiber (3), the second end protecting inclined Yb dosed optical fiber (3) connects the c port of polarization maintaining fiber ring device (5), the a port of polarization maintaining fiber ring device (5) connects the b port of polarization-maintaining fiber coupler (4), the a port of polarization-maintaining fiber coupler (4) connects the c port of polarization maintaining optical fibre wavelength division multiplexer (2), the b port of polarization maintaining fiber ring device (5) is by non-pumping Yb dosed optical fiber (6) connecting fiber Bragg grating (7), the c port of polarization-maintaining fiber coupler (4) is connected by polarization preserving fiber isolator (8) protects inclined ytterbium doped optical fiber amplifier (20),
Semiconductor laser (1) enters through polarization maintaining optical fibre wavelength division multiplexer (2) and protects inclined Yb dosed optical fiber (3), Yb3+ is made to form population inversion, the fluorescence that the inclined Yb dosed optical fiber of described guarantor (3) produces is along counterclockwise transmission, protect fluorescence that inclined Yb dosed optical fiber (3) produces successively through polarization maintaining optical fibre wavelength division multiplexer (2), polarization-maintaining fiber coupler (4), the a port of polarization maintaining fiber ring device (5), b port, by non-pumping Yb dosed optical fiber (6), non-pumping Yb dosed optical fiber (6) is reflected back through Fiber Bragg Grating FBG (7), through the b port of polarization maintaining fiber ring device (5), c port returns in main loop chamber, after circulation amplify vibration repeatedly, formation laser is exported by polarization-maintaining fiber coupler (4) and polarization preserving fiber isolator (8) and enters the inclined ytterbium doped optical fiber amplifier of guarantor (20) and amplifies.
More specifically, the inclined ytterbium doped optical fiber amplifier of described guarantor (20) is single-stage two-way pumping configuration, comprise the first polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (10) that are connected successively, protect inclined Yb dosed optical fiber (11), second polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (12), polarization preserving fiber isolator (14), first single mode or multimode 976nm diode-end-pumped light (9) connect the first polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (10), second single mode or multimode 976nm diode-end-pumped light (13) connect the second inclined optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (12),
First, second single mode or multimode 976nm diode-end-pumped light (9), (13) are entered protected inclined Yb dosed optical fiber (11) by first, second 980/1064nm polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (10), (12), realize Yb3+ and form population inversion, seed light enters the frequency doubling system (30) based on PPLN fiber waveguide by the second single mode or multimode 976nm diode-end-pumped light (13), 1064nm wave band polarization preserving fiber isolator (14) after being amplified after passing through successively;
Protecting inclined ytterbium doped optical fiber amplifier (20) is single-stage two-way pumping configuration, or the unidirectional pumping configuration of single-stage or multiple single-stage two-way pumping configuration, single-stage check configuration cascading structure.
Optimize, what the inclined Yb dosed optical fiber of described guarantor (11) adopted is protect partially single covering Yb dosed optical fiber or protect inclined Double Cladding Ytterbium Doped Fiber.
More specifically, the described frequency doubling system based on PPLN fiber waveguide (30) comprises PPLN crystal waveguide (15) and 532/1064nm dichroscope (16), 1064nm wave band single mode narrow linewidth annular chamber Yb dosed optical fiber laser after protecting inclined ytterbium doped optical fiber amplifier (20) and amplifying injects PPLN crystal waveguide (15) by optical fiber and realizes frequency multiplication generation 532nm wave band single-frequency green laser, exported by free space or optical fiber output, 532nm wave band single mode narrow linewidth green glow is separated by 532/1064nm dichroscope (16) with the 1064nm wave band of laser not changing remainder.
The present invention has the following advantages compared to existing technology: adopt 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser as seed source, amplify through protecting inclined ytterbium doped optical fiber amplifier, high performance single mode narrow linewidth green laser is obtained by PPLN frequency-doubling crystal waveguide frequency multiplication, simple and compact for structure.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser spectrogram.
Number in the figure: 1001064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser, 20 protect inclined ytterbium doped optical fiber amplifier, 30PPLN frequency-doubling crystal waveguide frequency doubling system, 1 semiconductor laser, 2980/1064nm polarization maintaining optical fibre wavelength division multiplexer, 3 protect inclined Yb dosed optical fiber, 4 polarization-maintaining fiber couplers, 5 polarization maintaining fiber ring devices, 6 non-pumping Yb dosed optical fibers, 7 Fiber Bragg Grating FBGs, 8 polarization preserving fiber isolators, 9 semiconductor lasers, 10980/1064nm polarization maintaining optical fibre wavelength division multiplexer, 11 protect inclined Yb dosed optical fiber, 12980/1064nm polarization maintaining optical fibre wavelength division multiplexer, 13 semiconductor lasers, 14 polarization preserving fiber isolators, the waveguide of 15PPLN frequency-doubling crystal, 16 dichroscopes.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, in the present embodiment, a kind of single mode narrow linewidth green (light) laser, comprises 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser 100, protects inclined ytterbium doped optical fiber amplifier 20 and the frequency doubling system 30 based on PPLN (periodically poled LiNbO3) fiber waveguide.
The laser that 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser 100 exports, after protecting inclined ytterbium doped optical fiber amplifier 20 and amplifying, directly to be injected based on the frequency doubling system 30 of PPLN fiber waveguide by optical fiber and frequency multiplication is 532nm wave band single mode narrow linewidth green glow.532nm wave band single mode narrow linewidth green glow after frequency multiplication is separated through spectroscope with remaining 1064nm wave band of laser.
Described 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser 100 comprises as the 976nm semiconductor laser 1 of pump light source, 980/1064nm polarization maintaining optical fibre wavelength division multiplexer 2, protects inclined Yb dosed optical fiber 3, Fiber Bragg Grating FBG 7 that polarization-maintaining fiber coupler 4, polarization maintaining fiber ring device 5, non-pumping Yb dosed optical fiber 6, centre wavelength are 1064nm wave band, and polarization preserving fiber isolator 8.
Polarization maintaining optical fibre wavelength division multiplexer 2, protect inclined Yb dosed optical fiber 3, polarization-maintaining fiber coupler 4 and polarization maintaining fiber ring device 5 and be interconnected to form annular chamber.Semiconductor laser 1 connects a port of polarization maintaining optical fibre wavelength division multiplexer 2, the b port of polarization maintaining optical fibre wavelength division multiplexer 2 connects the first end protecting inclined Yb dosed optical fiber 3, the second end protecting inclined Yb dosed optical fiber 3 connects the c port of polarization maintaining fiber ring device 5, the a port of polarization maintaining fiber ring device 5 connects the b port of polarization-maintaining fiber coupler 4, the a port of polarization-maintaining fiber coupler 4 connects the c port of polarization maintaining optical fibre wavelength division multiplexer 2, the b port of polarization maintaining fiber ring device 5 is by non-pumping Yb dosed optical fiber 6 connecting fiber Bragg grating 7, the c port of polarization-maintaining fiber coupler 4 is connected by polarization preserving fiber isolator 8 protects inclined ytterbium doped optical fiber amplifier 20.
Semiconductor laser 1 enters through polarization maintaining optical fibre wavelength division multiplexer 2 and protects inclined Yb dosed optical fiber 3, Yb3+ is made to form population inversion, the fluorescence that described guarantor inclined Yb dosed optical fiber 3 produces is less along counter clockwise direction loss, protect the fluorescence of inclined Yb dosed optical fiber 3 generation successively through polarization maintaining optical fibre wavelength division multiplexer 2, polarization-maintaining fiber coupler 4, the a port of polarization maintaining fiber ring device 5, b port, by non-pumping Yb dosed optical fiber 6, be reflected back non-pumping through Fiber Bragg Grating FBG 7 and protect inclined Yb dosed optical fiber 6, through the b port of polarization maintaining fiber ring device 5, c port, protect inclined Yb dosed optical fiber 3, polarization maintaining optical fibre wavelength division multiplexer 2, after circulation amplify vibration repeatedly, formation laser is exported by polarization-maintaining fiber coupler 4 and polarization preserving fiber isolator 8 and enters the inclined ytterbium doped optical fiber amplifier 20 of guarantor and amplifies.Fiber Bragg Grating FBG 7 and the dynamic raster of the write certainly acting in conjunction introduced at the saturated absorption that non-pumping Yb dosed optical fiber 6 produces, guarantee single-frequency narrow-linewidth laser is formed.The use of the inclined device of all risk insurance ensures single polarization output that laser is stable.1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser spectrogram is shown in Fig. 2.
The inclined ytterbium doped optical fiber amplifier 20 of described guarantor is single-stage two-way structures.Comprise connected successively the first polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device 10, protect inclined Yb dosed optical fiber 11, second polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device 12, polarization preserving fiber isolator 14; first single mode or multimode 976nm diode-end-pumped light 9 connect the first polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device 10, second single mode or multimode 976nm diode-end-pumped light 13 and connect the second inclined optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device 12.
The laser that described 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser 100 produces enters the first polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device 10.
The inclined Yb dosed optical fiber of guarantor 11 adopted protects partially single covering Yb dosed optical fiber or protects inclined Double Cladding Ytterbium Doped Fiber.First, second single mode or multimode 976nm diode-end-pumped light 9,13 are entered by first, second 980/1064nm polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device 10,12 and protect inclined Yb dosed optical fiber 11; realize Yb3+ and form population inversion; seed light enters frequency doubling system 30,1064nm wave band polarization preserving fiber isolator 14 based on PPLN fiber waveguide in order to remove backward reverberation by polarization preserving fiber isolator 14 after being amplified after passing through successively.
The described frequency doubling system 30 based on PPLN fiber waveguide comprises PPLN crystal waveguide 15 and 532/1064nm dichroscope 16.With semiconductor chilling plate (TEC) in PPLN crystal waveguide 15 encapsulates, PPLN crystal waveguide is made to have efficient shg efficiency by regulating temperature.1064nm wave band single mode narrow linewidth annular chamber Yb dosed optical fiber laser after protecting inclined ytterbium doped optical fiber amplifier 20 and amplifying injects PPLN crystal waveguide 15 by optical fiber and realizes frequency multiplication generation 532nm wave band single-frequency green laser, is exported or optical fiber output by free space.532nm wave band single mode narrow linewidth green glow is separated by 532/1064nm dichroscope 16 with the 1064nm wave band of laser not changing remainder.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a single mode narrow linewidth green (light) laser, it is characterized in that, comprise 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser (100), protect inclined ytterbium doped optical fiber amplifier (20) and the frequency doubling system (30) based on PPLN fiber waveguide, the laser that 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser (100) exports, after protecting inclined ytterbium doped optical fiber amplifier (20) and amplifying, directly injects the frequency doubling system (30) based on PPLN fiber waveguide by optical fiber and frequency multiplication is 532nm wave band single mode narrow linewidth green glow.
2. a kind of single mode narrow linewidth green (light) laser according to claim 1, it is characterized in that, described 1064nm wave band single mode narrow linewidth annular chamber ytterbium-doping optical fiber laser (100) comprises the 976nm semiconductor laser (1) as pump light source, 980/1064nm polarization maintaining optical fibre wavelength division multiplexer (2), protect inclined Yb dosed optical fiber (3), polarization-maintaining fiber coupler (4), polarization maintaining fiber ring device (5), non-pumping Yb dosed optical fiber (6), centre wavelength is the Fiber Bragg Grating FBG (7) of 1064nm wave band, and polarization preserving fiber isolator (8),
Polarization maintaining optical fibre wavelength division multiplexer (2), protect inclined Yb dosed optical fiber (3), polarization-maintaining fiber coupler (4) and polarization maintaining fiber ring device (5) are interconnected to form annular chamber, semiconductor laser (1) connects a port of polarization maintaining optical fibre wavelength division multiplexer (2), the b port of polarization maintaining optical fibre wavelength division multiplexer (2) connects the first end protecting inclined Yb dosed optical fiber (3), the second end protecting inclined Yb dosed optical fiber (3) connects the c port of polarization maintaining fiber ring device (5), the a port of polarization maintaining fiber ring device (5) connects the b port of polarization-maintaining fiber coupler (4), the a port of polarization-maintaining fiber coupler (4) connects the c port of polarization maintaining optical fibre wavelength division multiplexer (2), the b port of polarization maintaining fiber ring device (5) is by non-pumping Yb dosed optical fiber (6) connecting fiber Bragg grating (7), the c port of polarization-maintaining fiber coupler (4) is connected by polarization preserving fiber isolator (8) protects inclined ytterbium doped optical fiber amplifier (20),
Semiconductor laser (1) enters through polarization maintaining optical fibre wavelength division multiplexer (2) and protects inclined Yb dosed optical fiber (3), Yb3+ is made to form population inversion, the fluorescence that the inclined Yb dosed optical fiber of described guarantor (3) produces is along counterclockwise transmission, protect fluorescence that inclined Yb dosed optical fiber (3) produces successively through polarization maintaining optical fibre wavelength division multiplexer (2), polarization-maintaining fiber coupler (4), the a port of polarization maintaining fiber ring device (5), b port, by non-pumping Yb dosed optical fiber (6), non-pumping Yb dosed optical fiber (6) is reflected back through Fiber Bragg Grating FBG (7), through the b port of polarization maintaining fiber ring device (5), c port returns in main chamber, after circulation amplify vibration repeatedly, formation laser is exported by polarization-maintaining fiber coupler (4) and polarization preserving fiber isolator (8) and enters the inclined ytterbium doped optical fiber amplifier of guarantor (20) and amplifies.
3. a kind of single mode narrow linewidth green (light) laser according to claim 1, it is characterized in that, the inclined ytterbium doped optical fiber amplifier of described guarantor (20) is single-stage two-way pumping configuration, comprise the first polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (10) that are connected successively, protect inclined Yb dosed optical fiber (11), second polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (12), polarization preserving fiber isolator (14), first single mode or multimode 976nm diode-end-pumped light (9) connect the first polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (10), second single mode or multimode 976nm diode-end-pumped light (13) connect the second inclined optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (12),
First, second single mode or multimode 976nm diode-end-pumped light (9), (13) are entered protected inclined Yb dosed optical fiber (11) by first, second 980/1064nm polarization maintaining optical fibre wavelength division multiplexer or polarization maintaining optical fibre bundling device (10), (12), realize Yb3+ and form population inversion, seed light enters the frequency doubling system (30) based on PPLN fiber waveguide by the second single mode or multimode 976nm diode-end-pumped light (13), 1064nm wave band polarization preserving fiber isolator (14) after being amplified after passing through successively;
Protecting inclined ytterbium doped optical fiber amplifier (20) is single-stage two-way pumping configuration, or the unidirectional pumping configuration of single-stage or multiple single-stage two-way pumping configuration, single-stage check configuration cascading structure.
4. a kind of single mode narrow linewidth green (light) laser according to claim 3, is characterized in that, what the inclined Yb dosed optical fiber of described guarantor (11) adopted is protect partially single covering Yb dosed optical fiber or protect inclined Double Cladding Ytterbium Doped Fiber.
5. a kind of single mode narrow linewidth green (light) laser according to claim 3, it is characterized in that, the described frequency doubling system based on PPLN fiber waveguide (30) comprises PPLN crystal waveguide (15) and 532/1064nm dichroscope (16), 1064nm wave band single mode narrow linewidth annular chamber Yb dosed optical fiber laser after protecting inclined ytterbium doped optical fiber amplifier (20) and amplifying injects PPLN crystal waveguide (15) by optical fiber and realizes frequency multiplication generation 532nm wave band single-frequency green laser, exported by free space or optical fiber output, 532nm wave band single mode narrow linewidth green glow is separated by 532/1064nm dichroscope (16) with the 1064nm wave band of laser not changing remainder.
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| CN112787207A (en) * | 2021-02-05 | 2021-05-11 | 中国人民解放军国防科技大学 | High-power narrow linewidth optical fiber laser based on ring cavity oscillator seed source |
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Application publication date: 20160113 |