CN101447637B - Single longitudinal-mode optical fiber laser with low noise, narrow linewidth and high power - Google Patents
Single longitudinal-mode optical fiber laser with low noise, narrow linewidth and high power Download PDFInfo
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- CN101447637B CN101447637B CN200810220661XA CN200810220661A CN101447637B CN 101447637 B CN101447637 B CN 101447637B CN 200810220661X A CN200810220661X A CN 200810220661XA CN 200810220661 A CN200810220661 A CN 200810220661A CN 101447637 B CN101447637 B CN 101447637B
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Abstract
The invention discloses a single longitudinal-mode optical fiber laser with low noise, narrow linewidth and high power. Polarization maintaining optical fiber is rare-earth-doped phosphate single-mode glass optical fiber, the component of a fiber core is phosphate glass which consists of 70P2O5-8Al2O3-15BaO-4La2O3-3Nd2O3, the fiber core of the polarization maintaining optical fiber is doped with high-concentration luminous ions, the luminous ions are one or combination of more than one of lanthanide ions and transition metal ions, the doping density of the luminous ions is greater than 1*10<19>ions/cm<3> and the luminous ions are evenly doped in the fiber core. A polarization maintaining fiber Bragg grating with the narrow linewidth and a dichroscope form a front cavity mirror and a rear cavity mirror of the optical fiber laser, a centimeter-sized erbium-ytterbium co-doped phosphate glass polarization maintaining optical fiber is taken as a laser working substance, and polarization maintaining output laser generated by a single-mode semiconductor laser is taken as a pumping source, thus achieving the single longitudinal-mode laser output by designing and manufacturing the reflection spectrum width of the polarization maintaining fiber Bragg grating and controlling the cavity length of the whole laser cavity.
Description
Technical field
The present invention relates to fiber laser, particularly relate to the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth, laser linewidth reaches KHz level, power output up to hundreds of mW magnitude.
Background technology
Ultra-narrow wire single frequency laser is with a wide range of applications in fields such as industry, agricultural, military affairs with its excellent coherence property, is especially seeming particularly important aspect long distance, high-precision sensing, laser ranging and the indication.Improve the detection range or the precision of optical-fiber laser, need to use the laser of high coherence property, thereby require laser to have the spectrum width of super-narrow line width, as the single-frequency optical-fiber laser that requires KHz magnitude live width, mW level is as seed source.General quartzy doped fiber be difficult to realize higher-wattage (＞100mW), super-narrow line width (＜2KHz) single-frequency laser output.
Study the ultra-narrow wire single frequency optical-fiber laser at present, adopt the highly doped silica fiber of rare earth ion as laser medium, short straight F-P cavity configuration, generally can only export a few mW single-frequency lasers, adopt the gain media of multicomponent glass optical fiber as single-frequency laser, can realize then that power output 100mW is above, live width is less than the single-frequency optical-fiber laser of 2KHz, as the Yb codoped phosphate glass optical fiber that adopts 2cm to grow, realized that power output is single-frequency optical-fiber laser [the J.Lightwave Technol. of 1.5 μ m less than 2KHz, wavelength greater than 200mW, live width, 2004,22:57].2004, U.S. Alexandria university and NP photon company aspect the research of ultra-narrow wire single frequency optical-fiber laser application rare earth doping phosphoric acid salt glass single mode fiber laser [patent No.: US 6816514B2] and two patents of high power narrow linewidth single frequency optical fiber laser [publication number: US 2004/0240508A1], it is based on (30-80) P
2O
5-(5-30) L
2O
3(L
2O
3: Al
2O, B
2O
3, Y
2O
3, La
2O
3And their mixture)-(5-30) MO (MO:BaO, BeO, MgO, SrO, CaO, ZnO, PbO and their mixture) the rare earth doping phosphoric acid salt glass monomode fiber of this matrix, and various cavity structures have been carried out claim, still, its desired rare earth doping phosphoric acid salt glass monomode fiber does not have polarization property.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, provide a kind of narrow-linewidth single frequency laser that in fibre core, produces the KHz magnitude to protect the ultra-narrow wire single frequency optical fiber laser of output partially.
The present invention utilizes the highly doped and high gain characteristics of phosphate glass core material, design and produce phosphate glass optical fiber with polarization property, adopt short F-P cavity configuration, utilize the frequency-selecting effect of narrow-linewidth polarization-maintaining fiber grating, under the lasting pumping of pump light source, the narrow-linewidth single frequency laser that produces the KHz magnitude in fibre core is protected output partially.Particularly keep and the characteristic of super-narrow line width fiber grating frequency-selecting in conjunction with the unit length high-gain of rare earth doping phosphoric acid salt glass single-mode polarization maintaining fiber, polarization, and optimize key parameters such as gain fibre doping content, length, design and produce short straight F-P cavity configuration again, can realize the single-frequency laser output more low noise, narrow linewidth, that polarization keeps.
Purpose of the present invention is achieved through the following technical solutions:
The high-power single-longitudinal-mode fiber laser of a kind of low noise narrow linewidth, its single mode semiconductor laser pumping source is connected with the pumping input of protecting the partial wave division multiplexer, the common port of guarantor's partial wave division multiplexer is protected inclined to one side bragg grating with narrow linewidth and is connected, narrow linewidth is protected inclined to one side bragg grating and is connected with dichroic mirror through polarization maintaining optical fibre, the signal end of protecting the partial wave division multiplexer is connected with the polarization maintaining optical fibre isolator, and polarization maintaining optical fibre and narrow linewidth are protected inclined to one side bragg grating fixed sealing and be contained in heat sink that automatic temperature-adjusting controls; Described polarization maintaining optical fibre is a rare earth doping phosphoric acid salt single mode glass optical fiber, and the fibre core composition is a phosphate glass, consists of 70P
2O
5-8Al
2O
3-15BaO-4La
2O
3-3Nd
2O
3, the light emitting ionic of the fibre core doped with high concentration of described polarization maintaining optical fibre, described light emitting ionic are one or more assembly in lanthanide ion, the transition metal ions, described light emitting ionic doping content is greater than 1 * 10
19Ions/cm
3, and be even doping in fibre core.
For realizing that further the object of the invention, described polarization maintaining optical fibre fibre core are oval, axial ratio is 1.1-3.0, and minor axis is long to be 3-10 μ m, and covering is circular.
Described polarization maintaining optical fibre is the panda type structure, and fibre core is circular, and diameter is 3-10 μ m, and two panda eye symmetry arrangement, size are consistent, with fibre core spacing from be 20-40 μ m, the panda eye is 10-20 μ m through size directly, covering is a circle.
The bat of described polarization maintaining optical fibre is grown up and is gained greater than 1dB/cm in 5mm, unit length, and fiber lengths is 0.5-5cm.
Described dichroic mirror is for plating film or for the direct side end face behind the polarization maintaining optical fibre grinding and polishing plates film at cavity mirror face, described film to laser signal wavelength reflectivity greater than 90%, to the pumping wavelength transmissivity greater than 90%.
The foveal reflex wavelength that described narrow linewidth is protected inclined to one side bragg grating is a laser output wavelength, and 3dB reflection spectrum width is less than 0.1nm, and the centre wavelength reflectivity is 10-95%.
Coupling between inclined to one side bragg grating of described guarantor and the rare earth doping phosphoric acid salt glass polarization maintaining optical fibre is by directly butt joint coupling behind its corresponding fiber end face of grinding and polishing.
Described lanthanide ion is Er
3+, Yb
3+, Tm
3+, Gd
3+, Tb
3+, Dy
3+, Ho
3+Or Lu
3+
Described transition metal ions is Gu
2+, Co
2+, Cr
3+, Fe
2+Or Mn
2+
Compared with prior art, technique effect of the present invention is: the high-gain rare earth doping phosphoric acid salt glass single-mode polarization maintaining fiber of centimetre magnitude is as the gain media of laser, the preceding Effect of Back-Cavity Mirror of forming short F-P cavity configuration by narrow bandwidth polarization-maintaining fiber grating and dichroic mirror, under the continuous pump in single mode semiconductor laser pumping source 1, highly doped rare earth ion in the fibre core reverses, produce the flashlight of stimulated emission, flashlight is under preceding Effect of Back-Cavity Mirror effect, repeatedly vibrate back and forth and repeatedly amplified, and finally produce laser by narrow-linewidth polarization-maintaining fiber grating coupling output.Because laser cavity length also has only a centimetre magnitude, by the chamber modulus principle of laser as can be known, longitudinal mode spacing in the chamber can reach GHz, as long as narrow bandwidth polarization-maintaining fiber grating reflectance spectrum is enough narrow, as the 3dB reflectance spectrum less than 0.08nm, it is long for only having a single longitudinal mode in the laser cavity of 2cm to be implemented in the chamber, realizes that the stable single longitudinal mode (single-frequency) of no mode hopping and mode competition is protected output partially.Because gain medium is the rare earth doping phosphoric acid salt glass monomode fiber with polarization property, so, single-mode laser is to vibrate with a fixing polarization state in laser cavity, can reduce laser because the noise that the polarization state instability causes, thereby improved the signal to noise ratio of output laser, the pump light of polarization state maintenance simultaneously also is to be input in the fibre core of rare earth doping phosphoric acid salt glass single-mode polarization maintaining fiber by protecting inclined to one side device coupling, can further reduce laser because the noise that pump light polarization state instability causes has also further improved the signal to noise ratio of exporting laser.For realizing laser frequency stabilization, need accurate automatic temp controller control heat sink.Along with the continuous enhancing of pumping light power, the single longitudinal mode laser live width constantly narrows down, and can realize that at last live width reaches the single-frequency optical-fiber laser guarantor output partially of KHz magnitude.Because Doping Phosphorus hydrochlorate glass monomode fiber is designed to polarization maintaining optical fibre through improvement, thereby has a higher extinction ratio, insensitive to bending and twisting stress simultaneously, help eliminating noise and the frequency drift that the single-frequency optical-fiber laser causes because of ambient vibration, thereby further improve the signal to noise ratio of laser, make the single-frequency laser of polarization output have lower noise.
Description of drawings
Fig. 1 is a single frequency optical fiber laser principle schematic of the present invention;
Fig. 2 a is the schematic cross-section of the rare earth doping phosphoric acid salt glass single-mode polarization maintaining fiber of oval fibre core;
Fig. 2 b is the schematic cross-section of panda type rare earth doping phosphoric acid salt glass single-mode polarization maintaining fiber.
Embodiment
The invention will be further described below in conjunction with drawings and Examples, need to prove that the scope of protection of present invention is not limited to the scope of embodiment statement.
As shown in Figure 1, the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth comprises polarization maintaining optical fibre 4, single mode semiconductor laser pumping source 1, protects partial wave division multiplexer 2 (WDM), narrow linewidth is protected inclined to one side bragg grating 3, dichroic mirror 5, polarization maintaining optical fibre isolator 6 and heat sink 7.Single mode semiconductor laser pumping source 1 is connected with the pumping input of protecting partial wave division multiplexer 2, the common port of guarantor's partial wave division multiplexer 2 is protected inclined to one side bragg grating 3 with narrow linewidth and is connected, narrow linewidth is protected inclined to one side bragg grating 3 and is connected with dichroic mirror 5 through polarization maintaining optical fibre 4, the signal end of protecting partial wave division multiplexer 2 is connected with polarization maintaining optical fibre isolator 6, polarization maintaining optical fibre 4 and narrow linewidth protect inclined to one side bragg grating 3 fixed sealing be contained in automatic temperature-adjusting control heat sink 7 in, on the temperature value of heat sink 7 temperature operated by rotary motion in-30～70 ℃ of scopes, and its control precision is come the tuning laser wavelength less than 0.1 ℃ by the control heat sink temperature.Polarization maintaining optical fibre 4 is the polarization maintaining optical fibre 4 of rare earth doping phosphoric acid salt glass single mode, and fibre core 9 compositions are phosphate glass, and the rear-earth-doped ion in the fibre core 9 is erbium, ytterbium or erbium and ytterbium codoping.Same rear-earth-doped ion can be Tm
3+, Gd
3+, Tb
3+, Dy
3+, Ho
3+Or Lu
3+Lanthanide ion.
Narrow bandwidth polarization-maintaining fiber grating 3 and dichroic mirror 5 are formed the preceding Effect of Back-Cavity Mirror of short F-P cavity configuration, and the foveal reflex wavelength of narrow bandwidth polarization-maintaining fiber grating 3 is positioned at the gain spectral of laser medium, and is positioned at the high reflectance spectrum of dichroic mirror 5, and reflectivity is greater than 90%.Pump light adopts single mode LD forward direction pump mode to be input to by the 980nm end coupling of protecting partial wave division multiplexer (WDM) 2 in the fibre core 9 of polarization maintaining optical fibre 4 of the rare earth doping phosphoric acid salt glass single mode in the laser cavity, the rare earth ion that pumping is highly doped, population is reversed, produce the flashlight of stimulated emission, flashlight is under preceding Effect of Back-Cavity Mirror effect, repeatedly vibrate back and forth and repeatedly amplified, and finally produce laser by the 3 coupling outputs of narrow-linewidth polarization-maintaining fiber grating.The coupling of protecting between inclined to one side bragg grating 3 and the rare earth doping phosphoric acid salt glass polarization maintaining optical fibre 4 is by directly butt joint coupling behind their corresponding fiber end faces of grinding and polishing.Dichroic mirror 5 is for plating film or for the direct side end face behind polarization maintaining optical fibre 4 grinding and polishings plates film at cavity mirror face, film to laser signal wavelength reflectivity greater than 90%, to the pumping wavelength transmissivity greater than 90%.The foveal reflex wavelength that narrow linewidth is protected inclined to one side bragg grating 3 is a laser output wavelength, and 3dB reflection spectrum width is less than 0.1nm, and the centre wavelength reflectivity is 10-95%.It is long that narrow linewidth is protected the chamber of the reflection spectrum width of inclined to one side Prague (Bragg) fiber grating 3 and the whole laser cavity of control, realizes having only unique single longitudinal mode laser to protect partially and export.
Embodiment 1
The polarization maintaining optical fibre 4 of high-gain rare earth doping phosphoric acid salt glass single mode is as the gain media of fiber laser, length can be selected according to the reflection spectrum width of device laser output power size and narrow-linewidth polarization-maintaining fiber grating 3, this example is 0.5cm, is generally 0.5～10cm and all can.The light emitting ionic of fibre core 9 doped with high concentration is erbium and ytterbium, and the doping content of erbium, erbium/ytterbium rare earth ion is respectively 2.5 * 10
20Ions/cm
3, 5.0 * 10
20Ions/cm
3, generally be greater than 1 * 10
19Ions/cm
3Shown in Fig. 2 a, fibre core 9 cross section structures of the polarization maintaining optical fibre 4 of rare earth doping phosphoric acid salt glass single mode are oval, and axial ratio is 1.2: 1, is generally 1.1-3.0: 1 all can, minor axis length is 5 μ m, be generally 1-10 μ m all can, covering 8 be a circle.The bat length of this polarization maintaining optical fibre is 6mm.Because Doping Phosphorus hydrochlorate glass monomode fiber is designed to polarization maintaining optical fibre 4, thereby has a higher extinction ratio, insensitive to bending and twisting stress simultaneously, help eliminating noise and the frequency drift that the single-frequency optical-fiber laser causes because of ambient vibration, thereby further improve the signal to noise ratio of laser, signal to noise ratio can reach 65dB.Fibre core 9 compositions of polarization maintaining optical fibre 4 are phosphate glass, and it consists of: 70P
2O
5-8Al
2O
3-15BaO-4La
2O
3-3Nd
2O
3Rare earth ion is uniform high-concentration dopant in fibre core 9.High-gain rare earth doping phosphoric acid salt glass single-mode polarization maintaining fiber 4 is to make prefabricated rods by boring method, rod-in-tube technique: earlier the cladding glass processed being become diameter is the glass bar of 30mm, getting out a major axis again in this center glass rod position is that 2.5mm, minor axis are the elliptical aperture of 2mm, then the inner surface of polished glass elliptical aperture; Secondly, it is that 2.5mm, minor axis are the 2mm ellipse bar that fibre core 9 glass processings are processed into a major axis, and then polishes this ellipse bar outer surface; Once more, the glass of fiber core rod is inserted in the hole in covering 8 glass bars, is assembled into a preform; At last, the preform that assembles be put in the fibre-optical drawing tower draw in the high temperature furnace, finally draw out have protect bias can rare earth doping phosphoric acid salt glass optical fiber 4.
Under the continuous excitation of pumping source, the fibre core 9 middle rare earth ions of the polarization maintaining optical fibre 4 of rare earth doping phosphoric acid salt glass single mode are realized population inversion, the flashlight of being excited to reflect is under the preceding Effect of Back-Cavity Mirror effect of being made of short F-P cavity configuration narrow bandwidth polarization-maintaining fiber grating 3 and dichroic mirror 5, constantly vibrate and obtain repeatedly amplifying back and forth, oscillator signal light forms laser after breaking through threshold value, oscillating laser is respectively after the 3 coupling outputs of narrow bandwidth polarization-maintaining fiber grating in the chamber, be input to the front end of the polarization maintaining optical fibre isolator 6 of 1550nm via guarantor's partial wave division multiplexer WDM2 partial wave of 980/1550nm, and output is stable after isolating reflection or residual pump light by polarization maintaining optical fibre isolator 6, polarization keeps, the optical-fiber laser of single longitudinal mode, and the temperature of accurate control heat sink 7, help further realizing the stability of optical maser wavelength, realized that finally output wavelength is the low noise narrow-linewidth single frequency optical-fiber laser guarantor output partially of 1.5 μ m.
The polarization maintaining optical fibre 4 of high-gain rare earth doping phosphoric acid salt glass single mode is as the gain media of fiber laser, length can be selected according to the reflection spectrum width of device laser output power size and narrow-linewidth polarization-maintaining fiber grating 3, this example is 0.8cm, is generally 0.5～10cm and all can.The light emitting ionic of fibre core 9 doped with high concentration be ytterbium, the doping content of erbium/ytterbium rare earth ion is 7.5 * 10
20Ions/cm
3, generally be greater than 1 * 10
19Ions/cm
3Shown in Fig. 2 b, polarization maintaining optical fibre 4 cross section structures of rare earth doping phosphoric acid salt glass single mode are the panda type structures, and fibre core 9 is circular, and diameter is 8 μ m, being generally 1-10 μ m all can, two panda eyes, 10 symmetry arrangement, size are consistent, with fibre core 9 distances be 20-40 μ m, panda eye 10 is 15 μ m through size directly, general 10-20 μ m all can, covering 8 is circular, and diameter is 125 μ m, and general 125-400 μ m all can.The bat length of this polarization maintaining optical fibre is 5.6mm.Because Doping Phosphorus hydrochlorate glass monomode fiber is designed to polarization maintaining optical fibre 4, thereby has a higher extinction ratio, insensitive to bending and twisting stress simultaneously, help eliminating noise and the frequency drift that the single-frequency optical-fiber laser causes because of ambient vibration, thereby further improve the signal to noise ratio of laser, signal to noise ratio can reach 65dB.Fibre core 9 compositions of polarization maintaining optical fibre 4 are phosphate glass, and it consists of: 70P
2O
5-8Al
2O
3-15BaO-4La
2O
3-3Nd
2O
3Rare earth ion is uniform high-concentration dopant in fibre core 9.High-gain rare earth doping phosphoric acid salt glass single-mode polarization maintaining fiber 4 is to make prefabricated rods by boring method, rod-in-tube technique: earlier the cladding glass processed being become diameter is the glass bar of 25mm, getting out a diameter in this center glass rod position again is the 1.6mm circular hole, the inner surface of polished glass circular hole then, and then straight on two on panda eye 10 design attitudes brill through being the circular hole of 3mm, polish the inner surface of two circular holes equally; Secondly, it is the pole of 1.6mm that fibre core 9 glass processings are processed into a diameter, and then polishes this pole outer surface; Once more, processed Cheng Zhijing is two panda eye 10 poles of 3mm another kind of multicomponent glass material (its coefficient of expansion needs the coefficient of expansion greater than phosphate glass), polish the outer surface of this two pole, again fibre core 9 glass bars are inserted in the centre bore in covering 8 glass bars, article two, panda eye 10 pole glass poles are inserted into respectively in the panda eyelet in covering 8 glass bars, are assembled into a preform; At last, the preform that assembles be put in the fibre-optical drawing tower draw in the high temperature furnace, finally draw out have protect bias can rare earth doping phosphoric acid salt glass optical fiber 4.
Under the continuous excitation of pumping source, the fibre core 9 middle rare earth ions of the polarization maintaining optical fibre 4 of rare earth doping phosphoric acid salt glass single mode are realized population inversion, the flashlight of being excited to reflect is under the preceding Effect of Back-Cavity Mirror effect of being made of short F-P cavity configuration narrow bandwidth polarization-maintaining fiber grating 3 and dichroic mirror 5, constantly vibrate and obtain repeatedly amplifying back and forth, oscillator signal light forms laser after breaking through threshold value, oscillating laser is respectively after the 3 coupling outputs of narrow bandwidth polarization-maintaining fiber grating in the chamber, be input to the front end of the polarization maintaining optical fibre isolator 6 of 1060nm via guarantor's partial wave division multiplexer WDM2 partial wave of 980/1060nm, and output is stable after isolating reflection or residual pump light by polarization maintaining optical fibre isolator 6, polarization keeps, the optical-fiber laser of single longitudinal mode, and the temperature of accurate control heat sink 7, help further realizing the stability of optical maser wavelength, realized that finally output wavelength is the low noise narrow-linewidth single frequency optical-fiber laser guarantor output partially of 1.06 μ m.
Polarization maintaining optical fibre 4 length of high-gain rare earth doping phosphoric acid salt glass single mode are 10cm, and the light emitting ionic of fibre core 9 doped with high concentration is transition metal ions Cu
2+, Cu
2+Doping content be respectively 1.5 * 10
19Ions/cm
3Other is with embodiment 2.Equally, the light emitting ionic of fibre core 9 doped with high concentration is Co
2+, Cr
3+, Fe
2+Or Mn
2+Transition metal ions.
Claims (9)
1. high-power single-longitudinal-mode fiber laser of low noise narrow linewidth, its single mode semiconductor laser pumping source (1) is connected with the pumping input of protecting partial wave division multiplexer (2), the common port of guarantor's partial wave division multiplexer (2) is protected inclined to one side bragg grating (3) with narrow linewidth and is connected, narrow linewidth is protected inclined to one side bragg grating (3) and is connected with dichroic mirror (5) through polarization maintaining optical fibre (4), the signal end of protecting partial wave division multiplexer (2) is connected with polarization maintaining optical fibre isolator (6), and polarization maintaining optical fibre (4) and narrow linewidth are protected inclined to one side bragg grating (3) fixed sealing and be contained in heat sink (7) that automatic temperature-adjusting controls; It is characterized in that: described polarization maintaining optical fibre (4) is a rare earth doping phosphoric acid salt single mode glass optical fiber, and fibre core (9) composition is a phosphate glass, consists of 70P
2O
5-8Al
2O
3-15BaO-4La
2O
3-3Nd
2O
3, the light emitting ionic of fibre core (9) doped with high concentration of described polarization maintaining optical fibre (4), described light emitting ionic are one or more assembly in lanthanide ion, the transition metal ions, described light emitting ionic doping content is greater than 1 * 10
19Ions/cm
3, and in fibre core (9), be even doping.
2. the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth according to claim 1 is characterized in that: described polarization maintaining optical fibre (4) fibre core (9) is for oval, and axial ratio is 1.1-3.0, and minor axis is long to be 3-10 μ m, and covering (8) is circular.
3. the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth according to claim 1, it is characterized in that: described polarization maintaining optical fibre (4) is the panda type structure, fibre core (9) is circular, diameter is 3-10 μ m, two panda eyes (10) symmetry arrangement, size unanimity, with fibre core spacing from being 20-40 μ m, panda eye (10) is 10-20 μ m through size directly, covering (8) is circular.
4. according to claim 2 or the high-power single-longitudinal-mode fiber laser of 3 described low noise narrow linewidths, it is characterized in that: the bat of described polarization maintaining optical fibre (4) is grown up and is gained greater than 1dB/cm in 5mm, unit length, and fiber lengths is 0.5-5cm.
5. the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth according to claim 1, it is characterized in that: described dichroic mirror (5) is for plating film or being that directly the side end face behind polarization maintaining optical fibre (4) grinding and polishing plates film at cavity mirror face, described film to laser signal wavelength reflectivity greater than 90%, to the pumping wavelength transmissivity greater than 90%.
6. the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth according to claim 1, it is characterized in that: the foveal reflex wavelength that described narrow linewidth is protected inclined to one side bragg grating (3) is a laser output wavelength, 3dB reflection spectrum width is less than 0.1nm, and the centre wavelength reflectivity is 10-95%.
7. the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth according to claim 1 is characterized in that: the coupling between inclined to one side bragg grating of described guarantor (3) and the rare earth doping phosphoric acid salt glass polarization maintaining optical fibre (4) is by directly butt joint coupling behind its corresponding fiber end face of grinding and polishing.
8. the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth according to claim 1 is characterized in that: described lanthanide ion is Er
3+, Yb
3+, Tm
3+, Gd
3+, Tb
3+, Dy
3+, Ho
3+Or Lu
3+
9. the high-power single-longitudinal-mode fiber laser of low noise narrow linewidth according to claim 1 is characterized in that: described transition metal ions is Cu
2+, Co
2+, Cr
3+, Fe
2+Or Mn
2+
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