CN1972035A - A linear resonant cavity wide narrow line tunable optical fiber laser - Google Patents
A linear resonant cavity wide narrow line tunable optical fiber laser Download PDFInfo
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- CN1972035A CN1972035A CN 200610165118 CN200610165118A CN1972035A CN 1972035 A CN1972035 A CN 1972035A CN 200610165118 CN200610165118 CN 200610165118 CN 200610165118 A CN200610165118 A CN 200610165118A CN 1972035 A CN1972035 A CN 1972035A
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Abstract
This invention discloses one linear resonance thin thread width atonable fiber laser, wherein, the pump light source enters from multiplex C end to first mixture fiber through fiber multiplex A end; the first mixture fiber is to absorb pump light to generate fluorescence light along R direction for fiber multiplex A end and L direction for Faraday reflection lens.
Description
Technical field
The present invention relates to a kind of fiber laser, more particularly say, be meant a kind of wide narrow line tunable optical fiber laser that can keep laser output frequency to stablize and avoid effects of spatial.
Background technology
Fiber laser is to grow up on the technical foundation of image intensifer, similar with image intensifer, its gain media is that one section doped fiber and corresponding device are combined into an active resonant cavity, generally is the output that realizes laser under the pumping of semiconductor laser.It has unique advantage as a kind of novel light source: optical fiber output is used flexibly, can under rugged environment, work, compact conformation, the energy density height, anti-electromagnetic interference is strong, pumping threshold is low, the conversion efficiency height, tunable range is wide, need not to add heat radiation or the like, especially can obtain the output of optical fiber communication C-band easily, and with the natural coupling of fibre system.Fiber laser is applicable to fields such as high-end test, sensing.
In some noncontacts, in the big optical path difference coherent optical-fiber sensing measurement, because traditional fiber laser linewidth broad, embodying the light source phase noise that does not come out when short distance detection becomes one of important source of noise, has caused the rapid reduction of interference system signal to noise ratio thus.
Because fiber laser typical cavity length can reach tens meters, so longitudinal mode spacing is very narrow, and whole gain region is very wide, and this has brought very big difficulty to modeling.If only adopt general filter such as fiber grating or F-P interferometer, laser generally will be in irregular many longitudinal modes operating condition.A solution is that the shortening chamber is long, and chamber length can shorten to the submillimeter magnitude, thereby realizes single longitudinal mode output.Though said method can obtain single longitudinal mode output, can reduce laser output power, and its tuning range can not be too wide.
As far back as 1845, faraday (M.Faraday) finds experimentally, when a branch of linearly polarized light during by non-optical activity medium, if in medium along adding an external magnetic field on the optical propagation direction, then light is by behind the medium, the vibration plane of light vibration (referring to electric vector) turns over an angle θ, and the phenomenon that this externally-applied magnetic field makes medium produce optical activity is called Faraday effect or magnetic rotation effect.The simplicity of explanation of Faraday effect is: linearly polarized light always can be decomposed into left-handed and two circularly polarized lights dextrorotation, during no external magnetic field, medium has identical refractive index and propagation velocity to these two kinds of circularly polarized lights, behind the medium by the L distance, every kind of circularly polarized light has been caused identical phase shift, and the vibration plane that therefore sees through after medium superposes does not deflect; When external magnetic field exists, owing to the interaction of magnetic field and material, changed the light characteristic of material, at this moment medium shows different refractive indexes and propagation velocity to dextrorotation and left circularly polarized light.By having caused different phase shift after the same distance, rotation has taken place with respect to the vibration plane of incident light in the vibration plane after the stack in medium for the two.Faraday effect is found back more than 100 year, does not obtain to use, and up to the sixties in 20th century, because the rise of laser and photoelectron technology, Faraday effect just finds a place where one can give full play to one's talent.Optical fiber faraday speculum is based on the optics that Faraday effect is made.Its effect is to change the polarization of incident light attitude, makes the polarization of reflected light attitude compare with the polarization of incident light attitude, has just in time rotated 90 degree, therefore can avoid incident light and catoptrical stack, thereby avoid effects of spatial.
Summary of the invention
The purpose of this invention is to provide a kind of linear resonant cavity narrow line width regulatable fiber laser, this wide narrow line tunable optical fiber laser gain part is a linear resonant cavity.Because effects of spatial has effectively been avoided in the use of faraday's speculum, has guaranteed the long-term stability of laser output frequency; Employing is one section dopant ion optical fiber of welding between Polarization Controller and coupler, the narrow-band filtering characteristic that writes fiber grating certainly of utilizing the saturated absorption effect of light in dopant ion optical fiber to bring out, and this from the adaptive characteristic that writes the fiber grating reflection wavelength, realized the output of single longitudinal mode narrow-linewidth laser.
A kind of linear resonant cavity wide narrow line tunable optical fiber laser of the present invention, the pump light of pump light source output enters through the C of optical fibre wavelength division multiplexer end, be transferred to first doped fiber through the A of optical fibre wavelength division multiplexer end, can produce fluorescence behind the first doped fiber absorptive pumping light, described fluorescence transmits to R direction and L direction in first doped fiber, wherein, L direction fluorescence is exported to faraday's speculum, and R direction fluorescence is exported to the A end of optical fibre wavelength division multiplexer; L direction fluorescence is reflected on faraday's speculum, and the back forms and the reverberation of incident light polarization state quadrature, described reverberation and R direction fluorescence are exported to the Fabry Perot tunable optic filter through the D of first doped fiber, optical fibre wavelength division multiplexer end, enter the A end of first coupler afterwards; D end output laser by first coupler; C by first coupler holds the laser that transfers out to carry out the A end of second coupler, and the clockwise light of the C end transmission of second coupler enters the D end of second coupler behind Polarization Controller, second doped fiber; The counterclockwise light of the D end transmission of second coupler enters the C end of second coupler behind second doped fiber, Polarization Controller; The described laser that enters from the C end and the D end of second coupler is exported to the C end of first coupler from the A end of second coupler, export to the Fabry Perot tunable optic filter from the A end of first coupler, D end from optical fibre wavelength division multiplexer enters afterwards, exports to first doped fiber from the A end.Repeat above-mentioned vibration, laser is from the D end output of first coupler.
Described wide narrow line tunable optical fiber laser, its second coupler, Polarization Controller and second doped fiber be common forms an Active Optical Fiber annular chamber, plays the effect of speculum, and what produce a transient state in second doped fiber writes fiber grating certainly.
Described wide narrow line tunable optical fiber laser, its optical fibre wavelength division multiplexer, first doped fiber, faraday's speculum, second coupler, first coupler and Fabry Perot tunable optic filter form linear resonant cavity.
The use of optical fiber Fabry pool sieve tunable optic filter makes the laser output wavelength of fiber laser of the present invention to regulate more than the 100nm continuously.
The advantage of wide tunable fiber laser of the present invention is: the selecting for use of (1) faraday's speculum 4 avoided the effects of spatial that very easily occurs in the linear resonant cavity effectively, makes the excellent stability of laser output frequency; (2) second couplers 5, Polarization Controller 6 and speculum of second doped fiber, 7 common compositions make the laser output linewidth may be compressed to several KHz; (3) at the D of optical fibre wavelength division multiplexer 2 end welding optic fibre Fabry pool sieve tunable optic filter 9, make the adjustable range of laser output wavelength reach more than the 100nm.
Description of drawings
Fig. 1 is the overall structure schematic diagram of linear resonant cavity wide narrow line tunable optical fiber laser of the present invention.
Among the figure: 1. pump light source 2. optical fibre wavelength division multiplexers 3. first doped fibers 4. faraday's speculums 5. second couplers 6. Polarization Controllers 7. second doped fibers 8. first couplers 9. optical fiber Fabries are moored sieve tunable optic filter
Embodiment
The invention discloses a kind of novel optical fiber laser, realized the function that wide tunable, single longitudinal mode narrow-linewidth laser are exported with simple structure.
See also shown in Figure 1, the present invention is a kind of linear resonant cavity wide narrow line tunable optical fiber laser, pump light source 1 welding is on the C of optical fibre wavelength division multiplexer 2 end, the A end and the 3 one end weldings of first doped fiber of optical fibre wavelength division multiplexer 2, first doped fiber, 3 other ends and 4 weldings of faraday's speculum, D end and optical fiber Fabry-pool sieve tunable optic filter 9 one end weldings of optical fibre wavelength division multiplexer 2, the A end welding of optical fiber Fabry-pool sieve tunable optic filter 9 other ends and first coupler 8, the C end of first coupler 8 is held welding with the A of second coupler 5, the C end and the 7 one end weldings of second doped fiber of second coupler 5, the D end and 7 other end weldings of second doped fiber of second coupler 5, Polarization Controller 6 weldings are on second doped fiber 7.
See also shown in Figure 1ly, the present invention is a kind of linear resonant cavity wide narrow line tunable optical fiber laser, and pump light source 1 can adopt the 974nm semiconductor laser, also can be the semiconductor laser of wavelength 1480nm; The pump light of pump light source 1 output enters through the C of optical fibre wavelength division multiplexer 2 end, be transferred to first doped fiber 3 through the A of optical fibre wavelength division multiplexer 2 end, can produce fluorescence behind first doped fiber, the 3 absorptive pumping light, described fluorescence transmits to R direction and L direction in first doped fiber 3, wherein, L direction fluorescence is exported to faraday's speculum 4, and R direction fluorescence is exported to the A end of optical fibre wavelength division multiplexer 2; L direction fluorescence is reflected on faraday's speculum 4, and the back forms and the reverberation (being laser) of incident light polarization state quadrature, and described reverberation is exported to optical fiber Fabry-pool sieve tunable optic filter 9 through the D of first doped fiber 3, optical fibre wavelength division multiplexer 2 end; Enter the A end of first coupler 8 through the described reverberation that transfers out of optical fiber Fabry-pool sieve tunable optic filter 9, the described reverberation in first coupler 8 (being laser) is by its D end outgoing laser beam; The described reverberation that is transferred out by the C of first coupler 8 end enters the A end of second coupler 5, is entered the D end of second coupler 5 behind Polarization Controller 6, second doped fiber 7 by the clockwise light of the C end transmission of second coupler 5; The counterclockwise light of the D end transmission of second coupler 5 enters the C end of second coupler 5 behind second doped fiber 7, Polarization Controller 6, suitable, the contrary two-beam in second coupler 5 is transferred to the C end of first coupler 8 once more through the A end; Hold the laser that enters to export to the C end of first coupler 8 from the A end of second coupler 5 from the C end and the D of second coupler 5, export to Fabry Perot tunable optic filter 9 from the A end of first coupler 8, D end from optical fibre wavelength division multiplexer 2 enters afterwards, exports to first doped fiber 3 from the A end.Repeat above-mentioned vibration, laser is from the D end output of first coupler 8.In the present invention, described second coupler 5, Polarization Controller 6 and second doped fiber 7 be common forms an Active Optical Fiber annular chamber, plays the effect of speculum, and what produce a transient state in second doped fiber 7 writes fiber grating certainly.Light forms one from writing fiber grating in second doped fiber 7, second doped fiber 7 is dopant ion optical fiber in the pumping optical fiber not, the narrow-band filtering characteristic that writes fiber grating certainly that light brings out owing to the saturated absorption effect in second doped fiber 7, and this has realized the output of single longitudinal mode narrow-linewidth laser from the adaptive characteristic that writes the reflection wavelength of fiber grating.This from writing the effect that fiber grating plays compression live width and stable single longitudinal mode laser output frequency.In the present invention, optical fibre wavelength division multiplexer 2, first doped fiber 3, faraday's speculum 4, second coupler 5, first coupler 8 and optical fiber Fabry-pool sieve tunable optic filter 9 forms linear resonant cavity, owing to adopted faraday's speculum 4, avoided the effects of spatial that very easily occurs in the linear resonant cavity in the described linear resonant cavity.
The basic principle that fiber grating works that writes certainly that forms in second doped fiber 7 is: there is not absorption in the rare earth doped particle of pumping to the laser that produces, when two-beam (by second coupler 5, Polarization Controller 6 and second doped fiber, the 7 common clockwise light of forming in the speculum, counterclockwise light) in 7 stacks of second doped fiber, when constituting standing wave, because antinode is different with the light intensity at node place, produce the saturated absorption phenomenon, (the promptly strong more absorption loss that laser had is more little to play the effect of saturable absorber, this effect helps suppressing the competition of back starting of oscillation pattern, thereby can be used for compressing the spectral width of operation laser).Absorb saturation effect make pumping doped fiber not to the absorption coefficient of flashlight with the length cyclic variation, therefore formed and write fiber grating certainly.This writes longitudinal mode other longitudinal mode in addition that fiber grating can suppress to form standing wave certainly, thereby has suppressed many longitudinal modes vibrations of laser.When being of convenient length, luminous power and second doped fiber 7 form from writing fiber grating, and this from the smaller bandwidth that writes fiber grating, therefore can play the compression live width and realize stablize the effect that single longitudinal mode laser is exported.
Among the present invention, first doped fiber 3, second doped fiber 7 are the optical fiber of doping element of the same race, and the dopant ion in the optical fiber is a rare earth element, can be er-doped, mixes ytterbium, neodymium-doped etc.
Utilization of the present invention at linear cavity resonator structure and the narrow-band filtering characteristic that writes fiber grating certainly that the saturated absorption effect of dopant ion is not brought out in the pumping optical fiber and this realized the output of single longitudinal mode narrow-linewidth laser from the adaptive characteristic that writes the fiber grating reflection wavelength; By in linear resonant cavity, adding faraday's speculum, make that the polarization state of light and the polarization of reflected light attitude that incide faraday's speculum are mutually orthogonal, incident light and reverberation can not superpose, therefore effectively avoided effects of spatial, suppressed the competition between many longitudinal modes, made that output laser is single longitudinal mode laser.
Claims (5)
1, a kind of linear resonant cavity wide narrow line tunable optical fiber laser, comprise pump light source, coupler, wavelength division multiplexer, it is characterized in that: the pump light of pump light source (1) output enters through the C of optical fibre wavelength division multiplexer (2) end, be transferred to first doped fiber (3) through the A of optical fibre wavelength division multiplexer (2) end, can produce fluorescence behind first doped fiber (3) the absorptive pumping light, described fluorescence transmits to R direction and L direction in first doped fiber (3), wherein, L direction fluorescence is exported to faraday's speculum (4), and R direction fluorescence is exported to the A end of optical fibre wavelength division multiplexer (2); L direction fluorescence is reflected on faraday's speculum (4), and the back forms and the reverberation of incident light polarization state quadrature, described reverberation and R direction fluorescence are exported to Fabry Perot tunable optic filter (9) through the D of first doped fiber (3), optical fibre wavelength division multiplexer (2) end, enter the A end of first coupler (8) afterwards; D end by first coupler (8) transfers out laser; The laser that is transferred out by the C of first coupler (8) end enters the A end of second coupler (5), is entered the D end of second coupler (5) behind Polarization Controller (6), second doped fiber (7) by the clockwise light of the C end transmission of second coupler (5); The counterclockwise light of the D end transmission of second coupler (5) enters the C end of second coupler (5) behind second doped fiber (7), Polarization Controller (6); The described laser that enters from the C end and the D end of second coupler (5) is exported to the C end of first coupler (8) from the A end of second coupler (5), and export to Fabry one through the A of first coupler (8) end and moor sieve tunable optic filter (9), D end from optical fibre wavelength division multiplexer (2) enters afterwards, exports to first doped fiber (3) from its A end.
2, wide narrow line tunable optical fiber laser according to claim 1, it is characterized in that: described second coupler (5), Polarization Controller (6) and second doped fiber (7) are formed an Active Optical Fiber annular chamber jointly, play the effect of speculum, what produce a transient state in second doped fiber (7) writes fiber grating certainly.
3, wide narrow line tunable optical fiber laser according to claim 1 is characterized in that: described optical fibre wavelength division multiplexer (2), first doped fiber (3), faraday's speculum (4), second coupler (5), first coupler (8) and Fabry Perot tunable optic filter (9) form linear resonant cavity.
4, wide narrow line tunable optical fiber laser according to claim 1 is characterized in that: described pump light source (1) is to adopt the 974nm semiconductor laser, or the semiconductor laser of wavelength 1480nm.
5, wide narrow line tunable optical fiber laser according to claim 1 is characterized in that: described first doped fiber (3), second doped fiber (7) are the doped fibers of the same rare earth element of doping in the optical fiber.
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| CNB2006101651185A CN100423385C (en) | 2006-12-13 | 2006-12-13 | A linear resonant cavity wide narrow line tunable optical fiber laser |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101859974A (en) * | 2010-06-12 | 2010-10-13 | 徐州师范大学 | Narrow linewidth thulium-doped fiber laser |
| CN102035129A (en) * | 2010-10-27 | 2011-04-27 | 中国科学院半导体研究所 | Wavelength-tunable laser source |
| CN102315581A (en) * | 2011-07-25 | 2012-01-11 | 武汉长盈通光电技术有限公司 | Er-doped full-solid photon band gap optical fiber power supply with high average wavelength stability |
| WO2012048665A1 (en) * | 2010-10-15 | 2012-04-19 | Huawei Technologies Co., Ltd. | A method, apparatus, and system for a self-seeded external cavity laser for dense wavelength division multiplexing applications |
| CN107248692A (en) * | 2017-05-19 | 2017-10-13 | 武汉理工大学 | A kind of compound cavity optical fibre laser of super-narrow line width Wavelength tunable |
| CN109787074A (en) * | 2019-03-12 | 2019-05-21 | 北京邮电大学 | A kind of single mode narrow linewidth optical fiber laser based on double fiber coupling rings and saturated absorbing body |
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| CN102305771B (en) | 2011-08-18 | 2012-12-12 | 天津大学 | Multi-waveband aliasing lumen gas sensing system and sensing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10117031A (en) * | 1996-10-14 | 1998-05-06 | Furukawa Electric Co Ltd:The | Optical amplifier |
| CN1099740C (en) * | 1998-12-30 | 2003-01-22 | 中国科学院西安光学精密机械研究所 | Multi-port coupled output femtosecond fiber laser |
| JP2001033349A (en) * | 1999-07-22 | 2001-02-09 | Advantest Corp | Light pulse generator |
| CN1276558C (en) * | 2003-11-21 | 2006-09-20 | 南开大学 | Single-double wave convertible wavelength location and interval adjustable erbium doped fibre-optical laser |
| CN1279664C (en) * | 2004-10-19 | 2006-10-11 | 中国科学院上海光学精密机械研究所 | Tunable single longitudinal mode optical fiber laser for eliminating beat frequency noise |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859974A (en) * | 2010-06-12 | 2010-10-13 | 徐州师范大学 | Narrow linewidth thulium-doped fiber laser |
| WO2012048665A1 (en) * | 2010-10-15 | 2012-04-19 | Huawei Technologies Co., Ltd. | A method, apparatus, and system for a self-seeded external cavity laser for dense wavelength division multiplexing applications |
| US8774630B2 (en) | 2010-10-15 | 2014-07-08 | Futurewei Technologies, Inc. | Method, apparatus, and system for a self-seeded external cavity laser for dense wavelength division multiplexing applications |
| CN102035129A (en) * | 2010-10-27 | 2011-04-27 | 中国科学院半导体研究所 | Wavelength-tunable laser source |
| CN102315581A (en) * | 2011-07-25 | 2012-01-11 | 武汉长盈通光电技术有限公司 | Er-doped full-solid photon band gap optical fiber power supply with high average wavelength stability |
| CN107248692A (en) * | 2017-05-19 | 2017-10-13 | 武汉理工大学 | A kind of compound cavity optical fibre laser of super-narrow line width Wavelength tunable |
| CN107248692B (en) * | 2017-05-19 | 2020-01-14 | 武汉理工大学 | Ultra-narrow linewidth wavelength-adjustable composite cavity optical fiber laser |
| CN109787074A (en) * | 2019-03-12 | 2019-05-21 | 北京邮电大学 | A kind of single mode narrow linewidth optical fiber laser based on double fiber coupling rings and saturated absorbing body |
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