CN103746280A - Long resonant cavity all-fiber single-frequency laser device - Google Patents
Long resonant cavity all-fiber single-frequency laser device Download PDFInfo
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Abstract
The invention discloses a long resonant cavity all-fiber single-frequency laser device, and belongs to the fields of laser technology and nonlinear optics. The long resonant cavity all-fiber single-frequency laser device mainly comprises a pumping source, an optical fiber beam combiner, a wavelength division multiplexing device, a gain optical fiber, a reflection-type optical fiber Bragg grating, an optical isolator, a total reflection mirror, a circulator, a filter and a beam splitter. The gain optical fiber with highly doped rare earth elements is utilized to act as a gain medium and an ultra-short resonant cavity is adopted to act as an F-P cavity so that characteristics of being single-frequency, all-fiber in structure, high in stability, high in power, high in energy and high in efficiency are realized. Compared with conventional ultra-short cavity structures, such as distributed feed back (DFB) and distributed reflection (DBR), the long resonant cavity all-fiber single-frequency laser device is simple and compact in design structure, great in stability and high in output power.
Description
Technical field
The invention discloses the fine single frequency laser of a kind of long resonant cavity all-optical, belong to laser technology and non-linear optical field.
Background technology
Volume is little, cost is low owing to having for fiber laser, good beam quality, efficiency advantages of higher, in fields such as communication, medical science, biology and radars, has extensive and important application, has become the important a member in laser family.Particularly single frequency optical fiber laser, because of characteristics such as its line width, low noise, anti-electromagnetic interference, is widely used in the fields such as optical fiber communication, Fibre Optical Sensor, optical fiber remote sensing, material technology and high accuracy spectrum.
For the generation of single frequency optical fiber laser, mainly contain two kinds of methods: short transmission lines die cavity fiber laser and the circular cavity optic fibre laser with arrowband frequency-selecting device.The former mainly contains two types of distributed reflection (DBR) and distributed Feedback (DFB).DFB structure: the two ends of high-gain Active Optical Fiber are connected to a pair of fiber grating, and in order to realize the output of low noise single-frequency, gain Active Optical Fiber generally only has several cm long.DFB structure: resonant cavity is directly scribed on Active Optical Fiber, and because the gain of Active Optical Fiber is lower, so power output is limited, but this structure output stability is higher.Annular chamber single frequency optical fiber laser: add the filter of an arrowband to realize single-frequency output in annular chamber, because the active fine length adopting in this structure is longer, this can cause laserfrequencystability variation, easily occurs Mode-hopping Phenomena.
Summary of the invention
For the single-frequency laser technology that adopts ultrashort linear cavity, no matter be distributed reflection (DBR) or distributed Feedback (DFB) any mode wherein, owing to adopting ultrashort structure, gain fibre length requirement is very short, this doping for gain fibre requires very high, the single-frequency laser output of restriction different wave length, and power output is very low, in order to realize high-power single-frequency output, just must break away from the short restriction of gain fibre, but for the annular chamber scheme that adopts long gain fibre, the single-frequency output that the long very difficult assurance of gain fibre is stable, easily there is Mode-hopping Phenomena.The present invention adopts a kind of long resonant cavity scheme based on rare earth doped fiber and Fiber Bragg Grating FBG, realizes full fiberize, high stability, high power, the high efficiency of high power single frequency laser, the single-frequency laser output of compact conformation.
For achieving the above object, the technical solution used in the present invention is the fine main pumping of single frequency laser of a kind of long resonant cavity all-optical and relevant apparatus, laserresonator, gain fibre, laser output device and other servicing unit composition.
Laserresonator can be linearity or loop configuration; The resonant cavity of whole laser is divided into resonant cavity I resonant cavity II two parts, the exocoel that wherein resonant cavity I is laser, the inner chamber that resonant cavity II is laser; Resonant cavity I is comprised of linear resonant cavity or ring resonator; Resonant cavity II is to form the F-P chamber with filter action by two Fiber Bragg Grating FBGs, and two Fiber Bragg Grating FBGs are middle without gain fibre or optical-fiber bundling device or wavelength-division recombiner device; Between resonant cavity I and resonant cavity II, can be furnished with gain fibre or optical-fiber bundling device or wavelength-division recombiner device; First pump light is injected in the gain fibre of resonant cavity I, and the laser of generation enters in resonant cavity II, by the filter action of resonant cavity II, filtered light is fed back in resonant cavity I and is vibrated, finally in long resonant cavity, realizes stable single-frequency output.
Pumping and relevant apparatus comprise pumping source, optical-fiber bundling device or wavelength division multiplexer; Laserresonator comprises that reflection-type optical fiber Bragg grating comprises the first reflection-type optical fiber Bragg grating, the second reflection-type optical fiber Bragg grating, the 3rd reflection-type optical fiber Bragg grating, the 4th reflection-type optical fiber Bragg grating or total reflective mirror.
Gain fibre in resonant cavity comprises the first gain fibre, the second gain fibre; The first gain fibre or the first gain fibre and the second gain fibre are placed in resonant cavity I; Laser output device comprises optical isolator, circulator or beam splitter; Other servicing unit is filter.
When resonant cavity is linear structure, the first reflection-type optical fiber Bragg grating and the second reflection-type optical fiber Bragg grating form resonant cavity II; The 3rd reflection-type optical fiber Bragg grating, the 4th reflection-type optical fiber Bragg grating, the first gain fibre and the second gain fibre form resonant cavity I; Or the second reflection-type optical fiber Bragg grating, the 3rd reflection-type optical fiber Bragg grating in resonant cavity can replace the public speculum as resonant cavity I resonant cavity II by total reflective mirror.
When resonant cavity is loop configuration, the first gain fibre, the 3rd reflection-type bragg grating, wavelength division multiplexer and circulator or beam splitter composition annular chamber, i.e. resonant cavity I; The first reflection-type optical fiber Bragg grating and the second reflection-type optical fiber Bragg grating form resonant cavity II.
Pumping source produces pump light, by optical-fiber bundling device or wavelength division multiplexer, be coupled in resonant cavity I, the laser that resonant cavity I produces enters resonant cavity II again, because resonant cavity II has the effect of filtering, by the filtered light of resonant cavity II, feed back to again resonant cavity I, through the vibration of resonant cavity I, the final long chamber single-frequency laser of realizing is exported.
Described pumping source is semiconductor laser, solid state laser, gas laser, fiber laser or Raman laser, and the scope of the central wavelength lambda of output pump light is 700nm≤λ≤2000nm.
Described the first gain fibre, the second gain fibre are optical fiber or the photonic crystal fibers that is mixed with rare earth element, and wherein the rare earth element of doping is one or more in ytterbium (Yb), erbium (Er), holmium (Ho), thulium (Tm), neodymium (Nd), chromium (Cr), samarium (Sm), bismuth (Bi).
The reflectivity of described the first reflection-type optical fiber Bragg grating, the second reflection-type optical fiber Bragg grating, the 3rd reflection-type optical fiber Bragg grating, the 4th reflection-type optical fiber Bragg grating and total reflective mirror is R, wherein 0<R<1.
Described pump mode is single-ended, the both-end pumping of fibre core or covering.
Described optical-fiber bundling device is (2+1) x1 or (6+1) bundling device.
Compared with prior art, the present invention has following beneficial effect.
1, the present invention utilizes ultrashort linear resonant cavity, and the laser of exocoel is carried out to modeling, and light is fed back to exocoel as seed light, has realized the single-frequency laser output of high power, high stability.
2, the present invention utilizes exocoel to produce laser, and feedback is selected and provided to inner chamber to the laser in chamber, and this design can be broken away from the restriction of gain fibre length, realizes different wave length, high power, stable single-frequency laser output.
3, simplicity of design of the present invention, compact conformation, simultaneously can high, the high-power single-frequency laser of output stability, is easy to realize industrialization.
Accompanying drawing explanation
Fig. 1 is the fine single frequency laser basic principle of long resonant cavity all-optical figure.
Fig. 2 is the schematic diagram of resonant cavity while being linear structure.
Fig. 3 is the schematic diagram of resonant cavity while being loop configuration.
Schematic diagram when Fig. 4 is total reflective mirror replacement reflection-type optical fiber Bragg grating.
Fig. 5 is the fine single frequency laser work of the long resonant cavity all-optical of embodiment 1 schematic diagram.
Fig. 6 is the fine single frequency laser work of the long resonant cavity all-optical of embodiment 2 schematic diagram.
Fig. 7 is the fine single frequency laser work of the long resonant cavity all-optical of embodiment 3 schematic diagram.
In figure: 1, pumping source, 2, optical-fiber bundling device, 3, the first gain fibre, 4, the second gain fibre, 5, the first reflection-type optical fiber Bragg grating, 6, the second reflection-type optical fiber Bragg grating, 7, the 3rd reflection-type optical fiber Bragg grating, 8, the 4th reflection-type optical fiber Bragg grating, 9, optical isolator, 10, total reflective mirror, 11, circulator, 12, filter, 13, beam splitter, 14, wavelength division multiplexer.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is described in further detail.
As Figure 1-4, the fine single frequency laser of a kind of long resonant cavity all-optical, this laser comprises pumping and relevant apparatus, laserresonator, gain fibre, laser output device and other servicing unit.
Laserresonator can be linearity or loop configuration; The resonant cavity of whole laser is divided into resonant cavity I resonant cavity II two parts, the exocoel that wherein resonant cavity I is laser, the inner chamber that resonant cavity II is laser; Resonant cavity I is comprised of linear resonant cavity or ring resonator; Resonant cavity II is to form the F-P chamber with filter action by two Fiber Bragg Grating FBGs, and two Fiber Bragg Grating FBGs are middle without gain fibre or optical-fiber bundling device or wavelength-division recombiner device; Between resonant cavity I and resonant cavity II, can be furnished with gain fibre or optical-fiber bundling device or wavelength-division recombiner device; First pump light is injected in the gain fibre of resonant cavity I, and the laser of generation enters in resonant cavity II, by the filter action of resonant cavity II, filtered light is fed back in resonant cavity I and is vibrated, finally in long resonant cavity, realizes stable single-frequency output.
Pumping and relevant apparatus comprise pumping source 1, optical-fiber bundling device 2 or wavelength division multiplexer 14; Laserresonator comprises that reflection-type optical fiber Bragg grating comprises the first reflection-type optical fiber Bragg grating 5, the second reflection-type optical fiber Bragg grating 6, the 3rd reflection-type optical fiber Bragg grating 7, the 4th reflection-type optical fiber Bragg grating 8 or total reflective mirror 10.
Gain fibre in resonant cavity comprises the first gain fibre 3, the second gain fibre 4; The first gain fibre 3 or the first gain fibre 3, the second gain fibre 4 are placed in resonant cavity I; Laser output device comprises optical isolator 9, circulator 11 or beam splitter 13; Other servicing unit is filter 12.
When resonant cavity is linear structure, the first reflection-type optical fiber Bragg grating 5 and the second reflection-type optical fiber Bragg grating 6 form resonant cavity II; The 3rd reflection-type optical fiber Bragg grating 7, the 4th reflection-type optical fiber Bragg grating 8, the first gain fibre 3 and the second gain fibre 4 form resonant cavity I; Or the second reflection-type optical fiber Bragg grating 6 in resonant cavity, the 3rd reflection-type optical fiber Bragg grating 7 can replace the public speculum as resonant cavity I resonant cavity II by total reflective mirror 10.
When resonant cavity is loop configuration, the first gain fibre 3, the 3rd reflection-type bragg grating 7, wavelength division multiplexer 14 and circulator 11 or beam splitter 13 form annular chamber, i.e. resonant cavity I; The first reflection-type optical fiber Bragg grating 5 and the second reflection-type optical fiber Bragg grating 6 form resonant cavity II.
Described pumping source 1 is semiconductor laser, solid state laser, gas laser, fiber laser or Raman laser, and the scope of the central wavelength lambda of output pump light is 700nm≤λ≤2000nm.
Described the first gain fibre 3, the second gain fibre 4 are optical fiber or the photonic crystal fibers that are mixed with rare earth element, and wherein the rare earth element of doping is one or more in ytterbium (Yb), erbium (Er), holmium (Ho), thulium (Tm), neodymium (Nd), chromium (Cr), samarium (Sm), bismuth (Bi).
The reflectivity of described the first reflection-type optical fiber Bragg grating 5, the second reflection-type optical fiber Bragg grating 6, the 3rd reflection-type optical fiber Bragg grating 7, the 4th reflection-type optical fiber Bragg grating 8 and total reflective mirror 10 is R, wherein 0<R<1.
Described pump mode is single-ended, the both-end pumping of fibre core or covering.
Described optical-fiber bundling device 2 is (2+1) x1 or (6+1) bundling device.
As shown in Figure 5.In figure, to select centre wavelength be the semiconductor laser diode of 976nm to pumping source 1; Optical-fiber bundling device 2(or wavelength division multiplexer 14) select (2+1) × 1 pump signal bundling device, as 6/125 type or 20/125 type; The first gain fibre 3, the second gain fibre 4 are rare earth doped fibers, the high-performance Yb dosed optical fiber that can select U.S. Nufern company to produce; The first reflection-type optical fiber Bragg grating 5, the second reflection-type optical fiber Bragg grating 6, the 3rd reflection-type optical fiber Bragg grating 7, the 4th reflection-type optical fiber Bragg grating 8 are reflection-type optical fiber Bragg gratings, optional high transoid and part reflection-type grating, reflectivity is R, wherein 0<R<1; Optical isolator 9 is polarization independent optical isolator.
Pump light is by optical-fiber bundling device 2(or wavelength division multiplexer 14) pumping end enter into the first gain fibre 3, then by the second gain fibre 4 and the first reflection-type optical fiber Bragg grating 5, the second reflection-type optical fiber Bragg grating 6, arrive the 4th reflection-type optical fiber Bragg grating 8, the light reflecting is again through the first gain fibre 3, the second gain fibre 4 and the first reflection-type optical fiber Bragg grating 5, the second reflection-type optical fiber Bragg grating 6, arrive the 3rd reflection-type optical fiber Bragg grating 7, this reflection-type optical fiber Bragg grating is high transoid grating, be reflectivity R, R >=99%, the nearly all light of this central wavelength can be reflected back, the 3rd reflection-type optical fiber Bragg grating 7, the 4th reflection-type optical fiber Bragg grating 8 forms resonant cavity I, the laser that resonant cavity I produces forms ultrashort resonant cavity II by the first reflection-type optical fiber Bragg grating 5, the second reflection-type optical fiber Bragg grating 6, the laser that resonant cavity I is produced carries out filtering and feedback, form high power single frequency laser, through output after optical isolator 9.Embodiment 2
As shown in Figure 6, in figure pumping source 1 to select centre wavelength be the semiconductor laser diode of 976nm; Optical-fiber bundling device 2(or wavelength division multiplexer 14), can select (2+1) × 1 pump signal bundling device, as 6/125 type or 20/125 type; The first gain fibre 3 is rare earth doped fibers, the high-performance Yb dosed optical fiber that can select U.S. Nufern company to produce; The first reflection-type optical fiber Bragg grating 5, the 4th reflection-type optical fiber Bragg grating 8 are reflection-type optical fiber Bragg gratings, optional low transoid and high transoid grating, and reflectivity is R, wherein 0<R<1; Optical isolator 9 is polarization independent optical isolator, and total reflective mirror 10 is golden mirror.
Pump light is by optical-fiber bundling device 2(or wavelength division multiplexer 14) pumping end enter, by the first gain fibre 3, arrive the 4th reflection-type optical fiber Bragg grating 8, the light reflecting reaches total reflective mirror 10 through the first gain fibre 3 and the first reflection-type optical fiber Bragg grating 5, this total reflective mirror is golden mirror, and its reflectivity is R, R >=99%, nearly all light can be reflected back, and the 4th reflection-type optical fiber Bragg grating 8 and total reflective mirror 10 form resonant cavity I.The laser that resonant cavity I produces is by the first reflection-type optical fiber Bragg grating 5, then arrive total reflective mirror 10, the first reflection-type optical fiber Bragg grating 5 and total reflective mirror 10 form ultrashort resonant cavity II, the laser that resonant cavity I is produced carries out filtering and feedback, form high power single frequency laser, through output after optical isolator 9.
As shown in Figure 7, to select centre wavelength be the semiconductor laser diode of 976nm to pumping source 1; Optical-fiber bundling device 2 is selected (2+1) × 1 pump signal bundling device, as 6/125 type or 20/125 type; The first gain fibre 3 is rare earth doped fibers, the high-performance Yb dosed optical fiber that optional U.S. Nufern company produces; The first reflection-type optical fiber Bragg grating 5, the second reflection-type optical fiber Bragg grating 6, the 3rd reflection-type optical fiber Bragg grating 7 are reflection-type optical fiber Bragg gratings, optional high transoid and part reflection-type grating, reflectivity is R, wherein 0<R<1; The 9th, optical isolator, optional polarization independent optical isolator; The 12nd, filter, optional 1um wave band narrow band filter; Optional 980/1060 wavelength division multiplexer of wavelength division multiplexer 14.
Pump light enters into the first gain fibre 3 by the pumping end of optical-fiber bundling device 2, after filter 12 filtering, arrive wavelength division multiplexer 14, outside 1060 end output cavities, in defeated time chamber of 980 ends, by reflection-type first, two reflection-type optical fiber Bragg gratings 5, 6, through optical isolator 9, from optical-fiber bundling device 2 signal ends, return to formation annular chamber-resonant cavity I, first, two reflection-type optical fiber Bragg gratings 5, the ultrashort resonant cavity II of 6 composition, the laser that resonant cavity I is produced carries out filtering and feedback, form high power single frequency laser, through 1060 end outputs of wavelength division multiplexer 14.
Claims (5)
1. the fine single frequency laser of long resonant cavity all-optical, is characterized in that: this laser comprises pumping and relevant apparatus, laserresonator, gain fibre, laser output device and other servicing unit;
Laserresonator can be linearity or loop configuration; The resonant cavity of whole laser is divided into resonant cavity I resonant cavity II two parts, the exocoel that wherein resonant cavity I is laser, the inner chamber that resonant cavity II is laser; Resonant cavity I is comprised of linear resonant cavity or ring resonator; Resonant cavity II is to form the F-P chamber with filter action by two Fiber Bragg Grating FBGs, and two Fiber Bragg Grating FBGs are middle without gain fibre or optical-fiber bundling device or wavelength-division recombiner device; Between resonant cavity I and resonant cavity II, can be furnished with gain fibre or optical-fiber bundling device or wavelength-division recombiner device; First pump light is injected in the gain fibre of resonant cavity I, and the laser of generation enters in resonant cavity II, by the filter action of resonant cavity II, filtered light is fed back in resonant cavity I and is vibrated, finally in long resonant cavity, realizes stable single-frequency output;
Pumping and relevant apparatus comprise pumping source (1), optical-fiber bundling device (2) or wavelength division multiplexer (14); Laserresonator comprises that reflection-type optical fiber Bragg grating comprises the first reflection-type optical fiber Bragg grating (5), the second reflection-type optical fiber Bragg grating (6), the 3rd reflection-type optical fiber Bragg grating (7), the 4th reflection-type optical fiber Bragg grating (8) or total reflective mirror (10);
Gain fibre in resonant cavity comprises the first gain fibre (3), the second gain fibre (4); The first gain fibre (3) or the first gain fibre (3) and the second gain fibre (4) are placed in resonant cavity I; Laser output device comprises optical isolator (9), circulator (11) or beam splitter (13); Other servicing unit is filter (12);
When resonant cavity is linear structure, the first reflection-type optical fiber Bragg grating (5) and the second reflection-type optical fiber Bragg grating (6) form resonant cavity II; The 3rd reflection-type optical fiber Bragg grating (7), the 4th reflection-type optical fiber Bragg grating (8), the first gain fibre (3) and the second gain fibre (4) form resonant cavity I; Or the second reflection-type optical fiber Bragg grating (6), the 3rd reflection-type optical fiber Bragg grating (7) in resonant cavity can be replaced and be formed resonant cavity I by total reflective mirror (10);
When resonant cavity is loop configuration, the first gain fibre (3), the 3rd reflection-type bragg grating (7), wavelength division multiplexer (14) and circulator (11) or beam splitter (13) composition annular chamber, i.e. resonant cavity I; The first reflection-type optical fiber Bragg grating (5) and the second reflection-type optical fiber Bragg grating (6) form resonant cavity II;
Pumping source (1) produces pump light, by optical-fiber bundling device (2) or wavelength division multiplexer (14), be coupled in resonant cavity I, the laser that resonant cavity I produces enters resonant cavity II again, because resonant cavity II has the effect of filtering, by the filtered light of resonant cavity II, feed back to again resonant cavity I, through the vibration of resonant cavity I, the final long chamber single-frequency laser of realizing is exported.
2. the one kind long fine single frequency laser of resonant cavity all-optical, it is characterized in that: described pumping source (1) is semiconductor laser, solid state laser, gas laser, fiber laser or Raman laser, the scope of the central wavelength lambda of output pump light is 700nm≤λ≤2000nm.
3. the one kind long fine single frequency laser of resonant cavity all-optical, it is characterized in that: described the first gain fibre (3), the second gain fibre (4) are optical fiber or the photonic crystal fibers that is mixed with rare earth element, wherein the rare earth element of doping is one or more in ytterbium, erbium, holmium, thulium, neodymium, chromium, samarium, bismuth.
4. the one kind long fine single frequency laser of resonant cavity all-optical, it is characterized in that: the reflectivity of described the first reflection-type optical fiber Bragg grating (5), the second reflection-type optical fiber Bragg grating (6), the 3rd reflection-type optical fiber Bragg grating (7), the 4th reflection-type optical fiber Bragg grating (8) and total reflective mirror (10) is R, wherein 0<R<1.
5. the fine single frequency laser of long resonant cavity all-optical, is characterized in that: described pump mode is single-ended, the both-end pumping of fibre core or covering.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261921A (en) * | 2015-11-18 | 2016-01-20 | 北京工业大学 | Short resonant cavity all-fiber narrow line-width single frequency laser |
| CN106877126A (en) * | 2017-03-31 | 2017-06-20 | 佛山科学技术学院 | Compound cavity optical fibre laser and its method for realizing xenogenesis pulse format coherent modulation |
| CN113471800A (en) * | 2021-07-01 | 2021-10-01 | 四川大学 | Bragg grating-based selectable transverse mode output laser and laser output method |
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| CN1910795A (en) * | 2002-09-18 | 2007-02-07 | 欧贝兹光波有限公司 | Traveling-wave lasers with a linear cavity |
| CN202423818U (en) * | 2011-12-22 | 2012-09-05 | 北京交通大学 | Coherent beam combination high power fiber laser based on composite annular cavity |
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2013
- 2013-12-19 CN CN201310703365.6A patent/CN103746280A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1910795A (en) * | 2002-09-18 | 2007-02-07 | 欧贝兹光波有限公司 | Traveling-wave lasers with a linear cavity |
| CN202423818U (en) * | 2011-12-22 | 2012-09-05 | 北京交通大学 | Coherent beam combination high power fiber laser based on composite annular cavity |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261921A (en) * | 2015-11-18 | 2016-01-20 | 北京工业大学 | Short resonant cavity all-fiber narrow line-width single frequency laser |
| CN106877126A (en) * | 2017-03-31 | 2017-06-20 | 佛山科学技术学院 | Compound cavity optical fibre laser and its method for realizing xenogenesis pulse format coherent modulation |
| CN113471800A (en) * | 2021-07-01 | 2021-10-01 | 四川大学 | Bragg grating-based selectable transverse mode output laser and laser output method |
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