CN102244343B - Intra-cavity frequency-doubled green fiber laser with all-fiber structure - Google Patents
Intra-cavity frequency-doubled green fiber laser with all-fiber structure Download PDFInfo
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Abstract
The invention discloses an intra-cavity frequency doubling green-ray fiber laser with a full optical fiber structure. The laser comprises a pumping assembly, a first fiber bragg grating, a third fiber bragg grating, a second fiber bragg grating and a first tail fiber, wherein the output end of the pumping assembly is connected with the first fiber bragg grating; the first fiber bragg grating, the third fiber bragg grating and the second fiber bragg grating are arranged concentrically; a double-pack yttrium-doping optical fiber is connected between the first fiber bragg grating and the third fiber bragg grating; an intra-cavity frequency doubler is connected between the third fiber bragg grating and the second fiber bragg grating; the output end of the second fiber bragg grating is connected with the first tail fiber; and all the components are connected in a molten connecting mode. According to the invention, an optical fiber laser technology and a full-solid intra-cavity frequency doubling technology are combined by the laser, intra-cavity frequency doubling is realized by adopting the full optical fiber structure, the laser outputs at the green ray wave band, the defects caused by the formation of discrete components for the existing laser are overcome, the optical conversion efficiency is improved, the output light bundle has good quality, the light-light conversion efficiency is high, the structure is compact, the performances are stable, and the frequency doubling efficiency is approximate to 100%.
Description
Technical field
The invention belongs to laser technology field, be specifically related to the intracavity frequency doubling green-light fiber laser of a kind of laser, particularly a kind of all optical fibre structure.
Background technology
In recent years; Fiber laser is little with its volume, advantages such as efficient is high, good stability, good beam quality; Development very rapidly; But ripe, that account for more than half market share at present high-capacity optical fiber laser, output wavelength mainly concentrates on 1030nm-1100nm, and the unification of output wavelength has limited the fiber laser especially application of visible light wave range in a lot of fields.And corresponding, in all solid state laser, utilize the nonlinear frequency transformation technology obtaining to have obtained fine effect aspect the visible light wave range laser technology, particularly all solid state laser inner cavity frequency-doubling technology; Almost become the main force of visible waveband solid state laser; But run into a contradiction when inner cavity frequency-doubling technology is applied to fiber laser: the advantage of fiber laser is its full fiberize welding, and no discrete component is so its good stability, non-maintaining and be easy to use; If but insert the such discrete component of frequency-doubling crystal; Must destroy the fiber laser good stability, non-maintaining and wieldy advantage loses the market competitiveness.
Existing fiber laser frequency doubling technology mainly is confined to cavity external frequency multiplication or inner chamber discrete component frequency multiplication; Like double-side pumping intracavity frequency doubling double clad green-light fiber laser (application number: 200620079299.5); The doubly clad optical fiber intracavity frequency doubling laser (patent No.: 03116633.4), inner cavity frequency doubling Blue-light optical fiber laser (application number: 200820155748.9), high-power blue-light fiber laser (application number: 200620079296.1); These lasers all are that discrete component constitutes; In essence, these technology all are the reprints of all solid state intracavity frequency doubling technology, though it is moved into fiber laser; But the high stability that fiber laser self is had has been destroyed, and can not show the advantage of fiber laser.In addition; Existing green glow fibre laser mostly is gain substance with the neodymium-doped fiber; As outside the dual wavelength Nd laser intracavity frequency doubling chamber with frequently red-green-blue laser (application number: 02117363.x); (application number: 200820155748.9), the efficient of these fiber lasers is not good enough, can not satisfy the needs of technical development for inner cavity frequency doubling Blue-light optical fiber laser.Therefore, propose a kind of intracavity frequency doubling green-light fiber laser of all optical fibre structure, have important practical significance for the efficient and the stability that improve fiber laser.
Summary of the invention
The objective of the invention is to; A kind of green-light fiber laser of intracavity frequency doubling of all optical fibre structure is provided, and this laser device has combined fiber laser technology and all solid state intracavity frequency doubling technology, adopts all optical fibre structure to realize intracavity frequency doubling; Output is at green light band; Overcome the defective that existing laser causes because of discrete component constitutes, and improved light conversion efficiency, the good beam quality of output, light-light conversion efficiency height, compact conformation, operating cost are low, non-maintaining.
In order to realize above-mentioned technique effect, the present invention adopts following technical solution:
A kind of intracavity frequency doubling green-light fiber laser of all optical fibre structure; It is characterized in that; Comprise pumping assembly, first fiber grating, the 3rd fiber grating, second fiber grating and first tail optical fiber; The output of pumping assembly connects first fiber grating, is connected with the double clad Yb dosed optical fiber between first fiber grating and the 3rd fiber grating, is connected with the intracavity frequency doubling device between the 3rd fiber grating, second fiber grating; The output of second fiber grating connects first tail optical fiber, and above-mentioned each element connects through fusing mode.
The present invention also comprises following other technologies characteristic:
Said pumping assembly is the 808nm diode-end-pumped assembly of the fine output of magnetic tape trailer.
It is the total reflection Bragg fiber grating of 1080nm that said first fiber grating, second fiber grating adopt centre wavelength, and it is the total reflection Bragg fiber grating of 540nm that the 3rd fiber grating adopts centre wavelength.
Said intracavity frequency doubling device comprises frequency-doubling crystal, first GRIN Lens, second GRIN Lens, second tail optical fiber and the 3rd tail optical fiber; Said first GRIN Lens, second GRIN Lens are connected to the left and right two ends of frequency-doubling crystal; The left end of said first GRIN Lens is connected with second tail optical fiber; The right-hand member of second GRIN Lens is connected with the 3rd tail optical fiber; Second tail optical fiber, the 3rd tail optical fiber, first GRIN Lens, second GRIN Lens and the whole conllinear of frequency-doubling crystal, constituting with the frequency-doubling crystal jointly is the symmetry structure at center.
The outside of said first GRIN Lens, second GRIN Lens, frequency-doubling crystal is enclosed with indium foil and heat conduction copper billet successively; A side of said heat conduction copper billet contacts with heat dissipation equipment; The remaining surface of heat conduction copper billet is encapsulated in inside pipe casing; Second tail optical fiber from the left end of sleeve pipe pass and with the 3rd fiber grating welding, the 3rd tail optical fiber passes and the second fiber grating welding from the right-hand member of sleeve pipe.
Said heat dissipation equipment adopts radiator or water cooling equipment.
Said frequency-doubling crystal adopts the ktp crystal of 4mm*4mm*6mm.
The self focusing length of said first GRIN Lens, second GRIN Lens is 0.2P-0.3p.
Said second tail optical fiber and the 3rd tail optical fiber adopt the outside optical fiber that is with capillary glass tube.
Technical characterictic of the present invention and advantage are following:
1) the present invention is formed by connecting through the fused fiber splice mode assemblies such as frequency multipliers in pumping assembly, grating, double clad Yb dosed optical fiber, the fiber laser cavity; Adopt all optical fibre structure to realize the intracavity frequency doubling of green-light fiber laser; No discrete component needs adjustment; Realize the output of 540nm green laser, good beam quality, reliability height, compact conformation, operating cost are low, non-maintaining.
2) frequency multiplier is formed according to from the inside to surface order encapsulation by frequency-doubling crystal, GRIN Lens, tail optical fiber, heat conduction copper billet and encapsulation sleeve pipe in the fiber laser cavity; Solved integrated this technical barrier of the fiberize of frequency-doubling crystal in the laser; Reduced the difficulty of laser assembling; Increase complete machine stability and reliability, realized that fine melt connects, exempts to adjust final assembly, lay a good foundation for realizing pipelining and batch process.
3) preparation and encapsulation have taken into full account the heat dissipation problem of frequency-doubling crystal; Adopt the indium foil parcel to be encapsulated in the heat conduction copper billet; Face of heat conduction copper billet links to each other with external heat sink, and is different according to the frequency-doubling crystal heat dissipation capacity, can external different radiating device; The employing natural cooling less for power, that heat radiation is less or air-cooled adopts semiconductor refrigerating or water-cooled for high power running or the bigger frequency-doubling crystal of heat radiation.
4) adopt two GRIN Lens (P is the GRIN Lens pitch) that length is 0.23P, realize effectively having improved device efficiency, simplified assembly difficulty from the symmetrical structure of optical fiber, GRIN Lens, frequency-doubling crystal, GRIN Lens, optical fiber.
5) be the GRIN Lens of 0.23p owing to having adopted length, make that facula area is less in frequency-doubling crystal, power density is improved shg efficiency greatly, helps the output of high power laser light.
6) the present invention is by two fundamental frequency light total reflection fiber gratings and a frequency doubled light total reflection optical fiber optical grating constitution inner cavity frequency-doubling structure; Fundamental frequency light is all-trans at two fundamental frequencies and forms vibration between the grating; Frequency-doubling crystal places two fundamental frequencies to be all-trans between the grating; Fundamental frequency light does not have the loss of leaking, and the consumption of fundamental frequency light will all convert frequency doubled light into through frequency-doubling crystal, realizes the single-ended output of frequency doubled light through frequency doubled light total reflection optical fiber grating again; Reduce fundamental frequency light and frequency doubled light loss, make that fundamental frequency light can be near 100% to the conversion efficiency of frequency doubled light.
Innovative point of the present invention and beneficial effect are following:
1, the intracavity frequency doubling green-light fiber laser of all optical fibre structure of the present invention; Be formed by connecting through the fused fiber splice mode assemblies such as frequency multipliers in pumping source, fiber grating, active doubly clad optical fiber, the fiber laser cavity; No discrete component needs adjustment, has very high stability and good beam quality.
2, intracavity frequency doubling green-light fiber laser of the present invention is by two fundamental frequency light total reflection fiber gratings and a frequency doubled light total reflection optical fiber optical grating constitution inner cavity frequency-doubling structure; Fundamental frequency light is all-trans at two fundamental frequency light and forms vibration between the fiber grating; Because frequency-doubling crystal places in the chamber; Fundamental frequency light does not have the loss of leaking; The consumption of fundamental frequency light will all convert frequency doubled light into through frequency-doubling crystal, realizes the single-ended output of frequency doubled light through frequency doubled light total reflection optical fiber grating again, makes laser have very high frequency-doubling conversion efficiency.
3, frequency multiplier is formed according to encapsulating to outer order in the clump by frequency-doubling crystal, GRIN Lens, tail optical fiber, heat conduction copper billet and enclosure in the fiber laser cavity of the present invention; The invention of this device has solved the contradiction on using between fiber laser and the discrete component frequency-doubling crystal; Make that optical-fiber laser device system configuration obtains simplifying; Be convenient to assembling, lay a good foundation for realizing pipelining and batch process.
To sum up, the present invention has that all optical fibre structure, good beam quality, shg efficiency are high, compact conformation, and is solid and reliable, be easy to assembling, advantage such as applied widely, is the green-light fiber laser that application is strong, realize the 540nm wavelength.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a frequency multiplier structure top plan view in the fiber laser cavity.
Fig. 3 is the front sectional elevation of frequency multiplier in the fiber laser cavity that connects heat dissipation equipment.Wherein, (a) being front perspective view, (b) is right side sectional view.
Fig. 4 is fundamental frequency light in the laser of the present invention and the frequency doubled light index path of advancing.
Fig. 5 is 540nm laser output power and pump power graph of a relation.
Below in conjunction with accompanying drawing and embodiment the present invention is further explained.
Embodiment
As shown in Figure 1; The intracavity frequency doubling green-light fiber laser of all optical fibre structure of the present invention; Comprise pumping assembly 1, first fiber grating 2, the 3rd fiber grating 4, second fiber grating 6 and first tail optical fiber 7; The output of pumping assembly 1 connects to be connected with between first fiber grating, 2, the first fiber gratings 2 and the 3rd fiber grating 4 between double clad Yb dosed optical fiber 3, the three fiber gratings 4, second fiber grating 6 and is connected with intracavity frequency doubling device 5; The output of second fiber grating 6 connects first tail optical fiber 7, and above-mentioned each element connects through fusing mode.
Like Fig. 2, shown in Figure 3; Intracavity frequency doubling device 5 comprises first GRIN Lens 9, frequency-doubling crystal 10, second GRIN Lens 11, second tail optical fiber 8 and the 3rd tail optical fiber 13; First GRIN Lens 9, second GRIN Lens 11 lay respectively at frequency-doubling crystal 10 left and right two ends, and be all bonding with frequency-doubling crystal 10; It is bonding that the left end of first GRIN Lens 9 and second tail optical fiber 8 have an end of tail optical fiber contact pin; It is bonding that the right-hand member of second GRIN Lens 11 and the 3rd tail optical fiber 13 have an end of tail optical fiber contact pin; Second tail optical fiber 8, the 3rd tail optical fiber 13, first GRIN Lens 9, second GRIN Lens 11 and frequency-doubling crystal 10 whole conllinear, constituting with frequency-doubling crystal 10 jointly is the symmetry structure at center.The outside of first GRIN Lens 9, second GRIN Lens 11, frequency-doubling crystal 10 is enclosed with indium foil and heat conduction copper billet 12 successively; The side and the heat dissipation equipment 15 of said heat conduction copper billet 12 join; The remaining surface of heat conduction copper billet 12 is encapsulated in sleeve pipe 14 inside; Second tail optical fiber 8 from the left end of sleeve pipe 14 pass and with 4 weldings of the 3rd fiber grating, the 3rd tail optical fiber 13 passes and 6 weldings of second fiber grating from the right-hand member of sleeve pipe 14, adopts fibre core to aim at during each element welding.
The manufacturing process of laser of the present invention is following:
A) choosing of element: the 808nm diode-end-pumped source that pumping assembly 1 adopts the fine output of magnetic tape trailer; It is the total reflection Bragg fiber grating of 1080nm that first fiber grating 2, second fiber grating 6 adopt centre wavelengths; Double clad Yb dosed optical fiber 3 adopts the double clad Yb dosed optical fiber of 6/125um, and it is the total reflection Bragg fiber grating of 540nm that the 3rd fiber grating 4 adopts centre wavelength.Frequency-doubling crystal 10 can adopt KTP, LBO, BBO, PPLN, PPKTP etc., and all nonlinear crystals of green light band frequency multiplication that is applicable to all can use, and present embodiment adopts the ktp crystal of 4*4*6mm, selects the angle coupling for use, but is not limited to this size and angle coupling; The self focusing length of first GRIN Lens 9, second GRIN Lens 11 is 0.2P-0.3p (P is the GRIN Lens pitch), and self focusing length is suitably adjusted according to the length and the type of frequency-doubling crystal, is 0.23P in the present embodiment; Indium foil is in order to strengthen the thermal conduction characteristic of frequency-doubling crystal to the heat conduction copper billet; Second tail optical fiber 8 adopt the type of optical fiber to need and the 3rd fiber grating 4 with the tail optical fiber structure be complementary; The fiber type that the 3rd tail optical fiber 13 adopts need and second fiber grating 6 with the tail optical fiber structure be complementary; Choose the optical fiber that is complementary with second tail optical fiber 8, the 3rd tail optical fiber 13; Process the tail optical fiber contact pin at its outer cover capillary glass tube, process second tail optical fiber 8, the 3rd tail optical fiber 13 through operations such as assembling, gluing, baking-curing, grinding, polished end faces processing; Select the heat conduction copper billet 12 and the sleeve pipe 14 of suitable dimension according to the size of heat dissipation capacity, encapsulation sleeve pipe 14 adopts metal or other materials, and matching requirements closely cooperate between encapsulation sleeve pipe 14 and the heat conduction copper billet 12; Heat dissipation equipment 15 is peripheral components of intracavity frequency doubling device 5, is used to cool off frequency-doubling crystal 10 and makes it surface temperature control at 20 ℃.Can adopt radiator or water cooling equipment according to device power selection fin natural cooling, air-cooled, water-cooled or TEC semiconductor refrigerating, present embodiment adopts fin to add the air-cooled structure of fan.
B) end face polishing: the end face to optical fiber head, GRIN Lens, frequency-doubling crystal etc. carries out polishing;
C) assembling and encapsulation: first GRIN Lens 9, second GRIN Lens 11, frequency-doubling crystal 10 outsides are pressed in the heat conduction copper billet after with the indium foil parcel; Second tail optical fiber 8 during assembling, the 3rd tail optical fiber 13, first GRIN Lens 9, second GRIN Lens 11 and frequency-doubling crystal 10 conllinear; Particularly second tail optical fiber 8 and the 3rd tail optical fiber 13 must strict conllinear; Adopt folk prescription to assembling; Through sleeve pipe 14 first GRIN Lens 9, second GRIN Lens 11 and the heat conduction copper billet 12 that is embedded with frequency-doubling crystal 10 are encapsulated, second tail optical fiber 8, the 3rd tail optical fiber 13 pass from sleeve pipe 14, during encapsulation heat conduction copper billet 12 bottom surfaces are exposed; The bottom surface of heat conduction copper billet 12 is contacted back fixing with heat abstractor 15, accomplish assembling.
With frequency multiplier in pumping assembly 1, first fiber grating 2, yb-doped double-clad fiber 3, the 3rd fiber grating 4, the fiber laser cavity 5, second fiber grating 6, first tail optical fiber 7 successively through the welding of doubly clad optical fiber heat sealing machine; Whole fusion process satisfies welding requirement (each weld splice loss, splice attenuation < 0.1dB) and gets final product, and need not debugging.
See from structure; Laser of the present invention structurally has many similarities with all solid state inner cavity frequency-doubling laser, discrete component inner cavity frequency-doubling fiber laser commonly used at present; All partly be made up of pumping source, working-laser material, resonant cavity, frequency-doubling crystal etc., different is that what the present invention adopted is the inner cavity frequency-doubling of all optical fibre structure; Its stability and reliability of having acted on fiber laser fully is high; Non-maintaining and wieldy advantage, laser volume of the present invention is little, easy of integration simultaneously.
Mentality of designing of the present invention and reaction principle:
Among the present invention; The diode-end-pumped assembly 1 of the fine output of magnetic tape trailer provides laser pumping; Pump light sees through the inner cladding that first fiber grating 2 injects yb-doped double-clad fibers 3, along with pump light transmits in inner cladding and gets into the fibre core of yb-doped double-clad fiber 3 continuously; As shown in Figure 4, the fibre core of yb-doped double-clad fiber 3 constitutes working-laser material (Yb
3+), it is the 1080nm laserresonator that the fibre core of first fiber grating 2, yb-doped double-clad fiber 3 and second fiber grating 6 constitute wavelength, i.e. the fundamental frequency part of laser of the present invention, working-laser material (Yb
3+) produce the fluorescent radiation of 1080nm after the absorptive pumping light energy; This fluorescent radiation is constantly reflection between first fiber grating 2 and second fiber grating 6; Repeatedly being strengthened forming wavelength by continuous amplification through the fibre core of yb-doped double-clad fiber 3 is the laser generation of 1080nm, at this moment, because fundamental frequency light continuous reflection and not output between first fiber grating 2 and second fiber grating 6; Thereby form a fiber laser that does not have output, the dotted line of the latter half is the fundamental frequency light light path of advancing among Fig. 4.
The frequency multiplication part of the 3rd fiber grating 4 and interior frequency multiplier 5 formations of fiber laser cavity laser of the present invention; Along with the base frequency oscillation of laserresonator is constantly strengthened; Fundamental frequency light is through producing second harmonic (frequency multiplication) in the fiber laser cavity during frequency multiplier 5; Thereby from wavelength is that the fundamental frequency light of 1080nm converts the frequency doubled light that wavelength is 540nm into, and the dotted line of Fig. 4 the first half is the frequency doubled light light path of advancing, and the frequency doubled light of left-hand is become dextrad by the 3rd fiber grating 4 reflection back direct of travels; The frequency doubled light that dextrad is advanced is exported by first tail optical fiber 7 through second fiber grating, 6 backs, thereby obtains higher shg efficiency.In whole process, the pumping assembly continues to provide energy to inject, and yb-doped double-clad fiber 3 consumes pump light and produces fundamental frequency light, and frequency-doubling crystal 10 consumes fundamental frequency light and produces frequency doubled light, and this process finally reaches stable state, keeps continuous stable state double-frequency laser output.
Track in the laser of fundamental frequency trimmed book invention is following:
The wavelength that dextrad is advanced is that the fundamental frequency light of 1080nm is from tail optical fiber 8 left end incidents; Get into frequency-doubling crystal 10 via first GRIN Lens 9; It is the frequency doubled light that the dextrad of 540nm is advanced that part fundamental frequency light is converted into wavelength; The frequency doubled light that this dextrad is advanced gets into second GRIN Lens, 11 backs from tail optical fiber 13 outputs, behind second fiber grating 6, exports from first tail optical fiber 7 again.Remaining fundamental frequency light continues dextrad advances, and it is converged into by second GRIN Lens 11 that tail optical fiber 13 backs get into second fiber gratings 6, is reflected into the fundamental frequency light that left-hand is advanced by second fiber grating 6, gets into the fundamental frequency light light path (as shown in Figure 4) of advancing.
When the fundamental frequency light that left-hand is advanced gets into intracavity frequency doubling device 5; It is the frequency doubled light of 540nm that part is converted into the wavelength that left-hand advances; Remainder fundamental frequency light continues left-hand advances, and through yb-doped double-clad fiber 3 time, is exaggerated, and amplifies back arrival first fiber grating 2 and is reflected as dextrad.To sum up, all fundamental frequency light are exaggerated when constantly passing through yb-doped double-clad fiber 3, are converted into frequency doubled light continuously through frequency-doubling crystal 10, and theoretical efficiency reaches 100%.
The frequency doubled light that left-hand is advanced gets into first GRIN Lens, 9 backs from 8 outputs of second tail optical fiber; Be reflected as dextrad when arriving the 3rd fiber grating 4; The frequency doubled light that this dextrad is advanced gets into GRIN Lens 9, frequency-doubling crystal 10, GRIN Lens 11, tail optical fiber 13, second fiber grating 6 successively along second tail optical fiber 8, from 7 outputs of first tail optical fiber.
Fig. 5 is 540nm laser output power and pump power graph of a relation, can see from Fig. 5, when pump power 32.5W, obtains laser output power and reaches 11.98W, and light-light conversion efficiency is 36.9%, and slope efficiency is 42.1%.It is thus clear that good beam quality, the light-light conversion efficiency of laser output of the present invention are high.
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| CN102738690B (en) * | 2012-06-29 | 2014-04-09 | 西北大学 | 540nm all-fiber high-power green fiber laser |
| CN102751654B (en) * | 2012-06-29 | 2013-11-06 | 西北大学 | Converged optical fiber laser intracavity frequency doubling device |
| CN102738689B (en) * | 2012-06-29 | 2014-04-09 | 西北大学 | 660nm high-power red light optical fiber laser having full optical fiber structure |
| CN102751649B (en) * | 2012-06-29 | 2014-05-14 | 西北大学 | 469nm full-fiber-structure high-power blue light fiber laser device |
| CN102891427A (en) * | 2012-10-16 | 2013-01-23 | 中国科学院上海光学精密机械研究所 | Small frequency multiplication visible light fiber laser |
| CN104009379A (en) * | 2014-05-14 | 2014-08-27 | 深圳大学 | All-fiber laser frequency mixer and frequency mixer fiber laser thereof |
| CN104242039A (en) * | 2014-09-23 | 2014-12-24 | 合肥恒锐光电科技有限公司 | Small-size frequency doubling green light optical fiber laser |
| CA2998492A1 (en) * | 2015-09-15 | 2017-03-23 | University Of Rochester | Green laser for display applications |
| CN105244738A (en) * | 2015-10-14 | 2016-01-13 | 安徽大学 | Single-frequency narrow linewidth green laser device |
| CN105356216A (en) * | 2015-11-16 | 2016-02-24 | 华南理工大学 | All-fiber narrow-linewidth single frequency green laser |
| CN106229804B (en) * | 2016-09-12 | 2019-05-14 | 南京南智先进光电集成技术研究院有限公司 | A kind of large-power optical fiber base pure-tone pulse laser |
| CN110797739A (en) * | 2019-12-06 | 2020-02-14 | 瑞尔通(苏州)医疗科技有限公司 | An integrated fiber laser engine |
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| JP5390907B2 (en) * | 2009-03-31 | 2014-01-15 | 古河電気工業株式会社 | Cascade Raman resonator and optical fiber laser |
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| CN2927418Y (en) * | 2006-06-29 | 2007-07-25 | 西北大学 | High Power Blue Fiber Laser |
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