CN202059039U - Double cladding photonic crystal fiber laser of 980nm - Google Patents
Double cladding photonic crystal fiber laser of 980nm Download PDFInfo
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- CN202059039U CN202059039U CN2011200895210U CN201120089521U CN202059039U CN 202059039 U CN202059039 U CN 202059039U CN 2011200895210 U CN2011200895210 U CN 2011200895210U CN 201120089521 U CN201120089521 U CN 201120089521U CN 202059039 U CN202059039 U CN 202059039U
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Abstract
Provided is a double cladding photonic crystal fiber laser of 980nm, belonging to the field of laser technology and comprising a semiconductor laser diode of 915nm, a first flat convex lens, a dichroscope, a second flat convex lens 4, a double cladding photonic crystal fiber, a lens, and a filter sequentially arranged along the direction of light propagation. By selecting a rational length of the double cladding photonic crystal fiber, the four-level oscillation-starting can be inhibited and the maximum output of the laser of 980nm can be realized. The system, with simple structure and easy operation, achieves the output of laser of 980nm. The double cladding photonic crystal fiber laser of 980nm can be used as a pump light source for an erbium doped fiber amplifier and can be widely applied to the communication field. The laser of 980nm can obtain the output of laser of 490 nm via a frequency multiplication crystal and can be used in the field of ocean exploration.
Description
Technical field
The utility model relates to a kind of 980nm double-clad photon crystal optical fibre laser, belongs to laser technology field.
Background technology
Fiber laser is with the optical fiber that the is mixed with rare earth ion laser as gain media, along with doping techniques constantly develops, the design of doped fiber and manufacture level are also progressively improving, add the develop rapidly of high-power semiconductor laser, fiber laser is owing to its efficient height, good beam quality, little, the no water-cooled of volume, can realize advantage such as full fibrillation, all obtained to use widely in fields such as optical communication, light sensing, laser processings, solid state laser competition with traditional becomes one of laser technology with fastest developing speed in the current laser field.
In numerous doped fiber lasers, ytterbium-doping optical fiber laser is with the fastest developing speed.Current high-power fiber laser is mainly based on the ytterbium-doping optical fiber laser of four-level.Compare with other doped fiber lasers, there is not excited state absorption (ESA) in it, does not have the high advantage of concentration quenching effect and conversion quantum efficiency.The output wavelength of quasi-three-level ytterbium-doping optical fiber laser is 980nm, and the 980nm laser is the important pump light source of erbium-doped fiber amplifier.Along with the increase of the channel number of dense wave division multipurpose, the power of erbium-doped fiber amplifier output laser has been proposed more and more higher requirement, obtaining high-power and high-lighting beam quality 980nm lasing light emitter just becomes and needs one of key issue that solves.
Compare with the 980nm semiconductor laser, the 980nm fiber laser can have power output height, good beam quality simultaneously and realize the advantage that power is synthetic easily.Initial people adopts common highly doped single-mode ytterbium-doping optical fiber to realize the output of 980nm laser as gain media.But because the little core size restriction of common single-mode ytterbium-doping optical fiber, it is the 915nm or the 940nm single mode semiconductor laser of hundred mW magnitudes that pumping source can only adopt power output, so limited the raising of laser output power.The appearance of photonic crystal fiber has solved this problem, utilizes the large-numerical aperture of Yb-doped photon crystal optical fiber, big die face to amass, easily keep the characteristic of single mode transport, can obtain the 980nm laser output of high-power and high-lighting beam quality.The existing both at home and abroad relevant report of the research of 980nm ytterbium-doping optical fiber laser, as: Pu Sidun university of Nanan made gain media with numerical aperture greater than 0.7 photonic crystal fiber in 2003, obtained the output of 1.4W single mode 977nm laser.In the same year, they have reported that again the numerical aperture with design voluntarily is 0.5, inner cladding diameter 28 μ m, and the photonic crystal fiber of core diameter 10 μ m, the laser of the nearly diffraction limit 977nm of acquisition 3.5W, tiltedly efficient reaches 42%.2008, the Freed Uni Jena of Germany was 80 μ m by 915nm pumping core diameter, and inner cladding is the bar-shaped photonic crystal fiber of 200 μ m, obtained the 980nm laser output of 94W.In the same year, France utilizes the photonic crystal fiber of powerful 915nm laser pumping same size, has obtained the laser output of the 977nm of 94W.Theory and experimental study first carried out to common single-mode ytterbium-doping optical fiber laser of 980nm and amplifier in this laboratory.Utilize the common single-mode ytterbium-doping optical fiber of homemade 946nm laser pumping,, select best optical fiber parameter, experimentally obtain the 980nm single mode output of 1.32W by Theoretical Calculation and sunykatuib analysis.
Full-optical-fiber laser utilizes grating to test the output of 980nm small-power for feedback cavity mirror and outgoing mirror, this structure simply and easily is the development trend of quasi-three-level ytterbium-doping optical fiber laser, but this laser output power is less, can not satisfy the requirement in some application.Use the optical fiber laser structure complexity of general flat mirror as chamber mirror experiment 2W978nm output, poor stability, and since frequency-doubling crystal PPLN accept wavelength and the temperature bandwidth is all very little, and the thickness direction of periodic polarized crystal is small-sized, so when obtaining 980nm laser, beam quality and focusing system are all had very high requirement.
The utility model content
The purpose of this utility model is to provide a kind of 980nm double-clad photon crystal optical fibre laser, the utlity model has simple in structure, easy to operate advantage.
To achieve these goals, the utility model has been taked following technical scheme.The utility model comprises 915nm semiconductor laser diode 1, first planoconvex spotlight 2, dichroic mirror 3, second planoconvex spotlight 4, double-clad photon crystal optical fibre 5, lens 6 and the optical filtering 7 that sets gradually along the direction of propagation of light.The laser that sends from 915nm semiconductor laser diode 1 is coupled into double-clad photon crystal optical fibre 5 after focusing on through first planoconvex spotlight 2, dichroic mirror 3, second planoconvex spotlight, 4 collimations successively; 980nm laser and remaining 915nm pump light see through second planoconvex spotlight 4 respectively and obtain the output of 980nm laser with dichroic mirror 3, lens 6 with optical filtering 7 optical filterings from the both ends of the surface outgoing of double-clad photon crystal optical fibre.
Above-mentioned 915nm semiconductor laser diode 1 has tail optical fiber 8.
3 pairs of 915nm light of described dichroic mirror are high thoroughly, 980nm light is high anti-, play filter action.
Described optical filtering 7 is high saturating for being coated with 980nm, the Multicolour mirror of the high anti-and 1030～1100nm high-reflecting film of 915～946nm.
The utility model can obtain following beneficial effect:
In utility model, adopt 915nm semiconductor laser diode 1 pumping source as the double-clad photon crystal optical fibre laser.Because it is relatively large at the absorption cross-section at 915nm place to mix the photonic crystal fiber of ytterbium, and the effective core diameter area of the photonic crystal fiber of double clad is bigger, the pump light ratio is easier to coupled into optical fibres, by high saturating to 915nm, the high anti-dichroic mirror 3 of 980nm and second planoconvex spotlight 4 be focused into be mapped in the double-clad photon crystal optical fibre 5, realize the laser dual-end outgoing, and output even the damage diode that can avoid 980nm laser to incide influence 915nm light in the 915nm semiconductor laser diode.
The utility model is with the simplest resonant cavity of structure: promptly directly realized the laser diode-pumped quasi-three-level double-clad photon crystal optical fibre laser with existing 915nm as resonant cavity with the end face at two 0 ° of angles of photonic crystal fiber, by Theoretical Calculation and simulation, select optimum fiber length to obtain the maximum output of 980nm laser, constituted laser simple in structure, easy to operate.This 980nm double-clad photon crystal optical fibre laser can be used as the pump light source of erbium-doped fiber amplifier, is widely used in the communications field; 980nm laser also can obtain the output of 490nm laser by frequency-doubling crystal simultaneously, is applied to the marine exploration field.
Compare with other monomode fiber or bar-shaped photonic crystal fiber, the affected property of photonic crystal fiber of the big mould of the big flexibility field that we are used is stronger.Because adopting bar-shaped photonic crystal fiber to have a defective is exactly that optical fiber can not be crooked, be easy to fracture; And common single-mode ytterbium-doping optical fiber since the structural limitations of itself coupling efficiency of pump light, thereby limited the high power output of 980nm laser.So we attempt realizing the output of 980nm laser in the big mould area double-cladding photonic crystal fiber of common flexibility.Gain relationship analysis according to 980nm and 1030nm in the existing Yb dosed optical fiber, the optimum length of appropriate design photonic crystal fiber, wavelength with optical fiber coupling output in the experiment is diode (LD) the pumping Yb-doped photon crystal optical fiber of 915nm, under the both-end way of output, obtain the continuous single-mode laser output of 980nm of 463.3mW, the oblique efficient of fiber laser is that 17.8%, two 0 ° fiber end face of spending the angle is as the chamber mirror; In the single-ended way of output, when promptly the fiber end face at 0 ° of degree angle and high reflective mirror were as the chamber mirror, the 980nm output power of laser reached 543mW, and corresponding tiltedly efficient is 11.6%.Adopting the cladding diameter of photonic crystal fiber in the experiment is 200 μ m, and core diameter is 40 μ m, and fiber lengths is 45cm, adopts average cavity configuration, and recording spectral bandwidth in the experiment is 6nm, and centre wavelength is 980nm.
Description of drawings
The structural representation of Fig. 1 the utility model 915nm semiconductor laser diode pumped quasi three level double-clad photon crystal optical fibre laser
Among the figure: 1.915nm semiconductor laser diode, 2. first planoconvex spotlight, 3. dichroic mirror, 4. second planoconvex spotlight, 5. double-clad photon crystal optical fibre, 6. lens, 7. optical filtering, 8. tail optical fiber.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, present embodiment comprises 915nm semiconductor laser diode 1, first planoconvex spotlight 2, dichroic mirror 3, second planoconvex spotlight 4, double-clad photon crystal optical fibre 5, lens 6, the optical filtering of magnetic tape trailer fibre.
As shown in Figure 1: the laser that 915nm semiconductor laser diode 1 sends is 8 outputs of 0.22 tail optical fiber by core diameter 200 μ m, numerical aperture, and the corresponding 915nm laser of LD maximum current 45A peak power output is 30W.915nm light is that first planoconvex spotlight 2, dichroic mirror 3, the focal length of 8mm is after second planoconvex spotlight, 4 collimations of 8mm focus on through focal length successively, its output peak power output is 28.5W, directly be coupled in the double-clad photon crystal optical fibre 5, the coupling efficiency that records 915nm laser in the experiment is 81.1%.980nm laser is from the both ends of the surface outgoing of double-clad photon crystal optical fibre 5, respectively through behind second planoconvex spotlight 4, lens 6 collimations, again respectively by dichroic mirror 3, optical filtering 7 outgoing, 3 pairs of 915nm light of dichroic mirror are high thoroughly, 980nm light is high anti-, play filter action, optical filtering 7 is saturating for being coated with the 980nm height, 915～946nm high anti-and the high anti-Multicolour mirror of 1030～1100nm, the filter plate of exporting as 980nm laser in this experiment.The light of dichroic mirror 3 and optical filtering 7 reflections does not need to pass through planoconvex spotlight 4 and photonic crystal fiber 5 again.Measuring from dichroic mirror 3 emitting laser maximum powers is 254.3mW, from optical filtering 7 emitting laser maximum powers is 209mW, the pump light threshold value is about 16.2W, total tiltedly efficient of laser is 17.8%, laser all has output at 978nm～982nm, output linewidth is 6nm, and centre wavelength is 980nm.
The Yb dosed optical fiber resonant cavity is exactly whole double-clad photon crystal optical fibre 5, the 915nm pump light is to incide in the double-clad photon crystal optical fibre 5 by having dichroiscopic coupled system, the cladding diameter of double-clad photon crystal optical fibre 5 is 200 μ m, core diameter is 40 μ m, pump light 915nm absorption coefficient is approximately 30dB/m, the optical fiber both ends of the surface are ground into 0 ° of degree angle, and direct two chamber mirrors as resonant cavity, the optical fiber both ends of the surface are 4% (Fresnel reflection) to the reflectivity of laser, with compare as the resonant cavity of chamber mirror with level crossing, reduced cavity loss to greatest extent, and simple in structure, easy to adjust.Laser focuses on by second planoconvex spotlight 4 and lens 6 respectively from double-clad photon crystal optical fibre 5 both ends of the surface outgoing, sees through dichroic mirror 3 and optical filtering 7 optical filterings again respectively, and filtering 915nm pump light obtains 980nm laser.Equal substantially from the power of double-clad photon crystal optical fibre 5 two ends output.
Because the four-level of ytterbium-doping optical fiber laser is very easy to starting of oscillation, be the prerequisite that guarantees the quasi-three-level running so suppress the four-level starting of oscillation.Under the situation that pump absorption coefficient and laser absorption coefficient are determined, the linear proportional relation of the gain of the gain of four-level and quasi-three-level in the double-clad photon crystal optical fibre laser, and the gain of quasi-three-level and fiber lengths have substantial connection.Gain less than quasi-three-level by selecting suitable fiber lengths that four-level is gained, thus the normal operation of assurance quasi-three-level ytterbium-doping optical fiber laser.The quasi-three-level ytterbium-doping optical fiber laser has heavy sink effect to laser, under the prerequisite that satisfies abundant absorptive pumping light, selects fiber lengths will avoid Yb dosed optical fiber that laser is had too much heavily absorption.So the designing gain fiber lengths must balancedly be considered the maximum output of laser and suppress the requirement of four-level starting of oscillation to fiber lengths, be that fiber lengths is satisfying under the prerequisite that suppresses the four-level starting of oscillation, fiber lengths need meet following principle: when pump light propagates into optical fiber connector, remaining pumping light power just in time equals the threshold power of optical fiber quasi-three-level starting of oscillation, and such fiber lengths can calculate and the best fiber lengths of experimental simulation acquisition by binding isotherm.At this moment export the laser power maximum, efficiency of laser is also the highest, the long photonic crystal of the intercepting 45cm research that experimentizes earlier.
More than be basic embodiment of the present utility model, any execution mode that obtains based on the existing knowledge of those skilled in the art's combination of the present utility model also belongs to protection category of the present utility model.
Claims (4)
1.980nm the double-clad photon crystal optical fibre laser is characterized in that: it comprises 915nm semiconductor laser diode (1), first planoconvex spotlight (2), dichroic mirror (3), second planoconvex spotlight (4), double-clad photon crystal optical fibre (5), lens (6) and the optical filtering (7) that sets gradually along the direction of propagation of light;
The laser that sends from 915nm semiconductor laser diode (1) is coupled into double-clad photon crystal optical fibre (5) after focusing on through first planoconvex spotlight (2), dichroic mirror (3), second planoconvex spotlight (4) collimation successively; 980nm laser and remaining 915nm pump light see through second planoconvex spotlight (4) respectively and obtain the output of 980nm laser with dichroic mirror (3), lens (6) with optical filtering (7) optical filtering from the both ends of the surface outgoing of double-clad photon crystal optical fibre.
2. 980nm double-clad photon crystal optical fibre laser according to claim 1 is characterized in that: above-mentioned 915nm semiconductor laser diode (1) has tail optical fiber (8).
3. 980nm double-clad photon crystal optical fibre laser according to claim 1 is characterized in that: described dichroic mirror (3) is high thoroughly to 915nm light, 980nm light is high anti-, plays filter action.
4. 980nm double-clad photon crystal optical fibre laser according to claim 1 is characterized in that: described optical filtering (7) is high saturating for being coated with 980nm, the Multicolour mirror of the high anti-and 1030～1100nm high-reflecting film of 915～946nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200895210U CN202059039U (en) | 2011-03-30 | 2011-03-30 | Double cladding photonic crystal fiber laser of 980nm |
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| CN2011200895210U CN202059039U (en) | 2011-03-30 | 2011-03-30 | Double cladding photonic crystal fiber laser of 980nm |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545702A (en) * | 2013-10-11 | 2014-01-29 | 山东海富光子科技股份有限公司 | Novel single-frequency pulse blue laser light source based on 978nm single-frequency pulse fiber laser |
| CN108574196A (en) * | 2018-03-20 | 2018-09-25 | 苏州十方生物科技有限公司 | A method of optimization Quasi-three level solid state laser device transfer efficiency |
| WO2022000419A1 (en) * | 2020-07-02 | 2022-01-06 | 华为技术有限公司 | Laser system |
| CN113904207A (en) * | 2021-09-26 | 2022-01-07 | 中国科学院上海光学精密机械研究所 | Large-mode-field photonic crystal fiber amplifier and preparation method thereof |
-
2011
- 2011-03-30 CN CN2011200895210U patent/CN202059039U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545702A (en) * | 2013-10-11 | 2014-01-29 | 山东海富光子科技股份有限公司 | Novel single-frequency pulse blue laser light source based on 978nm single-frequency pulse fiber laser |
| CN108574196A (en) * | 2018-03-20 | 2018-09-25 | 苏州十方生物科技有限公司 | A method of optimization Quasi-three level solid state laser device transfer efficiency |
| WO2022000419A1 (en) * | 2020-07-02 | 2022-01-06 | 华为技术有限公司 | Laser system |
| CN114982077A (en) * | 2020-07-02 | 2022-08-30 | 华为技术有限公司 | Laser system |
| CN113904207A (en) * | 2021-09-26 | 2022-01-07 | 中国科学院上海光学精密机械研究所 | Large-mode-field photonic crystal fiber amplifier and preparation method thereof |
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Granted publication date: 20111130 Termination date: 20130330 |