CN101202407A - Switching optical fibre laser on frequency - Google Patents
Switching optical fibre laser on frequency Download PDFInfo
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- CN101202407A CN101202407A CNA2007100322772A CN200710032277A CN101202407A CN 101202407 A CN101202407 A CN 101202407A CN A2007100322772 A CNA2007100322772 A CN A2007100322772A CN 200710032277 A CN200710032277 A CN 200710032277A CN 101202407 A CN101202407 A CN 101202407A
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Abstract
The invention discloses a frequency up-conversion fiber laser, comprising a pumping source 1, a temperature control system 3, a collimation focusing lens group 5, an input coupling lens 7, an output coupling lens 8 and a rare earth mixed fiber 9; wherein, the pumping source 1 outputs stably a pumping laser through the temperature control system 3; the pumping laser is focalized through the collimation lens group 5, permeates the input coupling lens 7 and is coupled into the rare earth mixed fiber 9 to generate a frequency up-conversion laser part which is output through the output coupling lens 8; the input coupling lens 7 and/or the output coupling lens 8 of the frequency up-conversion fiber laser can be replaced by a fiber grating 14. Alternatively, a pumping source 2 and a dichroic beamsplitter 10 can be adopted on the other end surface of the fiber, so as to lead the dichroic beamsplitter 10 to form an angle of 45 DEG with an optical axis. The invention has the advantages of high laser efficiency, a plurality of wavelengths which are output by the laser, and being beneficial for the output of visible light (especially for blue green light) and laser with different wavelengths at the same time and for the miniaturization and integration of devices.
Description
Technical field
The present invention relates to a kind of fiber laser, particularly a kind of switching optical fibre laser on frequency.
Background technology
Along with technology rapid development such as high density data storage, three-dimensional display, submarine communication, Fibre Optical Sensor, laser medicines, more and more need high efficiency, low price, high performance visible light short wavelength's LASER Light Source, particularly blue-green laser source.
The method that obtains laser output for the blue green light solid state laser mainly contains following several: (1) directly utilizes wide bandgap semiconductor materials directly to excite; (2) utilize the frequency-doubling method of nonlinear optical crystal; (3) utilize the up-conversion luminescence of rare earth ion doped material.Also there is a series of technical problem in semiconductor laser diode (LD) for visible waveband, and beam quality is not fully up to expectations simultaneously, is restricted in many applications; And, need complicated non-linear parameter process carry out frequency inverted by the frequency multiplication solid state laser of LD pumping, and though beam quality is fine, system is complicated, cost is very high.Typical bluish-green band laser is an argon ion laser at present, and output wavelength is 488.0nm and 514.5nm.This gas laser exists that volume is big, the life-span is short and the shortcoming of job insecurity, and it is by continuation mode work, is difficult to utilize laser modulation technique to obtain high peak power.
Utilize switch technology on the frequency, can obtain bluish-green laser output with the rare-earth-ion-doped crystal of near-infrared LD pumping, glass or optical fiber.Compare with rear-earth-doped crystal, rear-earth-doped glass and optical fiber have following advantage: (1) does not need strict phase matched, the Doped Rare Earth ion has formed the Stark division of rare earth ion energy level owing to the constraint that is subjected to the lattice electric field in host glass, simultaneously between these splitted levels because the generation of phonon causes energy exchange with burying in oblivion, thereby caused these energy levels evenly or inhomogeneous broadening.Thereby it is not high to the stability requirement of excitation wavelength; (2) because the rare earth ion energy level is abundant, laser output wavelength is many; (3) output wavelength has certain tunability.Utilize the phenomenon of rare earth ion energy level broadening in glass, the method that employing combines with fiber grating or reflecting cavity mirror can realize laser tuning output.In addition, utilize and to mix rare earth glass optical fiber and realize that short wavelength laser output more helps making simple in structure, cheap miniature laser.By vitreous material is drawn into optical fiber, can make pump light be limited in a limited zone, under long fiber lengths, realize higher population inversion, and then realize stronger up-conversion luminescence.And,, can realize high-power laser output by carry out the cladding pumping technology of semiconductor laser array at the optical fiber two ends.
In addition, the switch technology fiber laser is compared with semiconductor laser on the frequency, has extremely low laser output threshold value, higher laser slope efficiency.The laser output wavelength covering wide, advantage such as output laser has high brightness, and mode quality is good, and wavelength, temperature stability are good.
Summary of the invention
The invention provides a kind of switching optical fibre laser on frequency, utilize rare earth ion, realize the conversion of glow frequency in metastable state long fluorescence lifetime and optical fiber its specific structure.Switching optical fibre laser on frequency of the present invention can produce the emission of visible wavelength (especially blue green light) laser.
Concrete technical solution of the present invention is as follows:
Switching optical fibre laser on frequency of the present invention, comprise pumping source 1, temperature control system 3, collimation focus lens group 5, input coupling mirror 7, output coupling mirror 8, rare-earth doped optical fibre 9, wherein, pumping source 1 is through the pumping laser of temperature control system 3 stable outputs, see through input coupling mirror 7 and be coupled into rare-earth doped optical fibre 9 after collimation focus lens group 5 focuses on, the frequency up-conversion lasing of generation partly sees through output coupling mirror 8 outputs.
Described rare-earth doped optical fibre 9 is the optical fiber with little phonon energy, comprises germanate glass optical fiber, tellurate glass optical fiber, fluoride and chalcogenide glass optical fiber or single crystal fiber.
The structure of described rare-earth doped optical fibre 9 is fiber filaments, single cladded fiber, doubly clad optical fiber, multi-clad or the photonic crystal fiber that has little pore.
Described rare-earth doped optical fibre 9 erbium doped, praseodymium, thulium, holmium, neodymium, erbium and ytterbium mixture or praseodymium and ytterbium mixture.
The inner cladding end face of described rare-earth doped optical fibre 9 is D shape, square, rectangle or quincunx.
Described input coupling mirror 7 and output coupling mirror 8 are one or more combinations in plane dichroscope, concave surface dichroscope, the convex surface dichroscope.
The input coupling mirror 7 of conversion optical fiber laser and/or output coupling mirror 8 can also be substituted by fiber grating 14 on the said frequencies.
Described fiber grating 14 is fused on the rare-earth doped optical fibre by fusing mode, or directly writes grating by position phase mask means or holography method on described rare-earth doped optical fibre 9.
Conversion optical fiber laser can also adopt pumping source 2 and dichroic beamsplitter 10 on the said frequencies in the optical fiber other end, makes dichroic beamsplitter 10 and optical axis angle at 45.
This invention has following advantage: the efficient height, realize the high several magnitude of short wavelength laser delivery efficiency than frequency doubling technology; The multiple rare earth ion that can mix as er-doped, is mixed praseodymium, mixes thulium, mixes holmium, neodymium-doped, and erbium, ytterbium mix altogether, praseodymium, ytterbium are mixed altogether, or the like, so laser output wavelength is many, output when helping different wave length visible light (especially blue green light) laser.Simultaneously, mix photosensitive element again,, be convenient to directly in laser fiber, write grating, form all optical fibre structure tunable laser, help miniaturization of devices and integrated as germanium, tin, boron etc. by welding or in rare-earth ion-doped fiber core.
Description of drawings
Fig. 1 is the structural representation of the switching optical fibre laser on frequency of employing two directional pump.
Fig. 2 is the structural representation of the switching optical fibre laser on frequency of the unidirectional pumping of employing.
Fig. 3 is for adopting the structural representation of Fiber Bragg Grating FBG as the switching optical fibre laser on frequency of output coupling mirror.
Embodiment
The invention will be further described below by specific embodiment, but should not limit protection scope of the present invention with this.
Fig. 1 is one of structural representation of switching optical fibre laser on frequency of the present invention.Wherein pumping source 1 is a semiconductor laser that output wavelength is 976nm, and this pumping laser enters one section Er/Yb by 5 focusing of collimation focus lens group and mixes altogether in the germanate glass doubly clad optical fiber; Pumping source 2 is the semiconductor lasers that output wavelength is 803nm, and this pumping laser is by collimation lens set 6, and line focus lens 11 focus on and enter in the optical fiber again.The focal length of condenser lens 11 is 5cm, is convenient to dichroic beamsplitter 10 as far as possible near output coupling mirror 8.Input coupling mirror 7 is to the high transmission of 976nm pumping laser, to the high average dichroscope that reflects of 545nm signal laser, dichroic beamsplitter 10 and optical axis angle at 45 approximately, 803nm laser height to pumping source 2 sees through, to the high reflection of 545nm signal laser of output, output coupling mirror 8 is for to the high transmission of 803nm pumping laser, to 545nm signal laser transmitance being 15% plano-concave dichroscope.When the output pumping laser of two pumping sources reaches certain power, in the resonant cavity of input coupling mirror 7 and output coupling mirror 8 formation, thereby pump light inner cladding repeatedly total reflection repeatedly pass through fibre core, rare earth ion produces the green laser of 545nm by up-conversion luminescence mechanism such as excited state absorption, energy transfer, photon avalanches.The laser of output enters detection system 13 again through dichroic beamsplitter 10 reflections behind collimating mirror 12 collimations.Realize the tuning of optical maser wavelength by adjusting chamber mirror 7 or 8, tuning range can be from 520nm to 560nm.
In this structure, germanate glass optical fiber can be substituted by the less optical fiber of phonon energy, as: fluoride glass optical fiber, tellurate glass optical fiber, germanate glass optical fiber and crystal fiber etc.The structure of optical fiber can be fiber filaments (having only fibre core not have covering), single cladded fiber, doubly clad optical fiber or multi-clad, can also be the photonic crystal fiber that has little pore.Rare-earth doped optical fibre 9 can erbium doped, praseodymium, thulium, holmium, neodymium, erbium and ytterbium mixture or praseodymium and ytterbium mixture.Its inner cladding end face is D shape, square, rectangle or quincunx.The use of multi-clad helps improving the pump light coupling efficiency, has strengthened Laser emission intensity.Singly mix Er ion or Er/Yb co-doped fiber by structure pumping shown in Figure 1, all can realize green laser output.
Select for use dichroscope as input, output coupling mirror among the present invention, constitute resonant cavity, make that upward conversion optical fiber laser is simple in structure, with low cost.
The present invention also can adopt the solution of unidirectional pumping, as shown in Figure 2.It comprises: pumping source 1, temperature control system 3, collimation focus lens group 5, input coupling mirror 7, output coupling mirror 8, rare-earth doped optical fibre 9, collimating mirror 12, detection system 13.The relation of each parts is: pumping source 1 is through the pumping laser of temperature control system 3 stable outputs, after collimation focus lens group 5 focuses on, see through input coupling mirror 7 and be coupled into rare-earth doped optical fibre 9, the contacting end face and should be close to of described input coupling mirror 7 and rare-earth doped optical fibre 9, the visible light of generation (especially blue green light) laser part sees through output coupling mirror 8 and enter detection system 13 behind collimating mirror 12 collimation.
When pumping source 1 powered up, the pump light wavelength of regulating the pumping source emission by temperature control system was corresponding with the optical fiber core material absorbing wavelength, by the collimation focusing system pump light was coupled into fibre core.Rare earth ion produces visible light (especially blue green light) laser by up-conversion luminescence mechanism such as excited state absorption, energy transfer, photon avalanches.The laser of output enters detection system behind the collimating mirror collimation.
The present invention adopts the solution of Fiber Bragg Grating FBG as output coupling mirror, as shown in Figure 3.It comprises: pumping source 1, temperature control system 3, collimation focus lens group 5, input coupling mirror 7, Fiber Bragg Grating FBG 14, rare-earth doped optical fibre 9, collimating mirror 12, detection system 13.The relation of each parts is: pumping source 1 is through the pumping laser of temperature control system 3 stable outputs, after collimation focus lens group 5 focuses on, see through input coupling mirror 7 and be coupled into rare-earth doped optical fibre 9, the contacting end face and should be close to of described input coupling mirror 7 and rare-earth doped optical fibre 9, the visible light of generation (especially blue green light) laser part sees through Fiber Bragg Grating FBG 14 and enter detection system 13 behind collimating mirror 12 collimation.
Fine Bragg grating 14 can be fused on the rare-earth doped optical fibre 9 by fusing mode, also can directly write grating by position phase mask means or holography method on described rare-earth doped optical fibre.Because the reflection of the wavelength selectivity of Fiber Bragg Grating FBG, the laser of narrowband of output enters detection system behind the collimating mirror collimation.
Fiber Bragg Grating FBG can be realized tuning output by tunable technologies such as electric tuning, axial compression method, simply supported beam tuning methods.
Claims (10)
1. switching optical fibre laser on frequency, comprise pumping source (1), temperature control system (3), collimation focus lens group (5), input coupling mirror (7), output coupling mirror (8), rare-earth doped optical fibre (9), it is characterized in that, described pumping source (1) is through the pumping laser of the stable output of temperature control system (3), see through input coupling mirror (7) and be coupled into rare-earth doped optical fibre (9) after collimation focus lens group (5) focuses on, the frequency up-conversion lasing of generation partly sees through output coupling mirror (8) output.
2. switching optical fibre laser on frequency according to claim 1, it is characterized in that: described rare-earth doped optical fibre (9) is the optical fiber with little phonon energy, comprises germanate glass optical fiber, tellurate glass optical fiber, fluoride and chalcogenide glass optical fiber or single crystal fiber.
3. switching optical fibre laser on frequency according to claim 1 is characterized in that: the structure of described rare-earth doped optical fibre (9) is fiber filaments, single cladded fiber, doubly clad optical fiber, multi-clad or the photonic crystal fiber that has little pore.
4. switching optical fibre laser on frequency according to claim 1 is characterized in that: described rare-earth doped optical fibre (9) erbium doped, praseodymium, thulium, holmium, neodymium, erbium and ytterbium mixture or praseodymium and ytterbium mixture.
5. switching optical fibre laser on frequency according to claim 1 is characterized in that: the inner cladding end face of described rare-earth doped optical fibre (9) is D shape, square, rectangle or quincunx.
6. switching optical fibre laser on frequency according to claim 1 is characterized in that: described input coupling mirror (7) and output coupling mirror (8) are one or more combinations in plane dichroscope, concave surface dichroscope, the convex surface dichroscope.
7. the input coupling mirror (7) of the described switching optical fibre laser on frequency of claim 1 and/or output coupling mirror (8) are substituted by fiber grating (14).
8. switching optical fibre laser on frequency according to claim 7, it is characterized in that: described fiber grating (14) is fused on the rare-earth doped optical fibre by fusing mode, or directly upward writes grating by position phase mask means or holography method at described rare-earth doped optical fibre (9).
9. the described switching optical fibre laser on frequency of one of claim 1-6 is characterized in that: can also adopt pumping source (2) in the optical fiber other end.
10. the described switching optical fibre laser on frequency of claim 9 is characterized in that: can also adopt dichroic beamsplitter (10), make itself and optical axis angle at 45.
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| CNA2007100322772A CN101202407A (en) | 2007-12-07 | 2007-12-07 | Switching optical fibre laser on frequency |
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| CNA2007100322772A CN101202407A (en) | 2007-12-07 | 2007-12-07 | Switching optical fibre laser on frequency |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976795A (en) * | 2010-09-13 | 2011-02-16 | 吉林大学 | Gadolinium-doped ultraviolet up-conversion fluoride optical fiber and optical fiber laser device |
| CN103296576A (en) * | 2013-05-22 | 2013-09-11 | 哈尔滨工业大学 | Fiber-coupled output diode end-pumped and Tm-doped (thulium-doped) slab solid-state laser |
| CN108039639A (en) * | 2017-12-05 | 2018-05-15 | 中国科学院西安光学精密机械研究所 | The how logical ultra-short pulse laser amplifier of based single crystal optical fiber polarisation control |
| CN109038192A (en) * | 2018-08-29 | 2018-12-18 | 华南理工大学 | Single-frequency blue green light optical fiber laser is converted in one kind |
| WO2021087715A1 (en) * | 2019-11-05 | 2021-05-14 | 南京同溧晶体材料研究院有限公司 | Solid-state laser having high upconversion strength |
| CN115548847A (en) * | 2022-11-29 | 2022-12-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | mJ-level high-repetition-frequency all-fiber femtosecond laser and method |
-
2007
- 2007-12-07 CN CNA2007100322772A patent/CN101202407A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976795A (en) * | 2010-09-13 | 2011-02-16 | 吉林大学 | Gadolinium-doped ultraviolet up-conversion fluoride optical fiber and optical fiber laser device |
| CN103296576A (en) * | 2013-05-22 | 2013-09-11 | 哈尔滨工业大学 | Fiber-coupled output diode end-pumped and Tm-doped (thulium-doped) slab solid-state laser |
| CN103296576B (en) * | 2013-05-22 | 2015-06-10 | 哈尔滨工业大学 | Fiber-coupled output diode end-pumped and Tm-doped (thulium-doped) slab solid-state laser |
| CN108039639A (en) * | 2017-12-05 | 2018-05-15 | 中国科学院西安光学精密机械研究所 | The how logical ultra-short pulse laser amplifier of based single crystal optical fiber polarisation control |
| CN109038192A (en) * | 2018-08-29 | 2018-12-18 | 华南理工大学 | Single-frequency blue green light optical fiber laser is converted in one kind |
| WO2021087715A1 (en) * | 2019-11-05 | 2021-05-14 | 南京同溧晶体材料研究院有限公司 | Solid-state laser having high upconversion strength |
| CN115548847A (en) * | 2022-11-29 | 2022-12-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | mJ-level high-repetition-frequency all-fiber femtosecond laser and method |
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