CN101859974A - Narrow linewidth thulium-doped fiber laser - Google Patents
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Abstract
The invention discloses a narrow linewidth thulium-doped fiber laser and belongs to the technical field of thulium-doped fiber lasers. The narrow linewidth thulium-doped fiber laser comprises a pumping source, a thulium-doped fiber, a pumping light focusing lens, a color selective mirror, a laser collimation lens, and two reflecting volume Bragg grating (hereinafter referred to as VBG). By adopting the angle tuning mode on the VBG, the reflectance spectrum parts of two VBGs are overlapped, and the aim of narrowing the linewidth of the thulium-doped fiber laser is fulfilled. The narrow linewidth thulium-doped fiber laser has the advantages that: the fiber laser is applied to laser oscillators taking various fibers (comprising large-mode multimode fiber, photonic crystal fiber, and the like) as gain media, and laser oscillators with the power level of hectowatt, even kilowatt stage can be realized; the narrowing degree of the linewidth depends on the design of the VBG, and the operation in a single longitudinal mode can be realized.
Description
Technical field
The present invention relates to a kind of laser, specifically is a kind of narrow cable and wide optical fiber laser.
Background technology
The linear-cavity optical fiber laser is because effects of spatial, can't obtain single longitudinal mode output by mode competition, mostly be many longitudinal mode runnings, realize the operation of linear cavity fiber laser narrow linewidth, need to adopt suitable arrowband frequency-selecting device, the stability of laser output wavelength also is one of important parameter of narrow cable and wide optical fiber laser.
At present, realize that the mode that the thulium-doped fiber laser narrow linewidth is exported mainly contains two kinds: utilize Fiber Bragg Grating FBG (FBG) or utilize the spectrum narrowing element of common diffraction grating as resonant cavity.Though FBG can carry out welding with doped fiber, realize full fibre system, but it is not suitable for the big mould field fiber laser of high power operation, the laser output power level that FBG narrows has only the milliwatt magnitude usually, and no matter is that to utilize means such as temperature or stress all can't carry out wide wavelength range tuning.Common diffraction grating can be applicable to the high power operation condition, but utilizes narrowing of this element laser linewidth to be difficult to realize being lower than 0.5nm, and owing to need the collimated light beam of large-size, it is heavy and loaded down with trivial details that the laser exocoel often seems.
Recent years, the application of body Bragg grating (volume Bragg grating is called for short VBG) in Optical Maser System attracted people's attentiveness gradually.Select and the spectrum narrowing element as wavelength, VBG has been applied to the narrow linewidth output facet of semiconductor laser, optical parametric oscillator, solid state laser and fiber laser at present.Its power output level has reached the hectowatt magnitude.Its structural principle as shown in Figure 1, with broadband deielectric-coating high reflection mirror 10 as end mirror, the positive feedback of the laser that broadband deielectric-coating high reflective mirror 10 is realized, but the spectral width broad of the laser of output.
Summary of the invention
The objective of the invention is to above-mentioned deficiency, a kind of narrow cable and wide optical fiber laser is provided at prior art.Realize the technical scheme of thulium-doped fiber laser narrow linewidth output, two VBG be used in combination that the laser of output has narrower live width, and tuning simple, can realize high power operation.
The present invention realizes with following technical scheme: a kind of narrow linewidth thulium-doped fiber laser, comprise first pumping source, the second pumping source both-end pumping, on the output light path of first pumping source, set gradually the first pump light condenser lens, first dichronic mirror and thulium doped fiber are coupled into an end of thulium doped fiber by the pump light of the first pump light condenser lens and first dichronic mirror; On the output light path of second pumping source, set gradually the second pump light condenser lens, second dichronic mirror and thulium doped fiber, be coupled into the other end of thulium doped fiber by the pump light of the second pump light condenser lens and second dichronic mirror, realize both-end pumping thulium doped fiber; After thulium doped fiber absorbs the energy of first pumping source and the second pumping source radiation, form population inversion and distribute Tm
3+At energy level
3H
6～
3H
4Between transition, the stimulated radiation that produces 2 micron waveband scopes, the vibration by resonant cavity is amplified and is formed stable laser again; First dichronic mirror and second dichronic mirror are placed respectively at angle at 45, the two ends of thulium doped fiber, are exported through output laser alignment lens by the first dichronic mirror laser light reflected; It is characterized in that: the resonator surface reflecting element that is provided with feedback end laser alignment lens and forms towards the vertical optical path of second dichronic mirror by the first reflective body Bragg grating VBG1 and the second reflective body Bragg grating VBG2; Described two reflective body Bragg gratings obtain identical reflection wavelength by tuning, the laser radiation of process feedback end laser alignment lens is to angled VBG2, through VBG2 laser light reflected normal incidence to VBG1, by VBG1 VBG2 reflected back original optical path is passed through in the normal reflection of light again, realize the angle tuning of VBG1 and VBG2, realize the narrow linewidth of thulium-doped fiber laser.
The invention has the beneficial effects as follows: narrow line width regulatable laser aid simplicity of design proposed by the invention, insert that loss is little, efficient is high, be applicable to high power operation, and the degree of narrowing of live width depends on the design of VBG and the length of used optical fiber, can realize the single longitudinal mode operation behind the VBG of employing optimal design and the short fiber gain media.
Description of drawings
Fig. 1 is the thulium doped optical fiber laser cavity resonator structure schematic diagram of broadband deielectric-coating high reflection mirror as end mirror.
The thulium-doped fiber laser structural representation that Fig. 2 narrows for two VBG.
Fig. 3 is the narrow principle schematic of laser spectroscopy of two VBG.
Fig. 4 is that two VBG or broadband deielectric-coating high reflection mirror compare as the output laser spectroscopy of resonator surface reflecting element respectively.
The spectral line width that two VBG that Fig. 5 writes down for the F-P scanning interferometer narrow.
Fig. 6 is that two VBG or broadband deielectric-coating high reflection mirror compare as the power output and the oblique efficient of resonator surface reflecting element respectively.
Among the figure: 1, first pumping source; 2, second pumping source; 3, the first pump light condenser lens; 4, the second pump light condenser lens; 5, first dichronic mirror; 6, second dichronic mirror; 7, thulium doped fiber; 8, output laser alignment lens; 9, feedback end laser alignment lens; 10, broadband deielectric-coating high reflection mirror; 11, the first reflective body Bragg grating VBG1; 12, the second reflective body Bragg grating VBG2.
Embodiment
As shown in Figure 2, narrow linewidth thulium-doped fiber laser has first pumping source 1, second pumping source, 2 both-end pumpings, on the output light path of first pumping source 1, set gradually the first pump light condenser lens 3, first dichronic mirror 5 and thulium doped fiber 7 are coupled into an end of thulium doped fiber 7 by the pump light of the first pump light condenser lens 3 and first dichronic mirror 5; On the output light path of second pumping source 2, set gradually the second pump light condenser lens 4, second dichronic mirror 6 and thulium doped fiber 7, be coupled into the other end of thulium doped fiber 7 by the pump light of the second pump light condenser lens 4 and second dichronic mirror 6, realize both-end pumping thulium doped fiber 7; After thulium doped fiber 4 absorbs the energy of first pumping source 1 and 2 radiation of second pumping source, form population inversion and distribute Tm
3+At energy level
3H
6～
3H
4Between transition, the stimulated radiation that produces 2 micron waveband scopes, the vibration by resonant cavity is amplified and is formed stable laser again; First dichronic mirror 5 and second dichronic mirror 6 are placed respectively at angle at 45, the two ends of thulium doped fiber 7, are exported through output laser alignment lens 8 by first dichronic mirror, 5 laser light reflected; The resonator surface reflecting element that is provided with feedback end laser alignment lens 9 and forms towards the vertical optical path of second dichronic mirror 6 by the first reflective body Bragg grating VBG111 and the second reflective body Bragg grating VBG212; Promptly replace broadband deielectric-coating high reflective mirror 10 among Fig. 1 as thulium-doped fiber laser resonator surface reflecting element by two individual Bragg gratings.The requirement of these two gratings is: obtain identical reflection wavelength by tuning.The body Bragg grating is that the photo-thermal refractive index glass by a kind of particular components is made, and absolute diffraction efficiency surpasses 99%, and temperature stability is up to 400 ℃, and paired pulses involves continuous wave laser irradiation and all has tolerance preferably.This body Bragg grating provides narrow spectrum, the minimum 20pm that reaches, and narrow angle Selection minimum reaches 100 μ rad.Described two reflective body Bragg gratings must obtain identical reflection wavelength by tuning; The laser radiation of process feedback end laser alignment lens 9 is to angled VBG212, through VBG212 laser light reflected normal incidence to VBG111, by VBG111 VBG212 reflected back original optical path is passed through in the normal reflection of light again, realize the angle tuning of VBG111 and VBG212, realize the narrow linewidth of thulium-doped fiber laser.
Test the first used pumping source 1 and second pumping source 2 is a semiconductor laser, output optical maser wavelength is 792nm.The focal length of the first pump light condenser lens 3 and the second pump light condenser lens 4 is 20mm.First dichronic mirror 5 and second dichronic mirror 6 are in the high transmission of 780nm-803nm wave-length coverage, in the high reflection of 1800nm-2050nm wave-length coverage, the fibre core of thulium doped fiber 7 and the diameter of inner cladding are respectively 25 microns and 300 microns, numerical aperture is respectively 0.17 and 0.46, and the length of used thulium doped fiber 7 is 4.8m.The focal length of output laser alignment lens 8 is 30mm.The focal length of feedback end laser alignment lens 9 is 15mm, and is corresponding with the dimensions of VBG212 and VBG111.The reflection wavelength difference of two VBG that the present invention is used, the reflection kernel wavelength of described VBG111 and VBG212 is respectively 1989.7nm and 1999.7nm, and diffraction efficiency is all greater than 99%, and spectral width is that half-wave bandwidth (FWHM) is respectively 0.65nm and 0.76nm.Thickness is respectively 10.89mm and 10.95mm, and plane of incidence size all is 10 * 6mm.Change the incident angle of VBG2, its reflection wavelength can be adjusted near the 1989.7nm.
Because the reflection wavelength difference of two VBG, need earlier with wavelength long VBG2 reflection wavelength be tuned near the reflection wavelength of VBG1, the reflectance spectrum of two VBG is overlapped, as shown in Figure 3.Use two VBG and narrow after the technology, the laser output spectrum is narrowed greatly, as shown in Figure 4.Utilize the F-P scanning interferometer to measure the actual spectrum width and be about 2pm (as shown in Figure 5).Simultaneously, we have distinguished experiment measuring two VBG and broadband deielectric-coating high reflection mirror is subjected to the restriction of pumping source power level as the power output of resonator surface reflecting element, and the maximum power output that experiment is obtained is 113W.From Fig. 6, under two kinds of experimental provisions, its output laser does not all have significant difference at aspects such as threshold level, maximum power output and oblique efficient, illustrates that two VBG proposed by the invention technology that narrows only brings minimum insertion loss.
Through a large amount of experimental verifications, by VBG being adopted the mode of angle tuning, the reflectance spectrum of two VBG is overlapped, reach the purpose of the output laser linewidth of the thulium-doped fiber laser that narrows.The present invention is applicable to that each sharp optical fiber (comprising big mould field multimode fiber, photonic crystal fiber etc.) as the laser oscillator of gain media, can realize the laser oscillator of hectowatt even kilowatt magnitude power level.Narrow line width regulatable laser aid simplicity of design, insert that loss is little, efficient is high, be applicable to high power operation, and the degree of narrowing of live width depends on the design of VBG and the length of used optical fiber, can realize the single longitudinal mode operation behind the VBG of employing optimal design and the short fiber gain media.
In addition,, the reflectance spectrum of a plurality of VBG is overlapped, thereby control the thulium-doped fiber laser output spectral width, reach the purpose of the live width of the thulium doped fiber that further narrows by a plurality of VBG being adopted the mode of angle tuning.Be applicable to that various optical fiber (comprising big mould field multimode fiber, photonic crystal fiber etc.) as the laser oscillator of gain media, can realize the laser oscillator of hectowatt even kilowatt magnitude power level.
Claims (9)
1. narrow linewidth thulium-doped fiber laser, comprise first pumping source (1), second pumping source (2) both-end pumping, on the output light path of first pumping source (1), set gradually the first pump light condenser lens (3), first dichronic mirror (5) and thulium doped fiber (7) are coupled into an end of thulium doped fiber (7) by the pump light of the first pump light condenser lens (3) and first dichronic mirror (5); On the output light path of second pumping source (2), set gradually the second pump light condenser lens (4), second dichronic mirror (6) and thulium doped fiber (7), be coupled into the other end of thulium doped fiber (7) by the pump light of the second pump light condenser lens (4) and second dichronic mirror (6), realize both-end pumping thulium doped fiber (7); After thulium doped fiber (4) absorbs the energy of first pumping source (1) and second pumping source (2) radiation, form population inversion and distribute Tm
3+At energy level
3H
6～
3H
4Between transition, the stimulated radiation that produces 2 micron waveband scopes, the vibration by resonant cavity is amplified and is formed stable laser again; First dichronic mirror (5) and second dichronic mirror (6) are placed respectively at angle at 45, the two ends of thulium doped fiber (7), are exported through output laser alignment lens (8) by first dichronic mirror (5) laser light reflected; It is characterized in that: the resonator surface reflecting element that is provided with feedback end laser alignment lens (9) and forms towards the vertical optical path of second dichronic mirror (6) by the first reflective body Bragg grating VBG1 (11) and the second reflective body Bragg grating VBG2 (12); Described two reflective body Bragg gratings obtain identical reflection wavelength by tuning, arrive on the angled VBG2 (12) through the laser radiation of feedback end laser alignment lens (9), arrive on the VBG1 (11) through VBG2 (12) laser light reflected normal incidence, by VBG1 (11) VBG2 (12) reflected back original optical path is passed through in the normal reflection of light again, realize the angle tuning of VBG1 (11) and VBG2 (12), realize the narrow linewidth of thulium-doped fiber laser.
2. narrow linewidth thulium-doped fiber laser according to claim 1 is characterized in that, described first pumping source (1) and second pumping source (2) are semiconductor laser, and output optical maser wavelength is 792nm.
3. narrow linewidth thulium-doped fiber laser according to claim 1 is characterized in that, the focal length of the described first pump light condenser lens (3) and the second pump light condenser lens (4) is 20mm.
4. narrow linewidth thulium-doped fiber laser according to claim 1 is characterized in that, described first dichronic mirror (5) and second dichronic mirror (6) are in the high transmission of 780nm-803nm wave-length coverage, in the high reflection of 1800nm-2050nm wave-length coverage.
5. narrow linewidth thulium-doped fiber laser according to claim 1, it is characterized in that, the fibre core of described thulium doped fiber (7) and the diameter of inner cladding are respectively 25 microns and 300 microns, and numerical aperture is respectively 0.17 and 0.46, and the length of used thulium doped fiber (7) is 4.8m.
6. narrow linewidth thulium-doped fiber laser according to claim 1 is characterized in that, the focal length of described output laser alignment lens (8) is 30mm.
7. narrow linewidth thulium-doped fiber laser according to claim 1 is characterized in that, the focal length of described feedback end laser alignment lens (9) is 15mm, and is corresponding with the dimensions of VBG2 (12) and VBG1 (11).
8. narrow linewidth thulium-doped fiber laser according to claim 2, it is characterized in that, the reflection kernel wavelength of described VBG1 (11) and VBG2 (12) is respectively 1989.7nm and 1999.7nm, half-wave bandwidth (FWHM) is respectively 0.65nm and 0.76nm, thickness is respectively 10.89mm and 10.95mm, and plane of incidence size all is 10 * 6mm.
9. narrow linewidth thulium-doped fiber laser according to claim 1, it is characterized in that the mode by a plurality of VBG are adopted angle tuning is overlapped the reflectance spectrum of a plurality of VBG, thereby control the thulium-doped fiber laser output spectral width, reach the live width of the thulium doped fiber that further narrows.
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| CN 201010204385 CN101859974A (en) | 2010-06-12 | 2010-06-12 | Narrow linewidth thulium-doped fiber laser |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299475A (en) * | 2011-07-21 | 2011-12-28 | 西北大学 | Narrow-linewidth single-transverse mode hundred watt level 2 micron thulium doped fiber laser with all-fiber structure |
| CN103762488A (en) * | 2014-01-15 | 2014-04-30 | 江苏师范大学 | High power narrow linewidth tunable laser |
| CN105119135A (en) * | 2015-06-25 | 2015-12-02 | 中国科学院西安光学精密机械研究所 | 1.75 mu m narrow linewidth thulium-doped optical fiber laser |
| CN108418089A (en) * | 2018-05-14 | 2018-08-17 | 南京晓庄学院 | A kind of high power single longitudinal mode mixes holmium solid state laser |
| CN109103737A (en) * | 2018-10-31 | 2018-12-28 | 深圳技术大学（筹） | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength |
| WO2020031475A1 (en) * | 2018-08-08 | 2020-02-13 | 浜松ホトニクス株式会社 | External resonator-type semiconductor laser device |
| CN112964181A (en) * | 2021-03-29 | 2021-06-15 | 中南大学 | Optical fiber Bragg grating position detection device and measurement method thereof |
| CN113285348A (en) * | 2021-05-20 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Single-chip narrow-linewidth semiconductor laser and preparation method thereof |
| CN113594842A (en) * | 2021-05-31 | 2021-11-02 | 盐城工学院 | Device and method for generating ultrashort pulse of erbium-doped laser |
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| CN1776974A (en) * | 2005-11-29 | 2006-05-24 | 胡姝玲 | Short-pulse ytterbium-doped double-cladded-layer optical fiber laser |
| CN1972035A (en) * | 2006-12-13 | 2007-05-30 | 北京航空航天大学 | A linear resonant cavity wide narrow line tunable optical fiber laser |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299475B (en) * | 2011-07-21 | 2012-08-08 | 西北大学 | Narrow-linewidth single-transverse mode hundred watt level 2 micron thulium doped fiber laser with all-fiber structure |
| CN102299475A (en) * | 2011-07-21 | 2011-12-28 | 西北大学 | Narrow-linewidth single-transverse mode hundred watt level 2 micron thulium doped fiber laser with all-fiber structure |
| CN103762488A (en) * | 2014-01-15 | 2014-04-30 | 江苏师范大学 | High power narrow linewidth tunable laser |
| CN103762488B (en) * | 2014-01-15 | 2016-03-30 | 江苏师范大学 | High power narrow line width regulatable laser |
| CN105119135A (en) * | 2015-06-25 | 2015-12-02 | 中国科学院西安光学精密机械研究所 | 1.75 mu m narrow linewidth thulium-doped optical fiber laser |
| CN108418089A (en) * | 2018-05-14 | 2018-08-17 | 南京晓庄学院 | A kind of high power single longitudinal mode mixes holmium solid state laser |
| JP7142512B2 (en) | 2018-08-08 | 2022-09-27 | 浜松ホトニクス株式会社 | External cavity type semiconductor laser device |
| WO2020031475A1 (en) * | 2018-08-08 | 2020-02-13 | 浜松ホトニクス株式会社 | External resonator-type semiconductor laser device |
| JP2020025039A (en) * | 2018-08-08 | 2020-02-13 | 浜松ホトニクス株式会社 | External resonator type semiconductor laser device |
| CN109103737A (en) * | 2018-10-31 | 2018-12-28 | 深圳技术大学（筹） | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength |
| CN112964181A (en) * | 2021-03-29 | 2021-06-15 | 中南大学 | Optical fiber Bragg grating position detection device and measurement method thereof |
| CN113285348A (en) * | 2021-05-20 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Single-chip narrow-linewidth semiconductor laser and preparation method thereof |
| CN113594842A (en) * | 2021-05-31 | 2021-11-02 | 盐城工学院 | Device and method for generating ultrashort pulse of erbium-doped laser |
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