CN102122790B - Linear polarization acousto-optic modulator Q-switched optical fiber laser with single end coupled with optical fiber - Google Patents
Linear polarization acousto-optic modulator Q-switched optical fiber laser with single end coupled with optical fiber Download PDFInfo
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- CN102122790B CN102122790B CN2011100042886A CN201110004288A CN102122790B CN 102122790 B CN102122790 B CN 102122790B CN 2011100042886 A CN2011100042886 A CN 2011100042886A CN 201110004288 A CN201110004288 A CN 201110004288A CN 102122790 B CN102122790 B CN 102122790B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 65
- 230000010287 polarization Effects 0.000 title claims abstract description 53
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims description 38
- 238000005086 pumping Methods 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000001012 protector Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
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- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
The invention relates to a linear polarization acousto-optic modulator Q-switched optical fiber laser with single end coupled with optical fiber which sequentially comprises a laser diode pump source, a pump protector, a pump coupler, an optical fiber grating, a double-clad doped polarization maintaining optical fiber, an optical fiber port coupling lens, an acousto-optic modulator and a plane mirror. The single-end optical fiber-coupled linear polarization acousto-optic modulator Q-switched optical fiber laser has the characteristics of full-optical fiber modular structuring, adjustable highrepetition rate, output of linearly polarized light pulse with narrow pulse width and narrow line width, compact structure, small volume, good stability, strong practicality and great application prospect.
Description
Technical field
The present invention relates to fiber laser, particularly a kind of sound and light Q adjusting optical fiber laser of linear polarization of single-end optical fiber coupling, this laser are the full-optical-fiber lasers of the high repetition of output, narrow linewidth, narrow pulsewidth (tens nanosecond of pulse duration), high-peak power.
Technical background
The pulse optical fiber of high repetition, high-peak power, narrow pulsewidth, narrow linewidth all has fabulous researching value and great application prospect in fields such as medical treatment, scientific research, military affairs and industrial processes, all is a direction that receives much concern all the time.Require aspects such as higher precision detection, interferometry, imaging demonstration, optical communication, light sensing, optical nonlinearity frequency inverted, laser beam combination, biologic medical diagnosis, needing to use linearly polarized laser.Therefore, the pulse optical fiber of linear polarization has obtained people's favor with its special advantages.Because the fiber gain medium is longer, and there is certain inclined to one side effect of moving back in ordinary optic fibre for linearly polarized light, so optical-fiber laser is difficult for keeping good linear polarization characteristic in oscillatory process.On the other hand, in order to break through of the restriction of conventional solid optics, reach the important trend that integrated system small-sized, compact, good stability also is the fiber laser development through full fiberize to laser system.
Summary of the invention
The present invention is intended to overcome the deficiency of above-mentioned prior art; A kind of linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling is provided; This laser should have full optic module structuring, high repetition is adjustable, exports the linearly polarized light pulse of narrow pulsewidth, narrow linewidth, compact conformation; Volume is little, good stability and practical characteristics.
Technical solution of the present invention is following:
A kind of linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling; Characteristics are that its formation comprises successively: laser diode pumping source, pumping protection device, pumping coupler, fiber grating, double clad doping polarization maintaining optical fibre, fiber port coupled lens, acousto-optic modulator and level crossing; Described fiber grating and level crossing constitute linear F-P cavity configuration; Double clad doping polarization maintaining optical fibre is as gain media; The laser alignment of the double clad polarization maintaining optical fibre being exported through the fiber port coupled lens arrives acousto-optic modulator, and an end of described double clad doping polarization maintaining optical fibre and the coupling of fiber port coupled lens is called rear end face, and this rear end face is worn into Brewster's angle; It is vertical with the fast axle or the slow axis of described double clad doping polarization maintaining optical fibre that the normal of this rear end face keeps; To obtain the linear polarization characteristic, described level crossing is positioned at the first-order diffraction light direction of described acousto-optic modulator to form feedback, and laser is by the end output of the fiber grating of described double clad doping polarization maintaining optical fibre.
The along that is centered close to described fiber port coupled lens of described double clad doping polarization maintaining optical fibre rear end face.
The first-order diffraction light direction of described level crossing and described acousto-optic modulator is perpendicular, to pump light high pass through, laser is high anti-.
Described fiber grating is the fiber grating of double clad, and grating only limits core segment, causes the laser part reflection, and the pump light wavelength is not had influence.
The course of work of the present invention is:
The pump light that laser diode pumping source sends gets into described magnetic tape trailer fine fiber grating through the pumping coupler coupling from left end through the pumping protection device, in double clad doping polarization maintaining optical fibre, produces stimulated radiation laser.Because the existence of the Brewster's angle of an end of gain fibre and fiber port coupled lens; Make linearly polarized light partial reflection, part transmission with the perpendicular direction polarization of this output end face normal; And another polarization direction of quadrature has only transmitted light, does not have reverberation with it; Promptly be equivalent to add decay in various degree, make that the laser that has only transmission on the polarization direction takes the lead in resonant cavity, producing bigger gain, come and go and strengthen two polarization directions.The linearly polarized laser that produces gets into acousto-optic modulator through the fiber port Lens Coupling; Come the loss in the periodic modulation chamber by acousto-optic modulator; After flat mirror reflects, be coupled into gain fibre once more, at last through fiber grating, thereby the Q impulse of having realized the linearly polarized light fibre laser is exported.
Technique effect of the present invention:
The present invention introduces the single-end optical fiber port and level crossing stuck-module structure shortens chamber length, reduced system bulk; And use first-order diffraction light is as the feedback of Q-switch laser in the chamber; Make fiber laser simple, compact; Avoid extra insertion loss, improved the stability and the efficient of output pulse laser; Adopt Brewster's angle to come control chamber inner laser polarization characteristic; Greatly guaranteed the linear polarization characteristic of pulse laser; Realized a kind of linear polarization pulse optical fiber of full optic module structure thus, its structure is compact flexibly, and high repetition is adjustable; Export the linear polarization pulse of narrow pulsewidth, narrow linewidth, satisfied the demand of various application occasions.
Description of drawings
Fig. 1 is the structural representation of the linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling of the present invention;
Sectional view when Fig. 2 becomes Brewster's angle for fiber end face of the present invention.
Embodiment
See also Fig. 1, Fig. 1 is the structural representation of the linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling of the present invention.Visible by figure; The formation of the linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling of the present invention comprises that successively laser diode pumping source 1, pumping protection device 2, pumping coupler 3, fiber grating 4 all are fused into one through optical fiber splicer each other with double clad doping polarization maintaining optical fibre 5; Double clad doping polarization maintaining optical fibre 5 other ends as gain media are worn into Brewster's angle; As shown in Figure 2; Be that the output end face normal becomes Brewster's angle β with shaft axis of optic fibre; Because the stress rods 9 in the double clad doping polarization maintaining optical fibre 5 is a slow axis with the axis that the center of fibre core 10 is connected to, the axis of phase quadrature be fast axle with it, and need keeping fast vertical (Fig. 2 b) or the slow axis of normal line of butt end and polarization maintaining optical fibre simultaneously, vertical (Fig. 2 a); To obtain the linear polarization characteristic; The laser alignment of a end with Brewster's angle of double clad polarization maintaining optical fibre 5 being exported through fiber port coupled lens 6 arrives acousto-optic modulator 7, and level crossing 8 is positioned at the first-order diffraction light direction of described acousto-optic modulator 7 to form Laser feedback, and laser is by the fiber grating 4 one ends output of described double clad doping polarization maintaining optical fibre 5.
It is following to take a practical implementation example introduction below:
See also Fig. 1, the semiconductor laser that to adopt 2 centre wavelengths be 976nm, power output 5.7W connects into Fig. 1 device through (2+1) * 1 pumping coupler with optical fiber splicer, and the double clad polarization maintaining optical fibre length of employing is 3m, and Yb mixes in the fibre core
3+, inner cladding is an octagon, and its maximum gauge is 130 μ m (NA=0.22), and core diameter is 10 μ m (NA=0.08), and used fiber grating is 1080nm.Through the pulse duration and the signal repetition rate (identical) of regulating acousto-optic modulator 7 outputs with the repetition of output laser; This laser output repetition is regulated between tens to hundreds of kHz and all can be obtained the stable pulse sequence; The pulse energy that can obtain improves greatly; Pulsewidth is in tens nanoseconds, and live width is lower than 0.07nm, and degree of polarization is all greater than 14dB.
Experiment shows the present invention and compared with techniques formerly; The linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling of the present invention has the characteristics of compact conformation, all optical fibre structureization; Its high repetition is adjustable; Export the linear polarization pulse of narrow pulsewidth, narrow linewidth, high-peak power, improved lasing efficiency greatly.
Claims (4)
1. the linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling; Be characterised in that its formation comprises successively: laser diode pumping source (1), pumping protection device (2), pumping coupler (3), fiber grating (4), double clad doping polarization maintaining optical fibre (5), fiber port coupled lens (6), acousto-optic modulator (7) and level crossing (8); Described fiber grating (4) constitutes linear F-P cavity configuration with level crossing (8); Double clad doping polarization maintaining optical fibre (5) is as gain media; Through fiber port coupled lens (6) double clad is mixed the laser alignment of polarization maintaining optical fibre (5) output to acousto-optic modulator (7); Described double clad doping polarization maintaining optical fibre (5) is called rear end face with an end of fiber port coupled lens (6) coupling; This rear end face is worn into Brewster's angle, and it is vertical with the fast axle or the slow axis of described double clad doping polarization maintaining optical fibre (5) that the normal of this rear end face keeps, to obtain the linear polarization characteristic; Described level crossing (8) is positioned at the first-order diffraction light direction of described acousto-optic modulator (7) to form feedback, and laser is by the end output of the fiber grating (4) of described double clad doping polarization maintaining optical fibre.
2. the linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber according to claim 1 coupling is characterized in that the along that is centered close to described fiber port coupled lens (6) of described double clad doping polarization maintaining optical fibre (5) rear end face.
3. the linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling according to claim 1, described level crossing (8) is perpendicular with the first-order diffraction light direction of described acousto-optic modulator (7), and is thoroughly high and high anti-to laser to pump light.
4. the linear polarization sound and light Q adjusting optical fiber laser of single-end optical fiber coupling according to claim 1; It is characterized in that described fiber grating (4) is the fiber grating of double clad; Grating only limits core segment, causes the laser part reflection, and the pump light wavelength is not had influence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100042886A CN102122790B (en) | 2011-01-11 | 2011-01-11 | Linear polarization acousto-optic modulator Q-switched optical fiber laser with single end coupled with optical fiber |
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| CN2011100042886A CN102122790B (en) | 2011-01-11 | 2011-01-11 | Linear polarization acousto-optic modulator Q-switched optical fiber laser with single end coupled with optical fiber |
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| CN102122790B true CN102122790B (en) | 2012-04-18 |
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| CN103094819A (en) * | 2013-01-16 | 2013-05-08 | 中国科学院上海光学精密机械研究所 | Narrow line width acousto-optic Q-switched thulium mixed fiber laser |
| CN103199418A (en) * | 2013-04-11 | 2013-07-10 | 杭州镭克普光电技术有限公司 | Periodical domain reversal crystal electro-optic Q-switched-based pulse optical fiber laser |
| CN105244747A (en) * | 2015-09-23 | 2016-01-13 | 中国工程物理研究院应用电子学研究所 | High-energy long pulse laser obtaining device, method and application |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1527446A (en) * | 2003-09-19 | 2004-09-08 | 中国科学院上海光学精密机械研究所 | Laser diode pumped ps-level active mode-locking solid plane waveguide laser |
| CN1866645A (en) * | 2006-06-09 | 2006-11-22 | 中国科学院上海光学精密机械研究所 | Pulse width adjustable acoustic-optic Q-switched double cladded fiber laser |
| CN101102032A (en) * | 2007-07-18 | 2008-01-09 | 中国科学院上海光学精密机械研究所 | Stable high-repeating frequency sound and light Q adjusting optical fiber laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003258341A (en) * | 2002-02-21 | 2003-09-12 | Sei Tsunezo | Linear polarized fiber laser and second harmonic output resonator structure |
| US7848012B2 (en) * | 2007-07-10 | 2010-12-07 | Deep Photonics Corporation | Method and apparatus for continuous wave harmonic laser |
| US20090252454A1 (en) * | 2008-04-04 | 2009-10-08 | Francois Chenard | Fiber-optic termination with brewster angled tip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1527446A (en) * | 2003-09-19 | 2004-09-08 | 中国科学院上海光学精密机械研究所 | Laser diode pumped ps-level active mode-locking solid plane waveguide laser |
| CN1866645A (en) * | 2006-06-09 | 2006-11-22 | 中国科学院上海光学精密机械研究所 | Pulse width adjustable acoustic-optic Q-switched double cladded fiber laser |
| CN101102032A (en) * | 2007-07-18 | 2008-01-09 | 中国科学院上海光学精密机械研究所 | Stable high-repeating frequency sound and light Q adjusting optical fiber laser |
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| JP特开2003-258341A 2003.09.12 |
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Address after: 210038 Jiangsu Province, Nanjing economic and Technological Development Zone No. 12 Chong Xing Ke Lu base room 206 Patentee after: Nanjing light laser technology Co., Ltd. Address before: 210038 Jiangsu Province, Nanjing economic and Technological Development Zone No. 12 Chong Xing Ke Lu base room 206 Patentee before: Nanjing fly Photoelectric Technology Co., Ltd. |
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