CN103794978A - High-power narrow-linewidth tunable laser device using quadric surface mirror - Google Patents
High-power narrow-linewidth tunable laser device using quadric surface mirror Download PDFInfo
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- CN103794978A CN103794978A CN201410017838.1A CN201410017838A CN103794978A CN 103794978 A CN103794978 A CN 103794978A CN 201410017838 A CN201410017838 A CN 201410017838A CN 103794978 A CN103794978 A CN 103794978A
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Abstract
The invention discloses a high-power narrow-linewidth tunable laser device using a quadric surface mirror, and relates to the technical field of lasers. The high-power narrow-linewidth tunable laser device using the quadric surface mirror comprises an RBG, a grating turntable, a collimator, a gain medium, an output coupling mirror, a dichroscope, a pumping source, a plane completely reflecting mirror and the quadric surface mirror. The RBG is fixed on a rotating shaft of the grating turntable, the normal of the RBG is perpendicular to the rotating shaft of the grating turntable, the rotating shaft of the grating turntable coincides with the focus axis of the quadric surface mirror, the normal of the plane completely reflecting mirror is perpendicular to the rotating shaft of the grating turntable and is parallel to the axis of the quadric surface mirror, the dichroscope forms a 45-degree angle with the horizontal direction, pump light emitted by the pumping source passes through the dichroscope, the output coupling mirror and the gain medium in sequence and enters the collimator, collimation light output by the collimator is co-plane with the rotating shaft of an optical grating of the RBG, and the direction of the collimation light is perpendicular to the rotating shaft of the optical grating. The RBG is adopted as a frequency-selecting element, and a completely reflecting mirror combined device is matched to achieve the purposes of high power, narrow linewidth and tunability.
Description
Technical field
The present invention relates to laser technology field, specifically a kind of high power narrow line width regulatable laser that uses quadratic surface mirror.
Background technology
High power narrow line width regulatable laser is mainly used in phase dry doubling bundle, relevant detection, coherent optical communication, harmonic wave generation, gravitational wave detection etc., has been widely used at present the fields such as heterodyne sensing, spectrographic detection, atmospheric monitoring, optical communication.These application not only need higher laser power, and require laser to have narrow spectral bandwidth, higher wavelength stability.
High power tunable laser, the cavity body structure extensively adopting is at present made up of plane diffraction grating and high reflective mirror.Plane diffraction grating is as frequency-selecting element, and Chang Zuowei holds anti-mirror, realizes the tuning of laser frequency by the angle (incidence angle) that changes grating normal and resonator axis.Realize the narrow linewidth output of high power tunable laser, the scheme of taking at present mainly contains two kinds: 1, the incidence angle of grating is glancing incidence; 2, by strengthening the size of plane grating, if in resonant cavity beam expanding lens, thereby improve the resolution of grating.Further the method for compression bandwidth can be that two or more plane gratings are combined, and utilizes the overlapping narrow linewidth that realizes of their reflectance spectrums to export.But this method can make undoubtedly, and system configuration is complicated, the loss of resonator larger (diffraction efficiency of single plane balzed grating, often can only reach ~ 60%), further will cause power output to decline.In addition, the narrow line width regulatable laser volume of many plane gratings structure is large, encapsulation difficulty, and stability is not high.
Build high power narrow line width regulatable laser, Volume Bragg grating substitutes the traditional plane grating problems such as bulky, the complex structure of resolution system, grating insertion loss be larger well, Laser output (the Laser Phys Lett. 2010 (6): 450-453 that can provide bandwidth to be less than 0.5nm simultaneously, Opt. Express 2008 (16): 9507-9512, Opt. Lett. 2008 (22): 1204-1206).As a kind of novel frequency-selecting element, reflective Volume Bragg grating (RBG) definitely diffraction efficiency exceedes 99%; Grating loss is less than 2.5%; Spectrum is selected the minimum 20pm that reaches, the minimum 100 μ rad that reach of angle Selection; Temperature stability reaches 400 ℃, tens thousand of watts up to every square centimeter of the tolerances of continuous laser being irradiated near infrared region.Therefore, reflective Volume Bragg grating is a kind of frequency-selecting device of ideal high power narrow line width regulatable laser, and recent years, the application in laser system attracted more and more laser work personnel's concern.(select and spectrum narrowing element as wavelength, Volume Bragg grating has been applied to semiconductor laser at present, the narrow linewidth output facet of optical parametric oscillator and solid state laser)
Therefore,, based on Volume Bragg grating, the high power narrow line width regulatable laser that designs a kind of compact conformation, superior performance has very strong realistic meaning.But using RBG to carry out finding in the process of wavelength tuning, the direction of output beam can be rotated and deflect along with grating, this has brought new trouble to actual use.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of this invention is to provide a kind of high power narrow line width regulatable laser that uses quadratic surface mirror, wavelength tuning that not only can wide region, and Output of laser is stable, spectral bandwidth can be less than 0.5nm all the time, whole tuning process only needs rotating shutter turntable to complete.
The present invention realizes with following technical scheme: a kind of high power narrow line width regulatable laser that uses quadratic surface mirror, comprises reflective Volume Bragg grating, grating rotary table, collimater, gain media, output coupling mirror, dichroscope, pumping source, plane total reflective mirror and quadratic surface mirror; Described reflective Volume Bragg grating is fixed on the rotating shaft of grating rotary table; The normal of reflective Volume Bragg grating is vertical with the rotating shaft of grating rotary table; The rotating shaft of grating rotary table overlaps with the focal axis of quadratic surface mirror; The normal of plane total reflective mirror is vertical with the rotating shaft of grating rotary table, parallel with the axis of quadratic surface mirror; Dichroscope and horizontal direction are 45° angle; The pump light of pumping source transmitting enters collimater by dichroscope, output coupling mirror, gain media successively, and the collimated light of collimater output and the grating rotating shaft of reflective Volume Bragg grating are coplanar, and collimation direction of light is vertical with grating rotating shaft; The spectrum of reflective Volume Bragg grating selects the minimum 20pm of reaching, angle Selection minimumly to reach 100 μ rad, definitely diffraction efficiency exceedes 99%, grating loss is less than 2.5%, simultaneous temperature stability reaches 400 ℃, near infrared region to the tolerance of continuous laser up to every square centimeter tens thousand of watts; Described reflective Volume Bragg grating, grating rotary table and quadratic surface mirror forms the frequency selecting by grating structure of laser, is placed on inside or the outside of laser.
The invention has the beneficial effects as follows:
1, can guarantee that, in the process of the tuning running of high power, spectral bandwidth is less than 0.5nm all the time;
2,, in whole power regulating range, there is higher efficiency, stable output wavelength, favorable repeatability;
3, volume is little, simple and compact for structure, antijamming capability is strong, tuning precision is high, and whole tuning process only needs grating rotary table to rotate, simple and convenient.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is another kind of structural representation of the present invention.
Embodiment
A kind of high power narrow line width regulatable laser that uses quadratic surface mirror comprises reflective Volume Bragg grating 1, grating rotary table 2, collimater 3, gain media 4, output coupling mirror 5, dichroscope 6, pumping source 7, quadratic surface mirror 8 and plane total reflective mirror 9; Described reflective Volume Bragg grating 1 is fixed on the rotating shaft of grating rotary table 2; The normal of reflective Volume Bragg grating 1 is vertical with the rotating shaft of grating rotary table 2; The rotating shaft of grating rotary table 2 overlaps with the focal axis of quadratic surface mirror 8; Described quadratic surface mirror 8 is face of cylinder curved surface total reflective mirror, as Fig. 1; Or parabolic cylinder curved surface total reflective mirror, as Fig. 2.The normal of plane total reflective mirror 9 is vertical with the rotating shaft of grating rotary table 2, with the curved surface transverse cross-section parallel of two curved surface of column curved mirrors or parallel with the parabolical symmetry axis of parabolic cylinder curved surface cross section; Dichroscope 6 is 45° angle with horizontal direction; The pump light that pumping source 7 is launched enters collimater 3 by dichroscope 6, output coupling mirror 5, gain media 4 successively, and the grating rotating shaft of the collimated light that collimater 3 is exported and reflective Volume Bragg grating is coplanar, and collimation direction of light is vertical with grating rotating shaft.In the structure of Fig. 1 and Fig. 2, laser is reflected vertical irradiation at plane total reflective mirror, returns through reflecting former road.
Described grating rotary table 2 can be driven by stepping motor, or is driven by MEMS (micro electro mechanical system);
Described collimater 3 is spherical mirror or aspherical mirror or lens combination.
Described gain media 4 is solid state gain medium or gas gain medium or liquid gain media or semiconductor laser.
Described output coupling mirror 5 is level crossing or plano-concave mirror or cylindrical mirror.
The pump mode of described pumping source 7 is end pumping or profile pump.
Wherein, reflective Volume Bragg grating 1 plays filtering frequency-selecting in resonant cavity, receives the parallel incident light that collimater 3 is exported in resonant cavity, reflection output narrow linewidth frequency-selecting laser.It is by endovenous laser collimation that collimater 3 acts in resonant cavity, reduces as far as possible the angle of divergence of endovenous laser at reflective Volume Bragg grating 1 place, improves the frequency-selecting precision of reflective Volume Bragg grating 1.Circle quadratic surface mirror and the combination of plane total reflective mirror or parabolic quadratic surface mirror and the combination of plane total reflective mirror, effect in this resonant cavity is to solve the problem that the direction of output beam deflects along with grating rotation, in the direction of rotating at grating, be in the degree of freedom of frequency tuning, the frequency-selecting light obtaining from reflective Volume Bragg grating 1 to be returned according to the route Shi Qiyuan road of incident light, make resonant cavity form vibration.Due to the selecting frequency characteristic of reflective Volume Bragg grating 1 excellence and the present invention is directed to the designed cavity resonator structure of reflective Volume Bragg grating, the present invention can realize high power, narrow linewidth, broad tuning laser operation.
The reason that the present invention can realize high power, narrow linewidth, broad tuning laser operation mainly contains 3 points: 1, reflective Volume Bragg grating (RBG) definitely diffraction efficiency exceedes 99%, grating loss is less than 2.5%, simultaneous temperature stability reaches 400 ℃, near infrared region to the tolerance of continuous laser up to every square centimeter tens thousand of watts, be therefore suitable for high power laser light high-efficiency operation; 2, by the design of RBG, the spectrum of grating is selected the minimum 20pm of reaching, the minimum 100 μ rad that reach of angle Selection, and therefore this laser can be realized narrow linewidth output; 3, the present invention has designed the structure of carrying out frequency-selecting for RBG, preferably resolves output beam direction and rotates the phenomenon deflecting with grating, and process that whole optical maser wavelength is tunable only needs rotating shutter turntable to complete, simple to operate flexible.
Workflow: gain media is excited by pump light, absorptive pumping energy forms population inversion and distributes, and produces stimulated radiation, is amplified and is formed stable laser by internal oscillation.The process that wherein forms narrow linewidth can be described as: resonant cavity form laser generation, in the chamber in generation laser mirror collimater 3 collimate, suppose with
reflective Volume Bragg grating 1 surface is incided at angle (angle of incident light and reflective Volume Bragg grating normal), due to the selectivity characteristic of the wavelength of reflective Volume Bragg grating 1, meet, the narrowed back reflection of laser of reflective Volume Bragg grating 1 frequency-selecting condition combines to quadratic surface mirror.According to geometric feature, laser through circle quadratic surface mirror and plane total reflective mirror or parabolic quadratic surface mirror and the reflection of plane total reflective mirror will return according to the former road of the route of incident light, in resonant cavity, form vibration, final the arriving of frequency-selecting light matching with reflective Volume Bragg grating incidence angle amplified, and the laser that other stimulated radiations produce is suppressed.Because the frequency-selecting bandwidth of reflective Volume Bragg grating is very little, therefore coordinate cavity resonator structure involved in the present invention can realize high power narrow line width regulatable laser operation.
In the present embodiment, normal, grating rotary table 2 and the quadratic surface mirror 8 of reflective Volume Bragg grating 1 forms the frequency selecting by grating structure of laser, be placed on the inside of laser, by the mode of inner chamber frequency-selecting, realization is tuning to optical maser wavelength, and formation can realize the inner chamber grating tunable laser of high power, narrow linewidth, broad tuning.
Frequency selecting by grating structure also can be placed on the outside of laser, and by the mode of exocoel frequency-selecting, realization is tuning to optical maser wavelength, and formation can realize the exocoel grating tunable laser of high power, narrow linewidth, broad tuning.
Claims (6)
1. a high power narrow line width regulatable laser that uses quadratic surface mirror, is characterized in that: comprise reflective Volume Bragg grating (1), grating rotary table (2), collimater (3), gain media (4), output coupling mirror (5), dichroscope (6), pumping source (7), quadratic surface mirror (8) and plane total reflective mirror (9); Described reflective Volume Bragg grating (1) is fixed on the rotating shaft of grating rotary table (2); The normal of reflective Volume Bragg grating (1) is vertical with the rotating shaft of grating rotary table (2); The rotating shaft of grating rotary table (2) overlaps with the focal axis of quadratic surface mirror (8); The normal of plane total reflective mirror (9) is vertical with the rotating shaft of grating rotary table (2), parallel with the axis of quadratic surface mirror; Dichroscope (6) is 45° angle with horizontal direction; The pump light of pumping source (7) transmitting enters collimater (3) by dichroscope (6), output coupling mirror (5), gain media (4) successively, the collimated light of collimater (3) output and the grating rotating shaft of RBG are coplanar, and collimation direction of light is vertical with grating rotating shaft; The spectrum of described reflective Volume Bragg grating selects the minimum 20pm of reaching, angle Selection minimumly to reach 100 μ rad, definitely diffraction efficiency exceedes 99%, grating loss is less than 2.5%, simultaneous temperature stability reaches 400 ℃, near infrared region to the tolerance of continuous laser up to every square centimeter tens thousand of watts; Described reflective Volume Bragg grating (1), grating rotary table (2) and quadratic surface mirror (8) forms the frequency selecting by grating structure of laser, is placed on inside or the outside of laser.
2. a kind of high power narrow line width regulatable laser that uses quadratic surface mirror according to claim 1, is characterized in that: described collimater (3) is spherical mirror or aspherical mirror or lens combination.
3. a kind of high power narrow line width regulatable laser that uses quadratic surface mirror according to claim 1, is characterized in that: described gain media (4) is solid state gain medium or gas gain medium or liquid gain media or semiconductor laser.
4. a kind of high power narrow line width regulatable laser that uses quadratic surface mirror according to claim 1, is characterized in that: described output coupling mirror (5) is level crossing or plano-concave mirror or cylindrical mirror.
5. a kind of high power narrow line width regulatable laser that uses quadratic surface mirror according to claim 1, is characterized in that: the pump mode of described pumping source (7) is end pumping or profile pump.
6. a kind of high power narrow line width regulatable laser that uses quadratic surface mirror according to claim 1, is characterized in that: described quadratic surface mirror (8) is face of cylinder curved surface total reflective mirror or parabolic cylinder curved surface total reflective mirror.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897376A (en) * | 2015-06-19 | 2015-09-09 | 湖北航天技术研究院总体设计所 | Laser line width measuring method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2310403Y (en) * | 1997-07-09 | 1999-03-10 | 浙江大学 | High-resolution raster cavity selective sublaser |
| US20090238217A1 (en) * | 2008-03-21 | 2009-09-24 | Ondax, Inc. | Method and apparatus for wavelength tuning laser diodes |
| US20100128745A1 (en) * | 2008-11-26 | 2010-05-27 | Thomas James Dunn | Current Driven Frequency-Stepped Radiation Source and Methods Thereof |
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- 2014-01-15 CN CN201410017838.1A patent/CN103794978B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2310403Y (en) * | 1997-07-09 | 1999-03-10 | 浙江大学 | High-resolution raster cavity selective sublaser |
| US20090238217A1 (en) * | 2008-03-21 | 2009-09-24 | Ondax, Inc. | Method and apparatus for wavelength tuning laser diodes |
| US20100128745A1 (en) * | 2008-11-26 | 2010-05-27 | Thomas James Dunn | Current Driven Frequency-Stepped Radiation Source and Methods Thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897376A (en) * | 2015-06-19 | 2015-09-09 | 湖北航天技术研究院总体设计所 | Laser line width measuring method and system |
| CN104897376B (en) * | 2015-06-19 | 2018-01-05 | 湖北航天技术研究院总体设计所 | A kind of laser linewidth measuring method and system |
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