CN104752949B - Output simultaneously has obtained the device of the continuous hollow laser of the dual wavelength of phase compensation - Google Patents
Output simultaneously has obtained the device of the continuous hollow laser of the dual wavelength of phase compensation Download PDFInfo
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Abstract
The device that output simultaneously has obtained the continuous hollow laser of the dual wavelength of phase compensation belongs to laser technology field.Known technology can not compensate to the phase of the hollow beam at diffraction surfaces；A kind of hollow laser of wavelength can only be produced.Present invention be characterized in that diffraction shaping total reflective mirror, Nd:The solid crystal of YAG, diffraction optical element, mirror of turning back coaxially are arranged along optical axis A successively optics, LD pumping sources are located on the outside of diffraction shaping total reflective mirror, diffraction shaping total reflective mirror is made up of the included shaping diffraction optical element of optical parallel plate, diffraction optical element is made up of the included phase compensation diffraction optical element of optical parallel plate, and mirror of turning back is located on the outside of diffraction optical element；Total reflective mirror, mirror of turning back, Nd:The hollow crystal of YAG, outgoing mirror are coaxially arranged along optical axis B successively optics；Mirror of turning back is in 45° angle with optical axis A, optical axis B simultaneously, and mirror of turning back is totally reflected by Nd:Harmonic light caused by the solid crystal of YAG, mirror total transmissivity of turning back is by Nd:Harmonic light caused by the hollow crystal of YAG；Optical axis A intersects and vertical with optical axis B.
Description
Technical field
The present invention relates to the device that a kind of while output has obtained the continuous hollow laser of the dual wavelength of phase compensation, by with
The Nd of diffraction optical element:YAG laserresonators produce the hollow laser of 946nm quasi-three-levels, recycle the hollow laser of the 946nm
There is the Nd of central through hole in intracavity pump:YAG laser crystal, the hollow laser output of 1064nm four-levels is obtained, so as to realize
946nm and 1064nm dual wavelengths continuously hollow laser while export, belong to laser technology field.
Background technology
Because hollow laser has a series of special physical properties, the cylindrical distribution of such as intensity, salt free ligands effect,
This causes hollow laser to be had a wide range of applications in the fields such as laser optics, optical information processing, biomedicine.
Needed in some fields simultaneously using the continuous hollow laser of two wavelength of 946nm and 1064nm, for example, in laser
Manufacture field, the laser using different wave length is just needed for the different processing object of material；For another example, in biomedical sector,
Because laser radiation depth of interaction requires different, the wavelength of the laser of use is also different；Also be exactly laser and frequency,
The upper laser for being also required to different wavelength simultaneously of difference frequency processing.
Continuously the acquisition of hollow laser and the development of binary optical theory and technology are closely related for dual wavelength, and core original paper is
DOE (Diffractive OpticalElements, diffraction optical element).A kind of known technology related to the present invention is by printing
Step in Acta Physica Sinica 53 (6)：1777~1781,2004, one entitled " a kind of Theoretical and Experimental Study of new hollow beam "
Disclosed in paper.The technology is the scheme that a kind of resonator utilized using diffraction optical element as speculum obtains hollow laser,
As shown in figure 1, M1And M2All it is a kind of circular reflector, center is diaphragm, and diaphragm radius is all 1mm.Two as resonator
End, M1For output plane mirror, M2For the diffraction optical element with a certain reflectivity distribution, M1And M2Bore be 1mm, the long L of chamber
For 500mm, a kind of lamp pump Nd is constituted:YAG laser.The known technology has following 2 points of deficiencies：First, due to the program
Using only a diffraction optical element, it is thus impossible to the phase of the hollow beam at diffraction surfaces is compensated, away from image planes
Hot spot can deviate from hollow laser distribution；Second, a kind of hollow laser of wavelength can only be produced.
The content of the invention
In order to obtain dual wavelength continuously hollow laser output, also, the hollow laser can obtain phase compensation simultaneously,
We have invented the device that a kind of while output has obtained the continuous hollow laser of the dual wavelength of phase compensation.
The output simultaneously of the present invention has obtained the device of the continuous hollow laser of the dual wavelength of phase compensation characterized in that, such as
Shown in Fig. 2, diffraction shaping total reflective mirror 2, Nd:The solid crystal 3 of YAG, diffraction optical element 4, mirror 6 of turning back are along optical axis A successively optics
Coaxial arrangement, LD pumping sources 1 are located at the outside of diffraction shaping total reflective mirror 2, and diffraction shaping total reflective mirror 2 is included whole by optical parallel plate
Shape diffraction optical element is formed, and diffraction optical element 4 is made up of the included phase compensation diffraction optical element of optical parallel plate, is rolled over
Tilting mirror 6 is located at the outside of diffraction optical element 4；Total reflective mirror 5, turn back mirror 6, Nd:The hollow crystal 7 of YAG, outgoing mirror 8 along optical axis B successively
Optics is coaxially arranged；Mirror 6 of turning back is in simultaneously 45° angle with optical axis A, optical axis B, and mirror 6 of turning back is totally reflected by Nd:YAG is solid, and crystal 3 produces
Raw harmonic light, the total transmissivity of mirror 6 of turning back is by Nd:Harmonic light caused by the hollow crystal 7 of YAG；Optical axis A intersects and vertical with optical axis B.
The output simultaneously of the actually present invention has obtained the device of the continuous hollow laser of the dual wavelength of phase compensation by two
Resonator is formed.First resonator is by diffraction shaping total reflective mirror 2, Nd:The solid crystal 3 of YAG, outgoing mirror 8 are formed, and wherein diffraction is whole
Total reflective mirror of the shape total reflective mirror 2 as the resonator, semi-reflective mirror of the outgoing mirror 8 as the resonator, Nd:The solid crystal 3 of YAG is should
The working-laser material of resonator.Second resonator is by total reflective mirror 5, Nd:The hollow crystal 7 of YAG, outgoing mirror 8 are formed, total reflective mirror 5
As the total reflective mirror of the resonator, semi-reflective mirror of the outgoing mirror 8 as the resonator, Nd:The hollow crystal 7 of YAG is the resonator
Working-laser material.First resonator and the second resonator intersect at mirror 6 of turning back, and it is outgoing mirror 8 to share a semi-reflective mirror, and the
The working-laser material of two resonators is Nd:The hollow crystal 7 of YAG is simultaneously in the first resonator.LD pumping sources 1 are first humorous
Shake the pumping of chamber.
The working condition that the output simultaneously of the present invention has obtained the continuous device of hollow laser of the dual wavelength of phase compensation is,
The semiconductor laser sent by LD pumping sources 1 passes through the pumping Nd of diffraction shaping total reflective mirror 2:The solid crystal 3 of YAG, caused resonance
Light vibrates between diffraction shaping total reflective mirror 2 and outgoing mirror 8, vibrates light path using optical axis A and optical axis B as axle, and in the Jing6Chu that turns back
Turn back.Meanwhile the harmonic light is shaped as hollow beam by diffraction shaping total reflective mirror 2, and mended by the phase of diffraction optical element 4
Repay.It is shaped as hollow beam and obtains the harmonic light of phase compensation by vibrating continuous positive feedback and constantly being amplified, this is humorous
The part of light of shaking exports as a kind of continuous hollow laser of wavelength from outgoing mirror 8.The remainder of the harmonic light is as
The pump light of two resonators, pumping Nd:The hollow crystal 7 of YAG, because the pump light is hollow beam, Nd:The hollow crystal 7 of YAG
With hollow-core construction, therefore, while the pump energy of the pump light is fully used, hollow harmonic light is produced.The sky
Heart harmonic light vibrates between total reflective mirror 5 and outgoing mirror 8, and vibration light path is using optical axis B as axle.The hollow harmonic light is by vibrating not
Disconnected positive feedback is simultaneously constantly amplified, and the continuous hollow laser as another wavelength exports from outgoing mirror 8.
Be all-trans film or the anti-reflection film of certain wavelength light are coated with optical parallel plate, and on optical parallel plate
Diffraction optical element is made by delineation, coating process, is all mature technology of the prior art.Existing diffraction optical element skill
Art can almost carry out any reshaping, including annular to Laser beam energy distribution；Technology can also be negated by phase, is realized
The phase compensation of laser beam through diffraction.On this basis, it is able to comprehensive reality with reference to the scheme of the present invention, the purpose of the present invention
It is existing.
The present invention also obtains multinomial subsidiary technique effect.The working-laser material of second resonator is Nd:The hollow crystal of YAG
7 are embedded into the first resonator so that the apparatus structure of the present invention is simple, compact.By harmonic light caused by the first resonator
A part is intracavity pump mode as the mode of the pump light of the second resonator, and which can fundamentally avoid existing skill
Art produces gain competition problem during dual-wavelength laser by single laser crystal；Intracavity pump mode belongs to hot boosting pumping,
This kind of mode can effectively alleviate the fuel factor of laser, and then can improve the stability of dual wavelength continuous laser output.
Brief description of the drawings
Fig. 1 is the existing cavity resonator structure schematic diagram using diffraction optical element as speculum.Fig. 2 is the simultaneously defeated of the present invention
Go out to have obtained the structural representation of the continuous device of hollow laser of the dual wavelength of phase compensation, the figure is used as Figure of abstract simultaneously.
Embodiment
The output simultaneously of the present invention has obtained the dual wavelength of phase compensation, and continuously its concrete scheme of the device of hollow laser is such as
It is lower described.As shown in Fig. 2 diffraction shaping total reflective mirror 2, Nd:The solid crystal 3 of YAG, diffraction optical element 4, mirror 6 of turning back are along optical axis A
Optics is coaxially arranged successively, and LD pumping sources 1 are located at the outside of diffraction shaping total reflective mirror 2, and LD pumping sources 1 are that output wavelength is 808nm
Semiconductor laser；Diffraction shaping total reflective mirror 2 is made up of the included shaping diffraction optical element of optical parallel plate, diffraction optics
Element 4 is made up of the included phase compensation diffraction optical element of optical parallel plate, and mirror 6 of turning back is located at the outside of diffraction optical element 4.
By Nd:The wavelength of harmonic light is 946nm caused by the solid crystal 3 of YAG.Nd:The size of the solid crystal 3 of YAG is 5 × 8mm of Φ3,
Doping concentration is 1.1at%, and two thang-kng end face plating transmissivities are more than 99.9% 808nm anti-reflection films.
Total reflective mirror 5, turn back mirror 6, Nd:The hollow crystal 7 of YAG, outgoing mirror 8 are coaxially arranged along optical axis B successively optics.By Nd:
The wavelength of harmonic light is 1064nm caused by the hollow crystal 7 of YAG.The minute surface plating reflectivity of total reflective mirror 5 towards mirror 6 of turning back is more than
99.9% 1064nm laser high-reflecting films.Nd:The overall size of the hollow crystal 7 of YAG is 5 × 10mm of Φ3, central through hole is a diameter of
Φ 3mm, doping concentration 1at%, and two thang-kng end face plating transmissivities are more than 99.9% 1064nm anti-reflection films.Outgoing mirror
8 towards Nd:The minute surface of the hollow crystal 7 of YAG plates the 1064nm that the 946nm transmission films, transmissivity that transmissivity is 5% are 3% simultaneously
Transmission film, 8 another minute surface of outgoing mirror plating transmissivity are all higher than 99.9% 946nm and 1064nm anti-reflection films.
Two thang-kng minute surfaces plating transmissivity of diffraction shaping total reflective mirror 2 is more than 99.9% 808nm pump lights and 1064nm
Laser anti-reflection film, and towards Nd:The minute surface of the solid crystal 3 of YAG plates the 946nm laser reflections of first-order bessel function form simultaneously
Film, by Nd:946nm harmonic lights caused by the solid crystal 3 of YAG are diffracted the shaping of shaping total reflective mirror 2, and in diffraction optical element 4
Place forms the hollow beam that internal diameter is 3mm, external diameter is 5mm.The phase distribution of diffraction optical element 4 is by described hollow at this
The phase of light beam is negated, and the phase negates to be realized by laser etching techniques, and two thang-kng minute surfaces of diffraction optical element 4
Plate the 946nm anti-reflection films that transmissivity is more than 99.9%.
Mirror 6 of turning back is in simultaneously 45° angle with optical axis A, optical axis B, and mirror 6 of turning back is totally reflected by Nd:Caused by the solid crystal 3 of YAG
Harmonic light, the total transmissivity of mirror 6 of turning back is by Nd:Harmonic light caused by the hollow crystal 7 of YAG.Turn back mirror 6 two thang-kng minute surfaces plating transmission
Rate is more than 99.9% 1064nm anti-reflection films, and plates 946nm of the reflectivity more than 99.9% towards the minute surface of diffraction optical element 4
High-reflecting film.
Optical axis A intersects and vertical with optical axis B.
The working condition of the concrete scheme is as described below.The 808nm semiconductor lasers sent by LD pumping sources 1, which pass through, to spread out
Penetrate the pumping Nd of shaping total reflective mirror 2:The solid crystal 3 of YAG, produce4F3/2-4I9/2Transition, the 946nm quasi-three-level harmonic lights of acquisition exist
Vibrated between diffraction shaping total reflective mirror 2 and outgoing mirror 8, vibration light path is rolled over using optical axis A and optical axis B as axle in the Jing6Chu that turns back
Turn.Meanwhile the 946nm harmonic lights are hollow beam by the diffraction shaping of diffraction shaping total reflective mirror 2, and by diffraction optical element 4
Phase compensation, make its complanation ripple.It is shaped as hollow beam and obtains the harmonic light of phase compensation by vibrating constantly just
Feed back and constantly amplified, a part for the harmonic light is defeated from outgoing mirror 8 as the continuous hollow laser that a kind of wavelength is 946nm
Go out.Pump light of the remainder of the harmonic light as the second resonator, pumping Nd:The hollow crystal 7 of YAG, produce4F3/2-4I11/2
Transition, because the pump light is hollow beam, Nd:The hollow crystal 7 of YAG also has hollow-core construction, and size matches, therefore,
While the pump energy of the pump light is fully used, the hollow harmonic lights of 1064nm are produced.The hollow harmonic lights of the 1064nm
Vibrated between total reflective mirror 5 and outgoing mirror 8, vibration light path is using optical axis B as axle.The hollow harmonic light is by vibrating continuous positive feedback
And constantly amplified, exported as the continuous hollow laser that another wavelength is 1064nm from outgoing mirror 8.Although Nd:YAG is hollow
Crystal 7 is smaller to the 946nm quasi-three-level resonance absorption coefficients of light of intracavitary, and still, larger intracavity power can also produce higher
Absorption.Also, because 946nm quasi-three-levels harmonic light and 1064nm four-levels harmonic light produce in respective gain media
It is raw, therefore, it is possible to fundamentally avoid modal gain race problem.In addition, using 946nm quasi-three-level resonance optical pumpings Nd:
The hollow crystal 7 of YAG belongs to hot boosting pump mode, and this kind of mode can reduce the stoke between pump light photon and laser photon
This frequency displacement, Stokes efficiency is improved, caused used heat during lasing is reduced, effectively can be alleviated in gain medium
Used heat, and then can realize that stable dual wavelength continuously exports.
Claims (1)
1. a kind of while output has obtained the device of the continuous hollow laser of the dual wavelength of phase compensation, it is characterised in that diffraction is whole
Shape total reflective mirror (2), Nd:The solid crystal of YAG (3), diffraction optical element (4), mirror of turning back (6) are coaxially arranged along optical axis A successively optics
Cloth, LD pumping sources (1) are located on the outside of diffraction shaping total reflective mirror (2), and diffraction shaping total reflective mirror (2) is included whole by optical parallel plate
Shape diffraction optical element is formed, and diffraction optical element (4) is made up of the included phase compensation diffraction optical element of optical parallel plate,
Mirror (6) of turning back is located on the outside of diffraction optical element (4)；Total reflective mirror (5), mirror of turning back (6), Nd:The hollow crystal of YAG (7), outgoing mirror
(8) coaxially arranged along optical axis B successively optics；Turn back mirror (6) while be in 45° angle with optical axis A, optical axis B, mirror of turning back (6) total reflection
By Nd:Harmonic light caused by the solid crystal of YAG (3), mirror of turning back (6) total transmissivity is by Nd:Resonance caused by the hollow crystal of YAG (7)
Light；Optical axis A intersects and vertical with optical axis B；
LD pumping sources (1) are the semiconductor laser that output wavelength is 808nm；
808nm pump light of two thang-kng minute surfaces plating transmissivity more than 99.9% and 1064nm of diffraction shaping total reflective mirror (2) swash
Light anti-reflection film, and towards Nd:The minute surface of the solid crystal of YAG (3) plates the 946nm laser reflections of first-order bessel function form simultaneously
Film；
Nd:The size of the solid crystal of YAG (3) is 5 × 8mm of Φ3, doping concentration 1.1at%, and two thang-kng end face platings are saturating
Penetrate the 808nm anti-reflection films that rate is more than 99.9%；
To be negated by the phase of hollow beam at this, the phase negates by swashing the phase distribution of diffraction optical element (4)
Optical etching technology is realized, and two thang-kng minute surfaces plating transmissivity of diffraction optical element (4) is anti-reflection more than 99.9% 946nm
Film；
The minute surface plating reflectivity of total reflective mirror (5) towards mirror (6) of turning back is more than 99.9% 1064nm laser high-reflecting films；
Turn back mirror (6) two thang-kng minute surfaces plating transmissivity be more than 99.9% 1064nm anti-reflection films, and towards diffraction optics member
The minute surface plating reflectivity of part (4) is more than 99.9% 946nm high-reflecting films；
Nd:The overall size of the hollow crystal of YAG (7) is 5 × 10mm of Φ3, a diameter of Φ 3mm of central through hole, doping concentration is
1at%, and two thang-kng end face plating transmissivities are more than 99.9% 1064nm anti-reflection films；
Outgoing mirror (8) is towards Nd:The minute surface of the hollow crystal of YAG (7) plates the 946nm transmission films that transmissivity is 5%, transmissivity simultaneously
For 3% 1064nm transmission films, the 946nm and 1064nm that another minute surface plating transmissivity of outgoing mirror (8) is all higher than 99.9% are anti-reflection
Film；
The 808nm semiconductor lasers sent by LD pumping sources (1) pass through diffraction shaping total reflective mirror (2) pumping Nd:The solid crystal of YAG
(3), produce4F3/2-4I9/2Transition, the 946nm quasi-three-levels harmonic light of acquisition is in diffraction shaping total reflective mirror (2) and outgoing mirror (8)
Between vibrate, vibration light path and is turned back using optical axis A and optical axis B as axle at mirror of turning back (6) place；Meanwhile accurate three energy of the 946nm
Level harmonic light is hollow beam by diffraction shaping total reflective mirror (2) diffraction shaping, and by diffraction optical element (4) phase compensation, is made
Its complanation ripple, it is shaped as hollow beam and obtains the harmonic light of phase compensation by vibrating continuous positive feedback and continuous
Amplification, a part for the harmonic light export as the continuous hollow laser that a kind of wavelength is 946nm from outgoing mirror (8)；
Pump light of the remainder of the harmonic light as the second resonator, pumping Nd:The hollow crystal of YAG (7), produce4F3/2-4I11/2Transition, produces the hollow harmonic lights of 1064nm, and the hollow harmonic lights of the 1064nm shake between total reflective mirror (5) and outgoing mirror (8)
Swing, vibration light path is using optical axis B as axle, and the hollow harmonic light is by vibrating continuous positive feedback and constantly being amplified, as another kind
The continuous hollow laser that wavelength is 1064nm exports from outgoing mirror (8).
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| CN201510096800.2A CN104752949B (en) | 2015-03-05 | 2015-03-05 | Output simultaneously has obtained the device of the continuous hollow laser of the dual wavelength of phase compensation |
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| CN110932075B (en) * | 2019-05-09 | 2021-09-17 | 长春理工大学 | Dual-wavelength pulse pair laser output method and laser |
Citations (2)
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|---|---|---|---|---|
| US5986807A (en) * | 1997-01-13 | 1999-11-16 | Xerox Corporation | Single binary optical element beam homogenizer |
| CN2704144Y (en) * | 2002-10-31 | 2005-06-08 | 迈克罗拉斯激光系统股份公司 | Laser system combining several laser beams |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3549331B2 (en) * | 1996-05-10 | 2004-08-04 | 新日本製鐵株式会社 | Binary optics |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5986807A (en) * | 1997-01-13 | 1999-11-16 | Xerox Corporation | Single binary optical element beam homogenizer |
| CN2704144Y (en) * | 2002-10-31 | 2005-06-08 | 迈克罗拉斯激光系统股份公司 | Laser system combining several laser beams |
Non-Patent Citations (3)
| Title |
|---|
| Semiconductor laser diode to single-mode fiber coupling using diffractive optical elements;Si Lu et al.;《OPTICS COMMUNICATIONS》;20030531;第220卷(第4-6期);第346页第1栏-第2栏，图1、2 * |
| 一种新空心光束的理论及实验研究;张蕾等;《物理学报》;20040612;第53卷(第6期);摘要，第1779页第1栏-1780页第2栏，图3、4 * |
| 输出镜透过率对腔内泵浦双波长激光器热透镜效应的影响研究;董渊等;《中国科技论文在线》;20141128;第2页第46-58行，图1 * |
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