CN104752949A - Device for simultaneously outputting dual-wavelength continuous hollow lasers with phase compensation - Google Patents
Device for simultaneously outputting dual-wavelength continuous hollow lasers with phase compensation Download PDFInfo
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- CN104752949A CN104752949A CN201510096800.2A CN201510096800A CN104752949A CN 104752949 A CN104752949 A CN 104752949A CN 201510096800 A CN201510096800 A CN 201510096800A CN 104752949 A CN104752949 A CN 104752949A
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Abstract
The invention discloses a device for simultaneously outputting dual-wavelength continuous hollow lasers with phase compensation and belongs to the laser technology field. In a known technology, phases of hollow laser beams on a diffraction surface cannot be compensated, only one-wavelength hollow lasers can be generated. The device is characterized in that a diffraction shaping totally reflecting mirror is composed of a shaping diffraction optical element attached in an optical parallel panel, the shaping diffraction optical element is composed of a phase compensation diffraction optical element attached in the optical parallel panel, and a replicating mirror is arranged outside the diffraction optical element; the totally reflecting mirror, the replicating mirror, Nd:YAG hollow crystals, and an output mirror are sequentially arranged along an optical axis B in an optical and coaxial way; the replicating mirror is simultaneously formed into an angle of 45 degrees respectively with the optical axis A and the optical axis B; the replicating mirror totally reflects resonant lights generated by Nd:YAG solid crystals and Nd:YAG hollow crystals; the optical axis A and the optical axis B are intersected perpendicularly.
Description
Technical field
The present invention relates to a kind of output simultaneously and obtain the device of the continuous hollow laser of dual wavelength of phase compensation, the hollow laser of 946nm quasi-three-level is produced by the Nd:YAG laserresonator with diffraction optical element, recycle the hollow laser of this 946nm has central through hole Nd:YAG laser crystal in intracavity pump, obtain the hollow Laser output of 1064nm four-level, thus export while realizing the continuous hollow laser of 946nm and 1064nm dual wavelength, belong to laser technology field.
Background technology
Because hollow laser has a series of special physical property, distribution as cylindrical in intensity, salt free ligands effect etc., this makes hollow laser have a wide range of applications in the fields such as laser optics, optical information processing, biomedicine.
Need the continuous hollow laser simultaneously using 946nm and 1064nm two wavelength in some field, such as, in field of laser processing, the laser adopting different wave length is just needed for the processing object that material is different; For another example, at biomedical sector, because laser radiation depth of interaction requires different, the wavelength of the laser of employing is also different; Also have laser with frequently, in difference frequency process while also need the laser of different wavelength.
The acquisition of the continuous hollow laser of dual wavelength and the development of binary optical theory and technology closely related, core original paper is DOE (Diffractive OpticalElements, diffraction optical element).A kind of known technology related to the present invention is by publishing at Acta Physica Sinica 53 (6): 1777 ~ 1781, and 2004, one section is entitled as disclosed in the paper of " a kind of Theoretical and Experimental Study of new hollow beam ".The resonant cavity of this technology to be a kind of utilization with diffraction optical element be speculum obtains the scheme of hollow laser, as shown in Figure 1, and M
1and M
2be all a kind of circular reflector, center is diaphragm, and diaphragm radius is all 1mm.As the two ends of resonant cavity, M
1for output plane mirror, M
2for there is the diffraction optical element of a certain reflectivity distribution, M
1and M
2bore be 1mm, the long L in chamber is 500mm, constitutes a kind of lamp pump Nd:YAG laser.Described known technology has following 2 deficiencies: one, because the program only uses a diffraction optical element, therefore, can not compensate the phase place of the hollow beam at diffraction surfaces place, and the hot spot away from image planes will depart from the distribution of hollow laser; Its two, a kind of hollow laser of wavelength can only be produced.
Summary of the invention
In order to obtain the continuous hollow Laser output of dual wavelength simultaneously, and described hollow laser can obtain phase compensation, we have invented a kind of output simultaneously and obtains the device of the continuous hollow laser of dual wavelength of phase compensation.
The device obtaining the continuous hollow laser of dual wavelength of phase compensation that simultaneously exports of the present invention is characterized in that, as shown in Figure 2, the solid crystal 3 of diffraction shaping total reflective mirror 2, Nd:YAG, diffraction optical element 4, mirror 6 of turning back coaxially are arranged along optical axis A successively optics, LD pumping source 1 is positioned at outside diffraction shaping total reflective mirror 2, diffraction shaping total reflective mirror 2 is made up of the included shaping diffraction optical element of optical parallel plate, diffraction optical element 4 is made up of the included phase compensation diffraction optical element of optical parallel plate, and mirror 6 of turning back is positioned at outside diffraction optical element 4; Total reflective mirror 5, mirror 6 of turning back, the hollow crystal 7 of Nd:YAG, outgoing mirror 8 are coaxially arranged along optical axis B successively optics; Mirror 6 of turning back is simultaneously 45° angle with optical axis A, optical axis B, the harmonic light that mirror 6 total reflection of turning back is produced by the solid crystal 3 of Nd:YAG, the harmonic light that mirror 6 total transmissivity of turning back is produced by the hollow crystal 7 of Nd:YAG; Optical axis A is crossing with optical axis B and vertical.
In fact the device obtaining the continuous hollow laser of dual wavelength of phase compensation that simultaneously exports of the present invention is made up of two resonant cavitys.First resonant cavity is made up of diffraction shaping total reflective mirror 2, the solid crystal 3 of Nd:YAG, outgoing mirror 8, wherein diffraction shaping total reflective mirror 2 is as the total reflective mirror of this resonant cavity, outgoing mirror 8 is as the semi-reflective mirror of this resonant cavity, and Nd:YAG is solid, and crystal 3 is the working-laser material of this resonant cavity.Second resonant cavity is made up of total reflective mirror 5, the hollow crystal 7 of Nd:YAG, outgoing mirror 8, and total reflective mirror 5 is as the total reflective mirror of this resonant cavity, and outgoing mirror 8 is as the semi-reflective mirror of this resonant cavity, and the hollow crystal 7 of Nd:YAG is the working-laser material of this resonant cavity.First resonant cavity and the second resonant cavity intersect at mirror 6 of turning back, and share a semi-reflective mirror and outgoing mirror 8, and the working-laser material of the second resonant cavity and the hollow crystal 7 of Nd:YAG are arranged in the first resonant cavity simultaneously.LD pumping source 1 is the pumping of the first resonant cavity.
The operating state obtaining the device of the continuous hollow laser of dual wavelength of phase compensation that simultaneously exports of the present invention is, the semiconductor laser sent by LD pumping source 1 is through the solid crystal 3 of diffraction shaping total reflective mirror 2 pumping Nd:YAG, the harmonic light produced vibrates between diffraction shaping total reflective mirror 2 and outgoing mirror 8, vibration light path, and to be turned back at the Jing6Chu that turns back for axle with optical axis A and optical axis B.Meanwhile, described harmonic light is shaped as hollow beam by diffraction shaping total reflective mirror 2, and by diffraction optical element 4 phase compensation.Be shaped as hollow beam and the harmonic light obtaining phase compensation is constantly amplified by the continuous positive feedback of vibration, the part of this harmonic light exports from outgoing mirror 8 as a kind of continuous hollow laser of wavelength.The remainder of this harmonic light is as the pump light of the second resonant cavity, and the hollow crystal 7 of pumping Nd:YAG, because this pump light is hollow beam, the hollow crystal 7 of Nd:YAG also has hollow-core construction, therefore, while the pump energy of this pump light is fully used, produce hollow harmonic light.This hollow harmonic light vibrates between total reflective mirror 5 and outgoing mirror 8, vibration light path with optical axis B for axle.This hollow harmonic light passes through the continuous positive feedback of vibration and is constantly amplified, and the continuous hollow laser as another kind of wavelength exports from outgoing mirror 8.
Optical parallel plate being coated be all-trans film or the anti-reflection film of certain wavelength light, and making diffraction optical element by delineation, coating process on optical parallel plate, is all mature technology of the prior art.Existing diffraction optical element technology almost can carry out any reshaping to Laser beam energy distribution, comprises annular; Can also phase place negate technology be passed through, realize the phase compensation of the laser beam through diffraction.On this basis, in conjunction with the scheme of the present invention, the object of the present invention is able to round Realization.
The present invention also obtains multinomial subsidiary technique effect.The working-laser material of the second resonant cavity and the hollow crystal 7 of Nd:YAG are embedded in the first resonant cavity, make the apparatus structure of the present invention simple, compact.A part for the harmonic light produced by first resonant cavity is intracavity pump mode as the mode of the pump light of the second resonant cavity, gain competition problem when which can fundamentally avoid prior art to produce dual-wavelength laser by single laser crystal; Intracavity pump mode belongs to hot boosting pumping, and this kind of mode effectively can alleviate the thermal effect of laser, and then can improve the stability of dual wavelength continuous laser output.
Accompanying drawing explanation
The cavity resonator structure schematic diagram of Fig. 1 to be existing with diffraction optical element be speculum.Fig. 2 is that the output simultaneously of the present invention obtains the structural representation of the device of the continuous hollow laser of dual wavelength of phase compensation, and this figure is simultaneously as Figure of abstract.
Embodiment
It is as described below that simultaneously the exporting of the present invention obtains its concrete scheme of device of the continuous hollow laser of dual wavelength of phase compensation.As shown in Figure 2, the solid crystal 3 of diffraction shaping total reflective mirror 2, Nd:YAG, diffraction optical element 4, mirror 6 of turning back coaxially are arranged along optical axis A successively optics, LD pumping source 1 is positioned at outside diffraction shaping total reflective mirror 2, LD pumping source 1 for output wavelength be the semiconductor laser of 808nm; Diffraction shaping total reflective mirror 2 is made up of the included shaping diffraction optical element of optical parallel plate, and diffraction optical element 4 is made up of the included phase compensation diffraction optical element of optical parallel plate, and mirror 6 of turning back is positioned at outside diffraction optical element 4.The wavelength of the harmonic light produced by the solid crystal 3 of Nd:YAG is 946nm.Nd:YAG is solid, and crystal 3 is of a size of Φ 5 × 8mm
3, doping content is 1.1at%, and the 808nm anti-reflection film that two logical light end face plating transmissivities are greater than 99.9%.
Total reflective mirror 5, mirror 6 of turning back, the hollow crystal 7 of Nd:YAG, outgoing mirror 8 are coaxially arranged along optical axis B successively optics.The wavelength of the harmonic light produced by the hollow crystal 7 of Nd:YAG is 1064nm.Total reflective mirror 5 is towards the minute surface plating reflectivity 1064nm laser high-reflecting film that is greater than 99.9% of mirror 6 of turning back.The overall size of the hollow crystal 7 of Nd:YAG is Φ 5 × 10mm
3, central through hole diameter is Φ 3mm, and doping content is 1at%, and the 1064nm anti-reflection film that two logical light end face plating transmissivities are greater than 99.9%.Outgoing mirror 8 towards the minute surface of the hollow crystal 7 of Nd:YAG plate simultaneously transmissivity be 5% 946nm transmission film, transmissivity be 3% 1064nm transmission film, another minute surface of outgoing mirror 8 plating transmissivity is all greater than 946nm and the 1064nm anti-reflection film of 99.9%.
808nm pump light and 1064nm laser anti-reflection film that two of diffraction shaping total reflective mirror 2 logical light microscopic faces plating transmissivity is greater than 99.9%, and plate the 946nm laser reflective film of first-order bessel function form towards the minute surface of the solid crystal 3 of Nd:YAG simultaneously, 946nm harmonic light diffracted shaping total reflective mirror 2 shaping produced by the solid crystal of Nd:YAG 3, and form at diffraction optical element 4 place that internal diameter is 3mm, external diameter is the hollow beam of 5mm.The PHASE DISTRIBUTION of diffraction optical element 4 is the phase place negate through the described hollow beam in this place, and described phase place negate is realized by laser etching techniques, and the 946nm anti-reflection film that two of diffraction optical element 4 logical light microscopic face plating transmissivities are greater than 99.9%.
Mirror 6 of turning back is simultaneously 45° angle with optical axis A, optical axis B, the harmonic light that mirror 6 total reflection of turning back is produced by the solid crystal 3 of Nd:YAG, the harmonic light that mirror 6 total transmissivity of turning back is produced by the hollow crystal 7 of Nd:YAG.The 1064nm anti-reflection film that two of mirror 6 of turning back logical light microscopic faces plating transmissivity is greater than 99.9%, and towards the 946nm high-reflecting film that the minute surface plating reflectivity of diffraction optical element 4 is greater than 99.9%.
Optical axis A is crossing with optical axis B and vertical.
The operating state of described concrete scheme is as described below.The 808nm semiconductor laser sent by LD pumping source 1, through the solid crystal 3 of diffraction shaping total reflective mirror 2 pumping Nd:YAG, produces
4f
3/2-
4i
9/2transition, the 946nm quasi-three-level harmonic light of acquisition vibrates between diffraction shaping total reflective mirror 2 and outgoing mirror 8, and vibration light path, and to be turned back at the Jing6Chu that turns back for axle with optical axis A and optical axis B.Meanwhile, described 946nm harmonic light is hollow beam by diffraction shaping total reflective mirror 2 diffraction shaping, and by diffraction optical element 4 phase compensation, makes its complanation ripple.Be shaped as hollow beam and the harmonic light obtaining phase compensation is constantly amplified by the continuous positive feedback of vibration, a part for this harmonic light exports from outgoing mirror 8 as the continuous hollow laser that a kind of wavelength is 946nm.The remainder of this harmonic light is as the pump light of the second resonant cavity, and the hollow crystal 7 of pumping Nd:YAG, produces
4f
3/2-
4i
11/2transition, because this pump light is hollow beam, the hollow crystal 7 of Nd:YAG also has hollow-core construction, and size coupling, therefore, while the pump energy of this pump light is fully used, produce the hollow harmonic light of 1064nm.The hollow harmonic light of this 1064nm vibrates between total reflective mirror 5 and outgoing mirror 8, vibration light path with optical axis B for axle.This hollow harmonic light passes through the continuous positive feedback of vibration and is constantly amplified, and the continuous hollow laser being 1064nm as another kind of wavelength exports from outgoing mirror 8.Although the 946nm quasi-three-level harmonic light absorption coefficient in the hollow crystal of Nd:YAG 7 pairs of chambeies is less, larger intracavity power also can produce higher absorption.Further, because 946nm quasi-three-level harmonic light and 1064nm four-level harmonic light produce, therefore, it is possible to fundamentally avoid modal gain race problem in respective gain media.In addition, the hollow crystal of 946nm quasi-three-level harmonic light pumping Nd:YAG 7 is adopted to belong to hot boosting pump mode, this kind of mode can reduce the Stokes shift between pump light photon and laser photon, improve Stokes efficiency, the used heat reduction being emitted through and producing in journey will be swashed, effectively can alleviate the used heat in gain medium, and then stable dual wavelength can be realized export continuously.
Claims (2)
1. one kind exports the device obtaining the continuous hollow laser of dual wavelength of phase compensation simultaneously, it is characterized in that, diffraction shaping total reflective mirror (2), the solid crystal of Nd:YAG (3), diffraction optical element (4), mirror (6) of turning back coaxially is arranged along optical axis A successively optics, LD pumping source (1) is positioned at diffraction shaping total reflective mirror (2) outside, diffraction shaping total reflective mirror (2) is made up of the included shaping diffraction optical element of optical parallel plate, 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 positioned at diffraction optical element (4) outside, total reflective mirror (5), mirror of turning back (6), the hollow crystal of Nd:YAG (7), outgoing mirror (8) are coaxially arranged along optical axis B successively optics, mirror (6) of turning back is simultaneously 45° angle with optical axis A, optical axis B, the harmonic light that mirror (6) total reflection of turning back is produced by the solid crystal of Nd:YAG (3), the harmonic light that mirror of turning back (6) total transmissivity is produced by the hollow crystal of Nd:YAG (7), optical axis A is crossing with optical axis B and vertical.
2. output simultaneously according to claim 1 obtains the device of the continuous hollow laser of dual wavelength of phase compensation, it is characterized in that,
LD pumping source (1) for output wavelength be the semiconductor laser of 808nm;
808nm pump light and 1064nm laser anti-reflection film that two of diffraction shaping total reflective mirror (2) logical light microscopic faces plating transmissivity is greater than 99.9%, and the 946nm laser reflective film simultaneously plating first-order bessel function form towards the minute surface of the solid crystal of Nd:YAG (3);
The solid crystal of Nd:YAG (3) is of a size of Φ 5 × 8mm
3, doping content is 1.1at%, and the 808nm anti-reflection film that two logical light end face plating transmissivities are greater than 99.9%;
The PHASE DISTRIBUTION of diffraction optical element (4) is the phase place negate through this place's hollow beam, described phase place negate is realized by laser etching techniques, and the 946nm anti-reflection film that two of diffraction optical element (4) logical light microscopic face plating transmissivities are greater than 99.9%;
Total reflective mirror (5) is towards the minute surface plating reflectivity 1064nm laser high-reflecting film that is greater than 99.9% of mirror of turning back (6);
The 1064nm anti-reflection film that two of mirror (6) of turning back logical light microscopic faces plating transmissivity is greater than 99.9%, and towards the 946nm high-reflecting film that the minute surface plating reflectivity of diffraction optical element (4) is greater than 99.9%;
The overall size of the hollow crystal of Nd:YAG (7) is Φ 5 × 10mm
3, central through hole diameter is Φ 3mm, and doping content is 1at%, and the 1064nm anti-reflection film that two logical light end face plating transmissivities are greater than 99.9%;
Outgoing mirror (8) towards the minute surface of the hollow crystal of Nd:YAG (7) plate simultaneously transmissivity be 5% 946nm transmission film, transmissivity be 3% 1064nm transmission film, outgoing mirror (8) another minute surface plating transmissivity is all greater than 946nm and the 1064nm anti-reflection film of 99.9%.
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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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|---|---|---|---|
| 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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| CN104752949B CN104752949B (en) | 2018-01-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932075B (en) * | 2019-05-09 | 2021-09-17 | 长春理工大学 | Dual-wavelength pulse pair laser output method and laser |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09304612A (en) * | 1996-05-10 | 1997-11-28 | Nippon Steel Corp | Binary optics |
| 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 |
-
2015
- 2015-03-05 CN CN201510096800.2A patent/CN104752949B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09304612A (en) * | 1996-05-10 | 1997-11-28 | Nippon Steel Corp | Binary optics |
| 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 |
|---|
| SI LU ET AL.: "Semiconductor laser diode to single-mode fiber coupling using diffractive optical elements", 《OPTICS COMMUNICATIONS》 * |
| 张蕾等: "一种新空心光束的理论及实验研究", 《物理学报》 * |
| 董渊等: "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", 《中国科技论文在线》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932075B (en) * | 2019-05-09 | 2021-09-17 | 长春理工大学 | Dual-wavelength pulse pair laser output method and laser |
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