CN103311793B - Based on frequency doubling non-linear's device of bbo crystal - Google Patents
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- CN103311793B CN103311793B CN201310231278.5A CN201310231278A CN103311793B CN 103311793 B CN103311793 B CN 103311793B CN 201310231278 A CN201310231278 A CN 201310231278A CN 103311793 B CN103311793 B CN 103311793B
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Abstract
The invention discloses a kind of frequency doubling non-linear's device based on bbo crystal, for the generation of resonance intracavity frequency doubling, this nonlinear crystal frequency multiplier comprises the first bbo crystal, polarization direction whirligig and the second bbo crystal, wherein: by the second bbo crystal along optical direction half-twist, then with the first bbo crystal symmetry is positioned over the both sides of this polarization direction whirligig.Utilize the present invention, the parameter of the first bbo crystal and the second bbo crystal is just the same, so fundamental frequency light experiences multiple all after dates in resonant cavity, the frequency-doubling conversion efficiency of fundamental frequency light will obtain good compensation, the elongation degree in frequency multiplication hot spot section AB along the line direction will tend to consistent with the elongation degree along line segment AD direction, frequency multiplication hot spot will present good circle, and namely this frequency multiplier can realize higher frequency-doubling conversion efficiency and good frequency doubled light beam quality.
Description
Technical field
The present invention relates to a kind of non-linear laser frequency multiplier, particularly relate to a kind of frequency doubling non-linear's device based on bbo crystal.
Background technology
Laser freuqency doubling technology is most important in nonlinear optics, most widely used technology, and it makes optical maser wavelength constantly to ultraviolet even deep ultraviolet spectral regions expansion, constantly widens the application of laser.How obtaining efficient frequency-doubling conversion efficiency, is the hot issue of research both at home and abroad.β phase barium metaborate crystal (β-BaB
2o
4bBO) be novel frequency-doubling crystal by Chinese Academy of Sciences's structure of matter research institute Late Cambrian and development, have that effective nonlinear coefficient is large, optical homogeneity good, the advantage such as high damage threshold and temperature reception angular width, especially, bbo crystal has the characteristic that can pass through wavelength band wide (190-3500nm), becomes the excellent selection of current ultraviolet band laser frequency-doubling crystal.
But, in many frequency multiplication operations, but find that the double-frequency laser hot spot of outgoing after bbo crystal all becomes the ellipse that major and minor axis difference is larger, and frequency-doubling conversion efficiency is significantly lower than calculated value.The people such as the Hu Miao of Communication Engineering School of Electronic University Of Science & Technology Of Hangzhou propose reason at paper " when strong convergence is incident, the relation of bbo crystal shg efficiency and waist radius " in (Acta Physica Sinica, the 58th volume the 3rd phase, in March, 2009).Bbo crystal is uniaxial negative crystal, and when for I type-Ⅱphase matching frequency multiplication, the frequency multiplication in e light vibration face and o light vibration face accepts angle and differs greatly.If definition frequency multiplication accepts laser-beam divergence angle full-shape width when angle is shg efficiency drop by half when angular phase mismatch causes, so can calculate the frequency multiplication of bbo crystal on e light vibration face and o light vibration face and accept angle.
For example, for the bbo crystal that 8mm is long, when obtaining 266nm laser for 532nm laser freuqency doubling, it is 0.346mrad that the frequency multiplication in e light vibration face accepts angle, and it is then 50.33mrad that the frequency multiplication simultaneously in o light vibration face accepts angle.So large difference, by causing, the frequency-doubling conversion efficiency difference of incident 532nm light beam in crystal in e light vibration face and o light vibration face is huge, to such an extent as to the intensity of 266nm hot spot in this mutually perpendicular both direction that frequency multiplication obtains has very big difference, finally causes the ellipse that 266nm laser facula becomes major and minor axis to differ greatly.This had both been unfavorable for the raising of frequency-doubling conversion efficiency, was also unfavorable for the raising of frequency doubled light beam quality.
Summary of the invention
(1) technical problem that will solve
In order to the beam quality of the frequency-doubling conversion efficiency and double-frequency laser that improve bbo crystal, the invention provides a kind of frequency doubling non-linear's device based on bbo crystal.
(2) technical scheme
In order to achieve the above object, the invention provides a kind of frequency doubling non-linear's device based on bbo crystal, for the generation of resonance intracavity frequency doubling, this nonlinear crystal frequency multiplier comprises the first bbo crystal 1, polarization direction whirligig 2 and the second bbo crystal 3, wherein: by the second bbo crystal 3 along optical direction half-twist, then with the first bbo crystal 1 symmetry is positioned over the both sides of this polarization direction whirligig 2;
Wherein, described first bbo crystal 1 and described second bbo crystal 3 are two pieces of identical bbo crystals for frequency multiplication effect of parameter; Described polarization direction whirligig 2 is for by basic frequency laser polarization direction 90-degree rotation.
In such scheme, described polarization direction whirligig 2 is half-wave plate, natural optical rotation plate, magneto optical modulator or electrooptic modulator.
(3) beneficial effect
This frequency doubling non-linear's device based on bbo crystal provided by the invention, the parameter of the first bbo crystal 1 and the second bbo crystal 3 is just the same, so fundamental frequency light experiences multiple all after dates in resonant cavity, the frequency-doubling conversion efficiency of fundamental frequency light will obtain good compensation, the elongation degree in frequency multiplication hot spot section AB along the line direction will tend to consistent with the elongation degree along line segment AD direction, frequency multiplication hot spot will present good circle, and namely this frequency multiplier can realize higher frequency-doubling conversion efficiency and good frequency doubled light beam quality.
Accompanying drawing explanation
Fig. 1 is according to the structural representation of the embodiment of the present invention based on frequency doubling non-linear's device of bbo crystal.
Main element symbol description:
1-first bbo crystal; 2-polarization direction whirligig;
3-second bbo crystal; 4-optical direction.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, the invention provides a kind of nonlinear crystal frequency multiplier, for the generation of resonance intracavity frequency doubling, it comprises the first bbo crystal 1, polarization direction whirligig 2 and the second bbo crystal 3, wherein, this the first bbo crystal 1 and this second bbo crystal 3 are two pieces of identical bbo crystals for frequency multiplication effect of parameter, this polarization direction whirligig 2 can by basic frequency laser polarization direction 90-degree rotation, and this device can be half-wave plate, natural optical rotation plate, magneto optical modulator or electrooptic modulator.By the second bbo crystal 3 along optical direction half-twist, then with the first bbo crystal 1 symmetry is positioned over the both sides of this polarization direction whirligig 2, and the first bbo crystal 1 and the second bbo crystal 3 are as much as possible near this polarization direction whirligig 2, and in two logical light sides of the first bbo crystal 1 and two logical light sides of the second bbo crystal 3, and two of polarization direction whirligig 2 logical light sides are coated with the anti-reflection optical thin film of respective wavelength.Schematic diagram as shown in Figure 1.For the first bbo crystal 1, at crystals, as indicated by arrow c, e light vibration face is parallel to face ABFE to optical axis direction, and o light vibration face is parallel to face ADHE; For the second bbo crystal 3, at crystals, optical axis direction is as shown in arrow c ', e light vibration face is parallel to face A ' B ' F ' E ', namely be parallel to face ADHE, overlap with the o light vibration face of the first bbo crystal 1, o light vibration face is parallel to face D ' A ' E ' H ', namely be parallel to face ABFE, overlap with the e light vibration face of the first bbo crystal 1.
So, this nonlinear crystal frequency multiplier is positioned over intra resonant cavity, when the polarization fundamental frequency light meeting phase-matching condition is by the first bbo crystal, frequency multiplication on the e light vibration face being parallel to face ABFE accepts angle and accepts angle much smaller than the frequency multiplication on the o light vibration face being parallel to face ADHE, therefore the frequency-doubling conversion efficiency on the e light vibration face being parallel to face ABFE is much smaller than the frequency-doubling conversion efficiency on the o light vibration face being parallel to face ADHE, now frequency multiplication hot spot is in the ellipse elongated along line segment AD direction; Subsequently, through the fundamental frequency light polarization direction half-twist of polarization direction whirligig 2, for the second bbo crystal 3, still phase-matching condition is met; When fundamental frequency light enters the second bbo crystal 3, frequency multiplication on the e light vibration face being parallel to face ADHE accepts angle and accepts angle much smaller than the frequency multiplication on the o light vibration face being parallel to face ABFE, therefore the frequency-doubling conversion efficiency on the e light vibration face being parallel to face ADHE is much smaller than the frequency-doubling conversion efficiency on the o light vibration face being parallel to face ABFE, now frequency multiplication hot spot is in the ellipse elongated along line segment AB direction, and the lower shg efficiency on the e light vibration face caused by the first bbo crystal 1 obtains the compensation of shg efficiency higher on the o light vibration face of the second bbo crystal 3.Again because frequency multiplier is for this reason in resonant cavity, so fundamental frequency light can in opposite direction again by this frequency multiplier, namely first by the second bbo crystal 3, then by the first bbo crystal 1, frequency multiplication process in like manner.The parameter of the first bbo crystal 1 and the second bbo crystal 3 is just the same, so fundamental frequency light experiences multiple all after dates in resonant cavity, the frequency-doubling conversion efficiency of fundamental frequency light will obtain good compensation, the elongation degree in frequency multiplication hot spot section AB along the line direction will tend to consistent with the elongation degree along line segment AD direction, and frequency multiplication hot spot will present good circle.Namely this frequency multiplier can realize higher frequency-doubling conversion efficiency and good frequency doubled light beam quality.
Referring again to Fig. 1, further describe as follows below in conjunction with embodiment to patent of the present invention: make a stylobate in frequency doubling non-linear's device of bbo crystal, 266nm Ultra-Violet Laser is obtained for 532nm green glow frequency multiplication, adopt I type-Ⅱphase matching mode, the parameter that the first bbo crystal 1 and the second bbo crystal 3 adopt is: size 3 × 3 × 8mm
3, cutting angle θ=47.7 °,
(meeting phase-matching condition), logical optical surface are coated with 532nm and 266nm laser antireflective coating; Polarization direction whirligig 2 adopts natural optically-active quartz plate, quartz plate thickness 3.33mm, can by 532nm fundamental frequency light polarization direction half-twist, and surface is coated with 532nm and 266nm laser antireflective coating; Optical direction 4 is perpendicular to each element optical surface.
Be axle half-twist by the second bbo crystal 3 with optical direction 4, and symmetry is positioned over polarization direction whirligig 2 both sides, two crystal are as much as possible near 2, as diagram, the corresponding optical axis direction c ' of some A, B, C, D, E, F corresponding points A ', B ', C ', D ', E ', F ' respectively, optical axis direction c.So, this frequency multiplier is positioned in resonant cavity, 532nm fundamental frequency light experiences multiple all after dates in resonant cavity, narrow frequency multiplication accepts the lower frequency-doubling conversion efficiency of fundamental frequency light that angle causes will by symmetrical bbo crystal to obtaining good compensation, and the shape of frequency multiplication hot spot also can be compensated and become good circle.Namely this frequency multiplier can realize higher frequency-doubling conversion efficiency and good frequency doubled light beam quality.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. the frequency doubling non-linear's device based on bbo crystal, for the generation of resonance intracavity frequency doubling, it is characterized in that, this nonlinear crystal frequency multiplier comprises the first bbo crystal (1), polarization direction whirligig (2) and the second bbo crystal (3), wherein: by the second bbo crystal (3) along optical direction half-twist, then with the first bbo crystal (1) symmetry is positioned over the both sides of this polarization direction whirligig (2);
Wherein, described first bbo crystal (1) and described second bbo crystal (3) are two pieces of identical bbo crystals for frequency multiplication effect of parameter; Described polarization direction whirligig (2) is for by basic frequency laser polarization direction 90-degree rotation.
2. the frequency doubling non-linear's device based on bbo crystal according to claim 1, is characterized in that, described polarization direction whirligig (2) is half-wave plate, natural optical rotation plate, magneto optical modulator or electrooptic modulator.
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| CN103956643A (en) * | 2014-04-29 | 2014-07-30 | 鞍山紫玉激光科技有限公司 | High-efficiency laser harmonic frequency doubling intensifier |
| CN107748472B (en) * | 2017-11-16 | 2023-11-21 | 山东大学 | BBO crystal with special chamfer, frequency tripling optical frequency converter and working method thereof |
| US20230404668A1 (en) * | 2022-06-15 | 2023-12-21 | Foreveryoung Technology Corporation | Apparatus for laser endo-vascular ablation |
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| EP0654876A1 (en) * | 1993-11-12 | 1995-05-24 | Trw Inc. | Birefrigence-compensated alignment-insensitive frequency doubler |
| CN1395132A (en) * | 2002-06-21 | 2003-02-05 | 华东师范大学 | Non-linear frequency changeover crystal |
| CN102109730A (en) * | 2009-12-24 | 2011-06-29 | 福建福晶科技股份有限公司 | Nonlinear crystal frequency multiplier |
| CN202930742U (en) * | 2012-10-30 | 2013-05-08 | 深圳市威鸿博科光电技术有限公司 | Intracavity frequency doubling solid laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001033732A (en) * | 1999-07-15 | 2001-02-09 | Shin Etsu Chem Co Ltd | Optical isolator |
| JP2008167235A (en) * | 2006-12-28 | 2008-07-17 | Fujitsu Ltd | Polarization scrambler device, transmitter, relay device, and polarization scrambler method |
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| EP0654876A1 (en) * | 1993-11-12 | 1995-05-24 | Trw Inc. | Birefrigence-compensated alignment-insensitive frequency doubler |
| CN1395132A (en) * | 2002-06-21 | 2003-02-05 | 华东师范大学 | Non-linear frequency changeover crystal |
| CN102109730A (en) * | 2009-12-24 | 2011-06-29 | 福建福晶科技股份有限公司 | Nonlinear crystal frequency multiplier |
| CN202930742U (en) * | 2012-10-30 | 2013-05-08 | 深圳市威鸿博科光电技术有限公司 | Intracavity frequency doubling solid laser |
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| High-power near diffraction-limeted 1064-nm Nd：YAG rod laser and second harmonic generation by intracavity-frequency-doubling;张树宝 等;《CHINESE OPTICS LETTERS》;20120710;第10卷;071401-1-071401-4 * |
| 强会聚入射时，BBO晶体倍频效率和束腰半径的关系;胡淼 等;《物理学报》;20090331;第58卷(第3期);1719-1725 * |
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