CN100438232C - Quasi-continuous high power red, green double-wavelength laser with LD side pumping - Google Patents
Quasi-continuous high power red, green double-wavelength laser with LD side pumping Download PDFInfo
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- CN100438232C CN100438232C CNB2006101053694A CN200610105369A CN100438232C CN 100438232 C CN100438232 C CN 100438232C CN B2006101053694 A CNB2006101053694 A CN B2006101053694A CN 200610105369 A CN200610105369 A CN 200610105369A CN 100438232 C CN100438232 C CN 100438232C
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Abstract
The invention discloses a diode-pumped quasi-continuous high-power laser with a red wavelength and a green wavelength. It dopes the Nd3 + laser crystals as the working material, and adopts the nonlinear optical crystal frequency technology and acousto-optic technology, and converts the laser in the band of 1.3 micron to 1.0 micron into the dual wavelength pre-continuous laser of green and red through double-frequency method. The invention can achieves a laser output of dual-wavelength of red and green at the same time, or an alternating laser output of dual-wavelength of red and green through the chopper in the resonator.
Description
Technical field
The present invention relates to a kind of laser, particularly quasi-continuous high power red, the green double-wavelength laser of LD profile pump.
Background technology
Since nineteen sixty, first ruby laser was born in the world, all kinds of lasers and laser technology development were very rapid.Wherein, the development of dual laser gets most of the attention, and it has overcome the defective of laser output single wavelength, and vast market and application prospect are all arranged in numerous areas, has become popular research topic both domestic and external.Two red, green double-wavelength laser as three primary colors, with its unique advantage in the visible light wave range scope, in laser medicine, laser color demonstration, laser full color film, atmospheric monitoring and scientific experiment, occupy an important position, theoretical researching value and using value are quite arranged, all have both at home and abroad and utilize nonlinear optical crystal to carry out that laser frequency conversion is red to obtain, the relevant report of green double-wavelength laser.As adopt same plano-concave cavity resonator structure (O Benito, D Jaque, Z D Luo, Y DHuang. " Solid state laser source for simultaneous generation of green and redradiation " J.Phys.D:Appl.Phys.35 (2002) 2711-2715), utilize the fundamental frequency light of 1.3 micron waveband scopes to produce ruddiness through frequency-doubling crystal KTP 1, residue fundamental frequency light and pump light warp and frequency in second nonlinear optical crystal KTP 2 produce green glow, and red, the green laser of dual wavelength is by same output coupling mirror together outside the output cavity.Output when adopting lamp pumping 6 word chambeies and 8 word cavity configurations to realize red, green double-wavelength laser in the Chinese patent application 02117364.8.In above-mentioned two technology, can only export red, green double-wavelength laser simultaneously, and the former exists also efficient lower, the shortcoming of coating technique complexity, the latter adopts the lamp pump mode, and conversion efficiency is low, and the cavity structure complexity is not easy to regulate.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of LD profile pump quasi-continuous high power red, green double-wavelength laser, red, green double-wavelength laser both can be exported simultaneously, also can alternately export, have conversion efficiency height, compact conformation, advantages such as operating cost is low, adjusting is flexible, work safety.
Realize that technical scheme of the present invention is to solve like this: quasi-continuous high power red, the green double-wavelength laser of a kind of LD profile pump, comprise plano-concave total reflection end mirror, be disposed with acousto-optic Q modulation crystal, doping Nd on the horizontal optical path of incident plano-concave total reflection end mirror
3+Laser crystal and LD profile pump source, beam splitter, second harmonic speculum, first frequency-doubling crystal, the first plane reflection end mirror; One side towards beam splitter on the vertical optical path is disposed with second frequency-doubling crystal, the second plane reflection end mirror, and the another side top of beam splitter is provided with the 3rd plane mirror.Doping Nd
3+Laser crystal absorb the energy of LD profile pump source radiation after, form inverted population and distribute, work as Nd
3+Respectively at energy level
4F
3/2-
4I
13/2With
4F
3/2-
4I
11/2Between during transition, just produce the excited fluorescence radiation of 1.3 microns and 1.0 micron waveband scopes, the vibration in corresponding laser resonant cavity separately of the fluorescence of radiation is amplified the back and is formed stable dual wavelength fundamental frequency light, and dual wavelength fundamental frequency light is by plano-concave total reflection end mirror, through acousto-optic Q modulation crystal, doping Nd
3+Laser crystal after incide beam splitter, beam splitter is divided into two light paths, wherein light path is 1.0 micron waveband scopes fundamental frequency light incides first frequency-doubling crystal through the second harmonic speculum, export by the coupling of the first plane reflection end mirror through the frequency multiplication green glow that first frequency-doubling crystal produces, the fundamental frequency light of unconverted returns plano-concave total reflection end mirror by former road, first plane reflection end mirror reflection back, in this process, the frequency multiplication green glow that produces during once more through first frequency-doubling crystal by the second harmonic mirror reflects after again through first frequency-doubling crystal by the coupling output of the first plane reflection end mirror; Another light path is that the fundamental frequency light of 1.3 micron waveband scopes is through the second frequency-doubling crystal frequency multiplication, the second-harmonic red laser that produces and the fundamental frequency light of unconverted together arrive the second plane reflection end mirror, through reflection, fundamental frequency light is once more by after the second frequency-doubling crystal frequency multiplication, residue fundamental frequency light returns plano-concave total reflection end mirror along former road, the ruddiness of twice frequency multiplication generation is together through beam splitter coupling output, by horizontal output after the 3rd plane reflection mirroring.
In the present invention, plano-concave total reflection end mirror constitutes resonant cavity with the first plane reflection end mirror, the second plane reflection end mirror respectively.
Be provided with chopper between described beam splitter and the second harmonic speculum.
Vibrate the fluorescence optical axis direction of the direction of vibration of thin slice in the described chopper, and vibration frequency is adjustable perpendicular to the laser crystal radiation.
Red, green double-wavelength quasi-continuous lasing can be exported simultaneously or realize alternately output by adding chopper.
It is 800～1200mm that the radius of curvature of described plano-concave total reflection end mirror is chosen scope.
The angle of inclination of described beam splitter and horizontal forward angle are 135 °.
The angle of inclination of described the 3rd plane mirror and horizontal forward angle are 45 °, are mutually 90 ° of placements with beam splitter.
Described first frequency-doubling crystal, second frequency-doubling crystal comprise three lithium borates (LBO), beta-barium metaborate (BBO), potassium titanium oxide phosphate (KTP) and other nonlinear optical crystal and optical superlattice crystal.
Described doping Nd
3+Laser crystal comprise neodymium-doped yttrium-aluminum garnet (Nd
3+: YAG), Nd-doped yttrium vanadate (Nd
3+: YVO
4), neodymium-doped yttrium aluminate (Nd
3+: YAP), neodymium-doped yttrium-fluoride lithium (Nd
3+: YLF) wait laser crystal.
In addition,, green double-wavelength output power of laser red for improving can make continuous dual wavelength fundamental frequency light convert the quasi-continuous lasing with high repetition frequency and high-peak power to by the modulating frequency of regulating the acousto-optic Q modulation crystal.
Quasi-continuous high power red, the green double-wavelength laser of LD profile pump of the present invention, adopt the left side end mirror of a plano-concave completely reflecting mirror as resonant cavity, realized the total reflection of dual wavelength fundamental frequency light simultaneously, reduced the element that constitutes laser resonant cavity, made its structure more simple compact; Adopt beam splitter, dual wavelength fundamental frequency light is divided into orthogonal two-way light, it is being vibrated respectively in corresponding resonant cavity separately, each road light can independently be regulated, and makes operation more convenient flexibly; Laser of the present invention both can realize that red, green double-wavelength laser exported simultaneously, can realize alternately output by adding the copped wave device again, make its scope of application more extensive.
Description of drawings
Fig. 1 exports quasi-continuous high power red, green double-wavelength laser structural representation simultaneously for LD profile pump of the present invention;
Fig. 2 alternately exports quasi-continuous high power red, green double-wavelength laser structural representation for LD profile pump of the present invention.
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
Embodiment
With reference to shown in Figure 1, be disposed with acousto-optic Q modulation crystal 5, doping Nd on the horizontal optical path of incident plano-concave total reflection end mirror 1 of the present invention
3+Laser crystal 6 and LD profile pump source 7, beam splitter 8, second harmonic speculum 9, first frequency-doubling crystal 10, the first plane reflection end mirror 2; One side towards beam splitter 8 on the vertical optical path is disposed with second frequency-doubling crystal 11, the second plane reflection end mirror 3, and the another side top of beam splitter 8 is provided with the 3rd plane mirror 4.Plano-concave total reflection end mirror 1 constitutes resonant cavity with the first plane reflection end mirror 2, the second plane reflection end mirror 3 respectively.
With reference to shown in Figure 2, on architecture basics shown in Figure 1, will between beam splitter 8 and the second harmonic speculum 9 chopper 12 be set, promptly constitute the LD profile pump and alternately exported quasi-continuous high power red, green double-wavelength laser.
The embodiment of the invention one is LD profile pump Nd
3+: YAG exports 660nm ruddiness, 532nm green glow dual wavelength quasi-continuous high power laser simultaneously.Shown in accompanying drawing 1, plano-concave total reflection end mirror 1 constitutes resonant cavity with the first plane reflection end mirror 2, the second plane reflection end mirror 3 respectively, is disposed with acousto-optic Q modulation crystal 5, Nd on the horizontal optical path of incident plano-concave total reflection end mirror 1
3+: YAG laser crystal 6, beam splitter 8, second harmonic speculum 9, the first frequency-doubling crystal KTP 10, the first plane reflection end mirror 2; One side towards beam splitter 8 on the vertical optical path is disposed with the second frequency-doubling crystal LBO 11, the second plane reflection end mirror 3, and the another side of beam splitter 8 is provided with the 3rd plane mirror 4.
Plano-concave total reflection end mirror 1 is fixed on the two-dimentional adjustment rack, and concave surface is coated with 1064nm and the double-colored high-reflecting film of 1319nm (reflectivity is all greater than 99.8%); The diameter of the first plane reflection end mirror 2 is Φ=20mm, one side towards the first frequency-doubling crystal KTP 10 is coated with 1064nm high anti-(reflectivity is greater than 99.8%) and the high Double-color film of (transmitance is greater than 99.8%) thoroughly of 532nm, another side plating 532nm anti-reflection film (transmitance is greater than 99.8%); The diameter of the second plane reflection end mirror 3 is Φ=20mm, is coated with 1319nm and the double-colored high-reflecting film of 660nm (reflectivity is all greater than 99.8%) towards the one side of the second frequency-doubling crystal LBO 11.
The diameter of the 3rd plane mirror 4 is Φ=20mm, with horizontal forward angle be 45 °, the one side of object light path is coated with the 660nm film (reflectivity is greater than 99.8%) that is all-trans.
The diameter of beam splitter 8 is Φ=20mm, with horizontal forward angle be 135 °, be coated with to 1319nm high anti-(reflectivity is greater than 99.8%), to the three look films of 660nm and 1064nm high saturating (transmitance is all greater than 99.8%) towards laser crystal 6 one sides, another side is coated with 1064nm anti-reflection film (transmitance is greater than 99.8%).
The diameter of second harmonic mirror 9 is Φ=20mm, and two logical light faces all plate 1064nm anti-reflection film (transmitance is all greater than 99.8%), also is coated with 532nm high-reflecting film (reflectivity is greater than 99.8%) towards the one side of the first frequency-doubling crystal KTP 10.
Laser crystal Nd
3+: Nd among the YAG6
3+Doping content be 1.0%, be of a size of Φ 3 * 10mm, two logical light faces all are coated with 1064nm and the double-colored high transmittance film of 1319nm (transmitance is all greater than 99.8%).
First frequency-doubling crystal 10 is selected the ktp crystal of the critical phase matched of II class for use, is of a size of 3 * 3 * 5mm
3, two logical light faces all are coated with 1064nm and the double-colored anti-reflection film of 532nm (transmitance is all greater than 99.8%), and the side evenly scribbles silver powder and with being put in the water-cooling copper billet behind the indium foil parcel.
Second frequency-doubling crystal 11 is selected the lbo crystal of I class noncritical phase matching for use, is of a size of 3 * 3 * 5mm
3, two logical light faces all are coated with 1319nm and the double-colored anti-reflection film of 660nm (transmitance is all greater than 99.8%), and the side evenly scribbles silver powder and with being put in the water-cooling copper billet behind the indium foil parcel.
Laser crystal 6 all adopts the recirculated water cooling with frequency-doubling crystal 10,11, and the chilling temperature scope is at 16～22 ℃.
Nd
3+: after YAG laser crystal 6 absorbs the energy of LD profile pump source 7 radiation, form inverted population and distribute, work as Nd
3+Respectively at energy level
4F
3/2-
4I
13/2With
4F
3/2-
4I
11/2Between during transition, just producing wavelength is the excited fluorescence radiation of 1319nm and 1064nm, the fluorescence of radiation vibrates in laser resonant cavity and amplifies the stable dual wavelength fundamental frequency light of back formation, dual wavelength fundamental frequency light is by plano-concave total reflection end mirror 1, through the acousto-optic Q modulation crystal 5, laser crystal 6 incides beam splitter 8, beam splitter 8 is divided into two light paths, wherein 1064nm fundamental frequency light incides the first frequency-doubling crystal KTP 10 through second harmonic speculum 9, export by 2 couplings of the first plane reflection end mirror by the 532nm green glow that KTP 10 sends, the fundamental frequency light of unconverted returns plano-concave total reflection end mirror 1 by former road, the first plane reflection end mirror, 2 reflection backs, in this process, after being reflected by second harmonic speculum 9, exports by 2 couplings of the first plane reflection end mirror again the 532nm frequency multiplication green glow that produce through ktp crystal 10 second time; The fundamental frequency light of another light path 1319nm wavelength is through the second frequency-doubling crystal LBO, 11 frequencys multiplication, the 660nm ruddiness that is produced and the fundamental frequency light of unconverted together arrive the second plane reflection end mirror 3, through reflection, 1319nm fundamental frequency light is once more by after the second frequency-doubling crystal LBO, 11 frequencys multiplication, residue fundamental frequency light returns plano-concave total reflection end mirror 1, twice frequency multiplication and produces 660nm ruddiness together through beam splitter 8, the 4 reflection outputs of the 3rd plane mirror along former road.
The embodiment of the invention two is LD profile pump Nd
3+: YAG laser crystal 6 is alternately exported 660nm ruddiness, 532nm green glow dual wavelength quasi-continuous high power laser.Shown in accompanying drawing 2, in this example, chopper 12 is placed between beam splitter 8 and the second harmonic mirror 9, its direction of vibration is perpendicular to the fluorescence optical axis direction of laser crystal 6 radiation.Other optical element is with embodiment one.Regulate the vibration frequency of chopper 12, finely tune each element in the resonant cavity simultaneously, when finally making chopper vibration thin slice on the fluorescence optical axis of laser crystal 6 radiation, 1064nm fundamental frequency light can not starting of oscillation, and the output of 660nm red laser is arranged; When vibration thin slice when departing from this optical axis, 1319nm fundamental frequency light can not starting of oscillation, and the output of 532nm green laser is arranged.
Claims (9)
1, quasi-continuous high power red, the green double-wavelength laser of a kind of LD profile pump comprises plano-concave total reflection end mirror (1), it is characterized in that, is disposed with acousto-optic Q modulation crystal (5), doping Nd on the horizontal optical path of incident plano-concave total reflection end mirror (1)
3+Laser crystal (6) and LD profile pump source (7), beam splitter (8), second harmonic speculum (9), first frequency-doubling crystal (10), the first plane reflection end mirror (2); One side towards beam splitter (8) on the vertical optical path is disposed with second frequency-doubling crystal (11), the second plane reflection end mirror (3), and the another side top of beam splitter (8) is provided with the 3rd plane mirror (4); Doping Nd
3+Laser crystal (6) absorb the energy of LD profile pump source (7) radiation after, form inverted population and distribute Nd
3+Respectively at energy level
4F
3/2-
4I
13/2With
4F
3/2-
4I
11/2Between transition, produce the excited fluorescence radiation of 1.3 microns and 1.0 micron waveband scopes, the vibration in corresponding laser resonant cavity separately of the fluorescence of radiation is amplified the back and is formed stable dual wavelength fundamental frequency light, and dual wavelength fundamental frequency light is by plano-concave total reflection end mirror (1), through acousto-optic Q modulation crystal (5), doping Nd
3+Laser crystal (6) incide beam splitter (8), beam splitter (8) is divided into two light paths, wherein light path is 1.0 micron waveband scopes fundamental frequency light incides first frequency-doubling crystal (10) through second harmonic speculum (9), the frequency multiplication green glow that produces behind first frequency-doubling crystal (10) is by the first plane reflection end mirror (2) coupling output, the fundamental frequency light of unconverted returns plano-concave total reflection end mirror (1) by former road, the first plane reflection end mirror (2) reflection back, produce the frequency multiplication green glow during through first frequency-doubling crystal (10) again, the frequency multiplication green glow of generation is exported by the coupling of the first plane reflection end mirror (2) through first frequency-doubling crystal (10) after being reflected by second harmonic speculum (9); Another light path is that the fundamental frequency light of 1.3 micron waveband scopes is through second frequency-doubling crystal (11) frequency multiplication, the second-harmonic red laser that produces and the fundamental frequency light of unconverted together arrive the second plane reflection end mirror (3), through reflection, fundamental frequency light is once more by after second frequency-doubling crystal (11) frequency multiplication, residue fundamental frequency light returns plano-concave total reflection end mirror (1) along former road, the ruddiness of twice frequency multiplication generation is together through beam splitter (8) coupling output, by the 3rd plane mirror (4) reflection back horizontal output.
2, quasi-continuous high power red, the green double-wavelength laser of LD profile pump according to claim 1 is characterized in that, is provided with chopper (12) between described beam splitter (8) and the second harmonic speculum (9).
3, quasi-continuous high power red, the green double-wavelength laser of LD profile pump according to claim 2, it is characterized in that, vibrate the fluorescence optical axis direction of the direction of vibration of thin slice in the described chopper (12), and vibration frequency is adjustable perpendicular to laser crystal (6) radiation.
4, quasi-continuous high power red, the green double-wavelength laser of LD profile pump according to claim 1 is characterized in that, red, green double-wavelength quasi-continuous lasing is exported simultaneously or realized alternately output by adding chopper (12).
5, quasi-continuous high power red, the green double-wavelength laser of LD profile pump according to claim 1 is characterized in that, it is 800～1200mm that the radius of curvature of plano-concave total reflection end mirror (1) is chosen scope.
6, quasi-continuous high power red, the green double-wavelength laser of LD profile pump according to claim 1 is characterized in that, the angle of inclination of beam splitter (8) and horizontal forward angle are 135 °.
7, quasi-continuous high power red, the green double-wavelength laser of LD profile pump according to claim 1 is characterized in that, the angle of inclination of the 3rd plane mirror (4) and horizontal forward angle are 45 °, is mutually 90 ° of placements with beam splitter (8).
8, quasi-continuous high power red according to claims 1 described LD profile pump, green double-wavelength laser, it is characterized in that, first frequency-doubling crystal (10) comprises three lithium borate LBO, beta-barium metaborate BBO, potassium titanium oxide phosphate KTP and other can be realized any one nonlinear optical crystal of the conversion from 1.0 micron waveband scopes to 0.5 micron waveband scope green glow, and second frequency-doubling crystal (11) comprises three lithium borates (LBO), beta-barium metaborate BBO, potassium titanium oxide phosphate KTP and other can be realized any one nonlinear optical crystal of the conversion from 1.3 micron waveband scopes to 0.6 micron waveband scope ruddiness.
9, quasi-continuous high power red, the green double-wavelength laser of LD profile pump according to claim 1 is characterized in that doping Nd
3+Laser crystal (6) comprise neodymium-doped yttrium-aluminum garnet Nd
3+: YAG, Nd-doped yttrium vanadate Nd
3+: YVO
4, neodymium-doped yttrium aluminate Nd
3+: YAP, neodymium-doped yttrium-fluoride lithium Nd
3+: the YLF Lasers crystal.
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| CN101499604B (en) * | 2008-01-31 | 2012-05-09 | 中国科学院福建物质结构研究所 | Dual wavelength frequency double laser |
| EP2454753B1 (en) * | 2009-07-14 | 2016-10-05 | Philips Lighting Holding B.V. | Color temperature variable light emitter |
| CN102130420A (en) * | 2011-01-27 | 2011-07-20 | 山东大学 | Dual-wavelength (1106nm and 1110nm) laser device |
| CN104143758A (en) * | 2013-05-07 | 2014-11-12 | 许洋 | Control system of all-solid-state pulser based on frequency doubling technology |
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| JPH09205244A (en) * | 1996-01-25 | 1997-08-05 | Ushio Inc | Ultraviolet ray laser device |
| WO2003084014A1 (en) * | 2002-03-28 | 2003-10-09 | Commissariat A L'energie Atomique | High peak power laser cavity and assembly of several such cavities |
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2006
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09205244A (en) * | 1996-01-25 | 1997-08-05 | Ushio Inc | Ultraviolet ray laser device |
| WO2003084014A1 (en) * | 2002-03-28 | 2003-10-09 | Commissariat A L'energie Atomique | High peak power laser cavity and assembly of several such cavities |
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