CN1327282A - Multiple wavelength laser with acousto-optic Q modulation - Google Patents
Multiple wavelength laser with acousto-optic Q modulation Download PDFInfo
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- CN1327282A CN1327282A CN 01119589 CN01119589A CN1327282A CN 1327282 A CN1327282 A CN 1327282A CN 01119589 CN01119589 CN 01119589 CN 01119589 A CN01119589 A CN 01119589A CN 1327282 A CN1327282 A CN 1327282A
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Abstract
The laser uses one of Nd:YAG, Nd:YVO4, Nd:YLF and Nd:BEL as laser medium, and under the pump of lamp or semiconductor laser as pump source, dual wavelegnth laser oscillations in both 1.0 micron and 1.3 microns wavelength may be output in one single laser crystal bar. The laser cavity has one acousto-optical Q modulator, and the laser operates in the acousto-optical Q modulator state with high peak power to output one or two of the two wavelengths or coherent radiation produced by the non-linear optical frequency-varying crystal. The acousto-optical Q modulator consists of one acousto-optical modulating crystal to modulate both 1.0 micron and 1.3 micro channels with less insertion loss and high power.
Description
The multiple-wavelength laser of acousto-optic Q modulation of the present invention belongs to optoelectronic areas.It can export the optical maser wavelength of multiple first-harmonic and the coherent radiation of additive mixing thereof simultaneously at single laser crystal, can be applicable to many aspects such as laser medicine, laser processing, laser communications.
There is the people in past the laser of a kind of fundamental wavelength of output and a laser of non-linear frequency doubled light thereof, is called dual laser.And usually the multiple-wavelength laser that refers to of people should be at can vibrate the simultaneously laser of at least two kinds of fundamental wavelengths of single laser crystal, also can contain the coherent radiation of its additive mixing sometimes.
Because multiple-wavelength laser has purposes very widely, is the project of international in recent years extensive concern and research.Because trivalent neodymium ion (Nd
3+) there are two main wave bands in laser crystal, promptly by
4F
3/2-
4I
11/2The 1.0 mu m waveband fundamental wave of lasers that the transition of energy level produces and by
4F
3/2→
4I
13/2The 1.3 mu m waveband fundamental wave of lasers that energy level produces (to the Nd:YAG crystal, are the laser of 1064nm and 1319nm or 1338nm; To Nd:YVO
4Crystal is the laser of 1064nm and 1342nm; To the Nd:YAP crystal, be the laser of 1079.5nm and 1341.4 nm; To the Nd:YLF crystal, the laser of 1047nm and 1313nm; To the Nd:BEL crystal, laser for 1064nm and 1351nm), and the transition cross section σ of two kinds of wavelength lasers differs bigger, and different laser crystals is the ratio of two kinds of wave band transition cross sections different again (seeing Table 1), allow the first-harmonic of two kinds of wave bands vibrate simultaneously and just require to adopt relevant monotechnics.We had once set up first in the world Dual Wavelength Crystal Lasers (Shen Hongyuan etc., " the Comparison of of running continuously
The basic parameter of some neodymium-doped laser crystals of table 1.
Simultaneous multiple wavelength lasing in various neodymium hostcrystals at transitions from
4F
3/2To
4I
11/2And
4I
13/2", Applied physicsletters, (1990), 56 (20), 1937), be implemented in and export 33.7W1.0795 μ m laser and 30W 1.3414 μ m laser on the Nd:YAP crystal simultaneously.In the past, we have measured Nd
3+Ion is in the YAP crystal
4F
3/2-
4I
13/2The cross section σ of transition (Shen Hongyuan etc., " Measurementof the Stimulated Emmission Cross section for
4F
3/2-
4I
13/2Transition of Nd
3-In YAlO
3Crystal ", IEEEJ.Quantum Electron., 1989, Vol.25, No.2,144), it is more than 2.4 times of crystal transition cross section such as Nd:YAG, Nd:YLF and Nd:BEL, it is easy to realize continuous dual wavelength running.In addition, we have also obtained the laser (Lin Wenxiong of the dual wavelength long pulse running simultaneously of macro-energy, Shen Hongyuan etc., " experimental study of double-wavelength pulse Nd:YAG laser ", " Chinese laser ", 1994, Vol.A.21, No.289.), the additive mixing that reaches under long pulse is exported (Lin Wenxiong, " Tripling theharmonic generation of a 1341.4nm Nd:YAP laser in LiIO such as Shen Hongyuan
3And KTPcrystals to get 447.1nm blue coherent radiation ", Optics Communications, 1991,82 (3-4): 333-336; Shen Hongyuan, Lin Wenxiong etc., " Second harmonic generationand sum requency mixing of dual wavelength Nd:YAlO
3Laser to 413.7nmviolet coherent radiation in LiIO
3Crystal ", Journal of AppliedPhysics (1992), 72 (9) 4472.).In addition, export the research work of several fundamental wavelengths at same laser crystal simultaneously and also carried out some in the world, as United States Patent (USP) " DualWavelength Solid State laser " 5,708,672; Chen Y F; CW dual-wavelength operation of a diode-end-pumped Nd:YVO4 laser, APPLIEDPHYSICS B-LASERS AND OPTICS, (2000) Vol.70, No.4,475.
| Crystal | Nd：YAG | Nd：YLF | Nd：BEL | Nd：YAlO 3 | Nd：YVO 4 |
| Fluorescence lifetime τ (μ s) | 230 | 480 | 144 | 150 | 99 |
| 4F 3/1- 4I 13/2Wavelength (nm) | 1338/1318 | 1313 | 1351 | 1341.4 | 1342 |
| σ 1(×10- 19cm 2) | 0.9/0.92 | 0.6 | 0.4 | 2.2 | 6.0 |
| σ 1·τ(×10- 19cm 2·μs) | 207/211.6 | 288 | 57.6 | 330 | 594 |
| 4F 3/2- 4I 11/2Wavelength (nm) | 1064 | 1047 | 1070 | 1079.5 | 1064 |
| σ 2(×10- 19cm 2) | 4.6 | 3.2/2.6 | 2.1 | 4.6 | 18.6 |
Laser behind the acousto-optic Q modulation has improved several energy levels than peak power continuous, the long pulse working method, because its pulse width, account for wide ratio and diminished, its thermal burn effect to human body can significantly reduce in laser medicine, and the laser output of its average power ratio after electric-optically Q-switched is many greatly; In addition, because peak power improves, conversion efficiency and square nonlinear optics frequency conversion coherent radiation that is directly proportional also raising greatly thereupon with peak power.Therefore, the multiple-wavelength laser of acousto-optic Q modulation has application promise in clinical practice.From present domestic and international present Research, the first-harmonic that does not relate to two wave bands of same laser crystal as yet works in the acousto-optic Q modulation state simultaneously.And generally use acousto-optic modulator, in the chamber, also only a kind of wavelength is played on-off action.
The objective of the invention is to disclose a kind of use acousto-optic modulator and can make a kind of Nd ion doped laser crystal, 1.0 mu m wavebands and 1.3 mu m waveband lasers are vibrated simultaneously and be operated in the multiple-wavelength laser of acousto-optic Q modulation state, make a laser have the effect of multi-station laser.
Realize technical scheme of the present invention as shown in Figure 3.
At first laser crystal adopts Nd:YAG, Nd:YVO
4Nd:YAP, Nd:YLF, a kind of among the Nd:BEL, under lamp pump or semiconductor laser array pumping, produce the population inversion energy storage, interpolation is gone into acousto-optic modulator in the chamber, with the parameters such as preceding Effect of Back-Cavity Mirror of different Nd-doped crystal laser materials at the product σ τ of the transition cross section σ of 1.0 mu m wavebands and 1.3 mu m wavebands and fluorescence lifetime τ design resonant cavity, can be referring to dual wavelength while vibration theory (Shen Hongyuan etc., " the Comparison of simultaneous multiple wavelength lasing in variousneodymium host crystals at transitions from of our foundation
4F
3/2To
4I
11/2And
4I
13/2", Applied physics letters, (1990), 56 (20), 1937), promptly under injecting, specific pump power make the running laser competitiveness of two kinds of wavelength suitable, and the dual wavelength that is implemented under the acousto-optic Q modulation state turns round simultaneously.Common acousto-optic modulator is all only to a certain single wavelength modulation, and acousto-optic modulator of the present invention can be modulated 1.0 mu m wavebands and 1.3 mu m wavebands in an acousto-optic crystal simultaneously.This just requires: the acoustooptic modulation crystal of 1) selecting for use is to 1.0 mu m wavebands and the little acousto-optic crystal material of 1.3 mu m waveband absorption coefficients, 2) plate the anti-reflection film of 1.0 mu m wavebands and 1.3 mu m wavebands at two end faces of acousto-optic modulator crystal.So just can guarantee that the acoustooptic modulation crystal that inserts can not introduce excessive insertion loss.
From the fundamental wave that the multiple-wavelength laser of above acousto-optic Q modulation is exported, also can realize the nonlinear optics frequency inverted by the nonlinear optics frequency-changer crystal that adds.
Laser of the present invention adopts an acousto-optic modulator crystal to constitute acousto-optic modulator, fundamental wave to two wave bands carries out switch modulation, has avoided each negative factor such as the long long and unfavorable high power running of insertion loss and chamber of introducing with an acousto-optic modulator of two kinds of fundamental waves; Under acoustooptic modulation, make the big raising of peak power of two wave band first-harmonics of laser, thereby improve the coherent radiation output that its nonlinear optics frequency conversion produces greatly.Therefore can be widely used in a plurality of fields such as laser medicine, laser processing, laser communications field.
The present invention with compare the useful effect that is had with background technology: existing correlative study and the report all be to allow two first-harmonics of crystal and double-wavelength laser operate at continuously, quasi-continuous, long pulse and electric-optically Q-switched operating state, and the present invention runs on the acoustooptic modulation state, it is more much higher than electric-optically Q-switched working method average power, peak power than continuous or quasi-continuous lasing improves several magnitude again, therefore if be used on the laser medicine, because the time accounts for wide smaller, this will allow biological tissue that the slow Henan time of certain heat is arranged, and make the infringement of thermal burn reduce greatly; Because the raising of peak power, also make the easier cutting of laser biological tissue, vivid saying is " laser knife is sharper "; The present invention adopts an acoustooptic modulation crystal to constitute acousto-optic modulator, fundamental wave to two wave bands carries out switch modulation simultaneously, avoided each the insertion loss introduced with an acoustooptic modulation crystal of two kinds of fundamental waves and chamber long long and be unfavorable for that high power running etc. bears and factor; In addition, because the raising of peak power, the nonlinear optics frequency conversion transformation efficiency in the chamber or outside the chamber has improved several magnitude, thereby output has the coherent radiation of actual application value.
Below accompanying drawing is made brief description:
Fig. 1 is the pie graph of the acousto-optic Q modulation multiple-wavelength laser example of lamp pumping Nd:YAG of the present invention;
Fig. 2 is the pie graph of the acousto-optic Q modulation multiple-wavelength laser example of the laser diode side pumped Nd:YAG of the present invention.
Now further describe the embodiment of this programme in conjunction with the accompanying drawings:
Embodiment one:
(1) is the Nd:YAG crystal among Fig. 1, (2) be pumping with krypton lamp or xenon lamp, (3) be the optical filtering pipe of elimination pumping lamp ultra-violet radiation, (4) hard-pressed bale formula ellipse or round laser pump cavity, be full of the medium cooling fluid in the chamber, cooling work material and pumping lamp, (5) be dielectric mirror to the optical maser wavelength total reflection, (6) be the outgoing mirror of laser, it is to the output degree of coupling difference of two kinds of first-harmonics, thereby make the loss difference of two kinds of wavelength lasers, satisfy oscillating condition simultaneously to reach dual wavelength, (7) are self-loopa cooling devices, (8) be power supply, can to be output current increase continuously 30 amperes uninterruptable power from 0 for it, or the output average current is increased to 30 amperes the suitable repetition rate power supply of pulse duration from 0, perhaps exports the pulse power of energy adjustable, (9) acousto-optic modulator, it is the fused quartz modulator, and fused quartz is selected for use as far as possible and taken off OH root timber material, can avoid it at 1.3 mu m waveband OH roots stronger absorption loss to be arranged like this.Fused quartz size 8 * 25 * 50mm plates the reflectivity of 1.0 mu m wavebands and 1.3 mu m wavebands less than 0.5% broad-band transparence-increased film.Water flowing cooling acousto-optic modulator during work, (10) are the water circulation cooling devices of acousto-optic modulator.During work, if insert the nonlinear optics frequency-changer crystal in the chamber or outside the chamber, and the degree of coupling of corresponding adjustment resonator mirror, can obtain the coherent radiation output of higher conversion efficiency easily.
Embodiment two:
Among Fig. 2 (1) be the Nd:YAG crystal, with a plurality of LD (12) side-pumping, with the pump light vertical direction on heat sink (not the drawing among the figure) of semiconductor cooler refrigeration, extract the heat that the operation material operation process produces, (5), (6) are total reflection dielectric mirror and the output medium mirrors similar to Fig. 1, (9) acousto-optic modulator, it is the fused quartz modulator, and fused quartz is selected for use as far as possible and taken off OH root timber material, can avoid it at 1.3 mu m waveband OH roots stronger absorption loss to be arranged like this.Fused quartz size 8 * 25 * 50mm plates the reflectivity of 1.0 mu m wavebands and 1.3 mu m wavebands less than 0.5% broad-band transparence-increased film.Water flowing cooling acousto-optic modulator during work, (10) are the water circulation cooling devices of acousto-optic modulator, (11) are the drive sources of LD semiconductor laser.During work, if insert the nonlinear optics frequency-changer crystal in the chamber or outside the chamber, and the degree of coupling of corresponding adjustment resonator mirror, can obtain the coherent radiation output of higher conversion efficiency easily.
Claims (2)
1. the multiple-wavelength laser of an acousto-optic Q modulation, be to be laser-activated medium with a kind of in Nd:YAG, Nd:YVONd:YAP, Nd:YLF, the Nd:BEL laser crystal, is under the pumping source at lamp (krypton lamp or xenon lamp) for pumping source or with the semiconductor laser, in a laser crystal bar, export the laser generation of 1.0 mu m wavebands and two kinds of first-harmonics of 1.3 mu m wavebands simultaneously, to the Nd:YAG crystal, the dual-wavelength laser of vibrate simultaneously 1064nm, 1319nm or 1338nm; To Nd:YVO
4Crystal, the dual-wavelength laser of vibrate simultaneously 1064nm, 1342nm; To the Nd:YAP crystal, the dual-wavelength laser of vibrate simultaneously 1079.5nm, 1341.4nm; To the Nd:YLF crystal, the dual-wavelength laser of vibrate simultaneously 1047nm, 1313nm; To the Nd:BEL crystal, the dual-wavelength laser of 1064nm, 1351nm simultaneously vibrates, acousto-optic modulator is arranged in the chamber, the dual-wavelength laser of vibration runs on the accent Q acousto-optic modulator state of high-peak power, one or both first-harmonics in this device output dual wavelength, or output is characterized in that through the coherent radiation of the outer nonlinear optics frequency-changer crystal generation in the placed cavity or chamber: described multiple-wavelength laser intracavitary unit has the laser of two kinds of first-harmonics that 1.0 mu m wavebands and 1.3 mu m wavebands are vibrated simultaneously to carry out the acousto-optic modulator of acousto-optic Q modulation;
2. the multiple-wavelength laser of acousto-optic Q modulation as claimed in claim 1, it is characterized in that: described acousto-optic modulator is made of an acoustooptic modulation crystal, it is the fused quartz modulator, and fused quartz is selected for use and taken off OH root timber material, plates the broad-band transparence-increased film to 1.0 mu m wavebands and 1.3 mu m wavebands.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01119589 CN1200492C (en) | 2001-05-22 | 2001-05-22 | Multiple wavelength laser with acousto-optic Q modulation |
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|---|---|---|---|
| CN 01119589 CN1200492C (en) | 2001-05-22 | 2001-05-22 | Multiple wavelength laser with acousto-optic Q modulation |
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| CN1327282A true CN1327282A (en) | 2001-12-19 |
| CN1200492C CN1200492C (en) | 2005-05-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100469334C (en) * | 2002-11-04 | 2009-03-18 | 中国科学院福建物质结构研究所 | Multifuncational laser face care |
| CN101764349B (en) * | 2010-01-20 | 2011-05-25 | 武汉梅曼激光有限公司 | Solid laser for metal depth etching |
| CN102637995A (en) * | 2012-04-25 | 2012-08-15 | 天津大学 | Dual-wavelength or multi-wavelength laser with adjustable power proportion |
| CN101459314B (en) * | 2007-12-11 | 2012-10-03 | 中国科学院福建物质结构研究所 | Multifunctional laser therapeutic machine |
| CN104143758A (en) * | 2013-05-07 | 2014-11-12 | 许洋 | Control system of all-solid-state pulser based on frequency doubling technology |
| CN106825943A (en) * | 2017-02-23 | 2017-06-13 | 江苏大学 | It is applied to PLC wafer lasers cutter sweep and the picosecond laser with the device |
-
2001
- 2001-05-22 CN CN 01119589 patent/CN1200492C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100469334C (en) * | 2002-11-04 | 2009-03-18 | 中国科学院福建物质结构研究所 | Multifuncational laser face care |
| CN101459314B (en) * | 2007-12-11 | 2012-10-03 | 中国科学院福建物质结构研究所 | Multifunctional laser therapeutic machine |
| CN101764349B (en) * | 2010-01-20 | 2011-05-25 | 武汉梅曼激光有限公司 | Solid laser for metal depth etching |
| CN102637995A (en) * | 2012-04-25 | 2012-08-15 | 天津大学 | Dual-wavelength or multi-wavelength laser with adjustable power proportion |
| CN104143758A (en) * | 2013-05-07 | 2014-11-12 | 许洋 | Control system of all-solid-state pulser based on frequency doubling technology |
| CN106825943A (en) * | 2017-02-23 | 2017-06-13 | 江苏大学 | It is applied to PLC wafer lasers cutter sweep and the picosecond laser with the device |
| CN106825943B (en) * | 2017-02-23 | 2018-10-09 | 江苏大学 | Applied to PLC wafer lasers cutter device and with the picosecond laser of the device |
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| Publication number | Publication date |
|---|---|
| CN1200492C (en) | 2005-05-04 |
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