CN101777724B - End-pumped dual-wavelength coaxial switching output Q-switched base-frequency and double-frequency laser - Google Patents
End-pumped dual-wavelength coaxial switching output Q-switched base-frequency and double-frequency laser Download PDFInfo
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- CN101777724B CN101777724B CN2009102733951A CN200910273395A CN101777724B CN 101777724 B CN101777724 B CN 101777724B CN 2009102733951 A CN2009102733951 A CN 2009102733951A CN 200910273395 A CN200910273395 A CN 200910273395A CN 101777724 B CN101777724 B CN 101777724B
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- 230000010287 polarization Effects 0.000 claims abstract description 50
- 239000013078 crystal Substances 0.000 claims abstract description 34
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 4
- QBLDFAIABQKINO-UHFFFAOYSA-N barium borate Chemical compound [Ba+2].[O-]B=O.[O-]B=O QBLDFAIABQKINO-UHFFFAOYSA-N 0.000 claims description 3
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 3
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 2
- RIUWBIIVUYSTCN-UHFFFAOYSA-N trilithium borate Chemical class [Li+].[Li+].[Li+].[O-]B([O-])[O-] RIUWBIIVUYSTCN-UHFFFAOYSA-N 0.000 claims description 2
- OFHMUASCSJJNNA-JOCHJYFZSA-N bis-napthyl β-ketophosphonic acid Chemical compound C1=CC=C2C([C@H](C(=O)C=3C=C4C=CC=CC4=CC=3)P(O)(=O)O)=CC=CC2=C1 OFHMUASCSJJNNA-JOCHJYFZSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 20
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Abstract
The invention relates to an end-pumped dual-wavelength coaxial switching output Q-switched base-frequency and double-frequency laser which comprises a linear polarized Q-switched laser source, a steering mirror, a focusing mirror, a non-linear double-frequency crystal, a collimating mirror, a harmonic separation mirror, a polarization rotator and a pinhole aperture. By a Q-switched mode, linear-polarization, high-peak-value, accurate-power and continuous base-frequency infrared light is output; then, the output base-frequency light is focused by a lens on a non-linear double-frequency crystal arranged outside a cavity to generate fine light spots with high base-frequency light power density; and green light is output from the double-frequency crystal. After the polarization rotator is inserted in (or moved out of ) a light path, and the harmonic separation mirror is moved (or inserted), the polarization direction of the base-frequency infrared light turns at 90 degrees, the double-frequency process does not occur, and the laser is switched to output base-frequency infrared light. The laser output by two kinds of switching has coaxial transmission characteristics, passes through the same focusing system and has approximate consistent focusing parameters. The invention can maximize the system efficiency when the two wavelengths are switched and output, thereby being widely applied to the fields of industrial processing, scientific research, medical treatment, military affairs, and the like.
Description
Technical field
The invention belongs to laser technology field, the dual-wavelength coaxial switching output Q-switched fundamental frequency of particularly a kind of laser diode end-face pump, frequency double laser.
Technical background
Most in the market end-pumped laser all is the single wavelength way of output.This mode compact conformation, beam quality is better, and efficient is higher; Double-frequency laser based on end pump technology adopts the intracavity frequency doubling mode mostly, can utilize the high power density in the chamber to obtain bigger double-frequency laser output, but this mode runs into the less stable problem that the longitudinal mode competition causes easily.In order satisfying different materials optionally to be processed, to be needed the different wavelength of laser device usually.Especially need basic frequency laser and double-frequency laser alternately to add man-hour, have to use two lasers to be used alternatingly.System complexity is higher, has not only increased cost, has also increased operation.The dual laser that utilizes the spectral characteristic of laser crystal self to process can obtain two kinds of basic frequency laser wavelength outputs, but can not obtain double-frequency laser output, and can not be with the laser of two kinds of wavelength of switching mode output alternately.Minority macro-energy dual wavelength or multiple-wavelength laser utilize cavity external frequency multiplication and the mode output that produces two or more wavelength lasers frequently, but generally are that the outgoing route of different wave length is different, and various wavelength is produced simultaneously, and utilance is lower.
Summary of the invention
The object of the invention is existing such as problems such as less stable, efficient deficiency and light beam disalignments and a kind of end-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency, frequency double laser are provided in order to solve in the above-mentioned prior art just.This laser structure is simple flexibly; The not constraint of Stimulated Light resonator design structure; Adopt to focus on the frequency multiplication mode and remedied the shortcoming that the cavity external frequency multiplication power density is lower than the intracavity frequency doubling mode; Can freely select the focusing beam waist of fundamental frequency light on non-linear frequency-doubling crystal, to obtain best frequency-doubling conversion efficiency.Whether control the frequency multiplication process with the mode of basic frequency laser polarization direction and take place, do not change propagation path, different wave length, light beam parameters is consistent with coaxial manner if propagating.
The objective of the invention is to realize: can obtain littler laser beam waist size after the linear polarization basic frequency laser that utilizes pulse to export focuses on through condenser lens, thereby increase laser power density greatly through following scheme.Basic frequency beam waist position after logical optical lens focuses on overlaps with the incident end face of frequency-doubling crystal, thereby obtains best frequency-doubling conversion efficiency.With the polarization direction of polarization rotator change basic frequency laser, whether control frequency multiplication process takes place, and cooperates the harmonic separation mirror, switches alternately exporting of basic frequency laser and double-frequency laser.
A kind of end-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency, frequency double laser; It comprises lasing light emitter (1), polarization rotator (3), condenser lens (6), frequency-doubling crystal (7), collimating lens (8), aperture (11), harmonic separation mirror (12), deviation mirror (4,5,9,10); It is characterized in that; The laser beam (2) of lasing light emitter (1) output is the linear polarization adjusting Q pulse laser, and deviation mirror (4,5,9,10), polarization rotator (3), focus lamp (6), frequency-doubling crystal (7), collimating lens (8), aperture (11), harmonic separation mirror (12) are placed on outside the resonant cavity; Linear polarization pulse laser (2) by lasing light emitter (1) produces is adjusted incident direction through deviation mirror (4,5); Focus on the incident end face of non-linear frequency-doubling crystal (7) and produce frequency multiplication green laser (13) through the condenser lens (6) that is arranged on the outer certain position of resonant cavity, pass through deviation mirror (9,10) then and adjust exit direction with remaining basic frequency laser (2) passes through collimating lens (8) collimation again; Harmonic separation mirror (12) reflects remaining basic frequency laser (2) and sees through double-frequency laser (13); Aperture (11) absorbs the residue basic frequency laser that is reflected, and avoids other elements of reverberation damage; The polarization direction of polarization rotator (3) control basic frequency laser (2), behind the insertion polarization rotator (3), the polarization direction of basic frequency laser (2) rotates 45 degree or 90 degree around direction of beam propagation.
End-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency of the present invention, frequency double laser, its polarization rotator are quarter wave plate or 1/2 wave plate or 45 quartzy gyrotropi crystals of degree or the quartzy gyrotropi crystal of 90 degree.
The LASER Light Source (1) of end-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency of the present invention, frequency double laser is the pulse laser of linear polarization.
End-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency of the present invention, frequency double laser, its polarization rotator (3) insert in frequency-doubling crystal (7) light path before, the polarization direction of linear polarization fundamental frequency light (2) rotation 45 degree or 90 degree, and the frequency multiplication process does not take place; Or polarization rotator (3) do not insert in frequency-doubling crystal (7) light path before, and the frequency multiplication process does not take place:
According to the nonlinear optics principle, the refractive index of the laser of different wave length, different polarization direction and different incident directions when the nonlinear crystal internal communication is different.For the frequency multiplication process, to have only when basic frequency laser (2) and double-frequency laser (13) refractive index during at nonlinear crystal (7) internal communication equates, when promptly satisfying phase-matching condition, the frequency multiplication process could take place.
To satisfying the frequency multiplication process of phase-matching condition, be divided into I class phase matched and II class phase matched.When adopting I class phase matched, the polarization direction of linear polarization fundamental frequency light (2) is revolved and is turn 90 degrees, and the frequency multiplication process takes place or do not take place; When adopting II class phase matched, polarization direction rotation 45 degree of linear polarization fundamental frequency light (2), the frequency multiplication process takes place or does not take place.
Non-linear frequency-doubling crystal of the present invention (7) is potassium dihydrogen phosphate (KDP) or three lithium borates (LBO) or KTP (KTP) or barium metaborate (BBO) nonlinear optical crystal.
End-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency of the present invention, frequency double laser, its deviation mirror (4,5,9,10) can not use or only use wherein some, and the mode of placement and steering angle can change.
End-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency of the present invention, frequency double laser, its basic frequency laser and double-frequency laser that switches output has coaxial output characteristic.
The present invention is suitable for the application in the fields such as pumping source, laser medicine and scientific research of laser marking, laser scoring, laser scribing, other laser.
Description of drawings
Fig. 1: end-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency, frequency double laser structural representation;
Fig. 2: nonlinear crystal frequency multiplication principle schematic;
Fig. 3: polarization rotator operation principle sketch map;
Among Fig. 2,7 is non-linear frequency-doubling crystal, and 2 is the basic frequency laser of linear polarization, and 13 is the double-frequency laser of linear polarization.Only when satisfying the nonlinear optics phase-matching condition, non-linear frequency multiplication process could take place for the basic frequency laser 2 of linear polarization and double-frequency laser 13.According to the nonlinear optics principle, the refractive index of the laser of different wave length, different polarization direction and different incident directions when the nonlinear crystal internal communication is different.For the frequency multiplication process, to have only when basic frequency laser 2 when the refractive index during at nonlinear crystal 7 internal communications equates with double-frequency laser 13, the frequency multiplication process could take place.
Among Fig. 3,3 is polarization rotator, can be wave plate or quartzy gyrotropi crystal, and linear polarization basic frequency laser 2 is through behind the polarization rotator, and the polarization direction changes, and rotates to an angle around the direction of propagation---45 degree or 90 degree.After the change of polarized direction of basic frequency laser 2, no longer satisfy (or just satisfying) nonlinear phase matching condition, (or generation) do not take place in the frequency multiplication process.
Embodiment
End-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency, frequency double laser involved in the present invention, its technical scheme combine accompanying drawing 1,2 and 3 to be described in detail as follows:
The linear polarization basic frequency laser 2 of basic frequency laser of the present invention source 1 pulse output; The basic frequency laser 2 of pulse output changes the direction of propagation through deviation mirror 4 and 5 (all plating fundamental frequency light high-reflecting film); The basic frequency laser 2 of pulse output focuses on non-linear frequency-doubling crystal 7 (LBO by the condenser lens 6 (coating basic frequency light anti-reflection film) that is placed on the outer certain position of resonant cavity; Two-sided fundamental frequency light and the frequency doubled light anti-reflection film of all plating) on the incident end face, and in the crystal 7 inner nonlinear frequency transformation processes that form; Behind the double-frequency laser 13 and remaining fundamental frequency light 2 process lens 8 (two-sided fundamental frequency light and the frequency doubled light anti-reflection film of all plating) collimations by frequency-doubling crystal 7 generations; Change the direction of propagation by deviation mirror 9 and 10 (all plating fundamental frequency light and frequency doubled light high-reflecting film) again, and through aperture 11; Harmonic separation mirror 12 (plating 0 degree frequency doubled light anti-reflection film and fundamental frequency light high-reflecting film) output double-frequency laser also reflects basic frequency laser; When in light path, inserting polarization rotator 3 (two-sided coating basic frequency light anti-reflection film), the polarization direction of basic frequency laser rotation 45 degree or 90 degree, frequency multiplication process or do not take place shifts out harmonic separation mirror 12 on light path, have only basic frequency laser output.
Concrete design example is following: on light path, place laser each several part device according to Fig. 1, comprise linear polarization pulsed base frequency laser source 1, polarization rotator 3; Condenser lens 6, frequency-doubling crystal 7, collimating lens 8; Aperture 11, harmonic separation mirror 12 and deviation mirror 4,5,9,10.The standard that power output is stable swashs pulsed base frequency laser 2 continuously and changes transmission path and play the effect that increases light path through deviation mirror 4 and 5; Be about 300mm place placement focal length apart from the actual optical path length of the output of light source 1 is the condenser lens 6 of 50mm; With basic frequency laser 2 focusing transform is that beam waist diameter is about the 0.1mm focused beam, and beam waist position is the incident end face place of the non-linear frequency-doubling crystal 7 of 10mm in length.The double-frequency laser that produces is vertical each other with the polarization direction of basic frequency laser---and as shown in Figure 2; After in light path, inserting polarization rotator 3, the polarization direction of basic frequency laser is revolved around the direction of propagation and is turn 90 degrees---and as shown in Figure 3, the frequency multiplication process takes place or does not take place.When harmonic separation mirror 12 is placed in the light path, only export double-frequency laser, remaining basic frequency laser is reflected and is absorbed by aperture 11; When in light path, removing harmonic separation mirror 12, only export basic frequency laser, no frequency multiplication process takes place.
Claims (3)
1. an end-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency, frequency double laser; It comprises lasing light emitter (1), polarization rotator (3), condenser lens (6), frequency-doubling crystal (7), collimating lens (8), aperture (11), harmonic separation mirror (12), first deviation mirror (4), second deviation mirror (5), the 3rd deviation mirror (9), the 4th deviation mirror (10); It is characterized in that; The laser beam (2) of lasing light emitter (1) output is the linear polarization adjusting Q pulse laser, and first deviation mirror (4), second deviation mirror (5), the 3rd deviation mirror (9), the 4th deviation mirror (10), polarization rotator (3), condenser lens (6), frequency-doubling crystal (7), collimating lens (8), aperture (11), harmonic separation mirror (12) are placed on outside the resonant cavity; Linear polarization adjusting Q pulse laser bundle (2) by lasing light emitter (1) produces is adjusted incident direction through first deviation mirror (4), second deviation mirror (5); Focus on the incident end face of frequency-doubling crystal (7) and produce frequency multiplication green laser (13) through being arranged on the outer condenser lens (6) of resonant cavity, adjust exit direction through the 3rd deviation mirror (9), the 4th deviation mirror (10) then with remaining laser beam (2) passes through collimating lens (8) collimation again; Harmonic separation mirror (12) reflects remaining laser beam (2) and sees through double-frequency laser (13); Aperture (11) absorbs the residue laser beam that is reflected; After inserting polarization rotator (3), the polarization direction of laser beam (2) rotates 45 degree or 90 degree around direction of beam propagation.
2. end-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency according to claim 1, frequency double laser; It is characterized in that the polarization rotator (3) that is placed on outside the chamber is quarter wave plate or 1/2 wave plate or 45 quartzy gyrotropi crystals of degree or the quartzy gyrotropi crystal of 90 degree.
3. end-pumped dual-wavelength coaxial switching output Q-switched fundamental frequency according to claim 1 and 2, frequency double laser is characterized in that, frequency-doubling crystal (7) is potassium dihydrogen phosphate or three lithium borates or KTP or barium metaborate nonlinear optical crystal.
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| CN2009102733951A CN101777724B (en) | 2009-12-25 | 2009-12-25 | End-pumped dual-wavelength coaxial switching output Q-switched base-frequency and double-frequency laser |
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| CN102386555B (en) * | 2010-08-30 | 2012-11-21 | 吉林省科英激光技术有限责任公司 | Multi-wavelength laser generation unit |
| CN102163794A (en) * | 2011-02-25 | 2011-08-24 | 天津梅曼激光技术有限公司 | Laser device capable of freely switching laser between 1064nm wavelength and 355nm wavelength |
| CN102244346B (en) * | 2011-06-14 | 2013-03-13 | 华北电力大学（保定） | End-pumped laser utilizing half-wave plates |
| CN103368056B (en) * | 2013-07-22 | 2015-06-17 | 中国科学院半导体研究所 | Multi-wave-length laser switching and outputting device |
| CN106785874A (en) * | 2017-03-03 | 2017-05-31 | 深圳市杰普特光电股份有限公司 | Laser and its frequency multiplication module |
| CN107863680A (en) * | 2017-12-29 | 2018-03-30 | 中国工程物理研究院应用电子学研究所 | A kind of continuously adjustabe dual-wavelength laser output device |
| CN114498278A (en) * | 2021-12-30 | 2022-05-13 | 深圳半岛医疗有限公司 | Medical laser and laser system |
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