CN104158078A - Double-end pump laser and working method thereof - Google Patents
Double-end pump laser and working method thereof Download PDFInfo
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- CN104158078A CN104158078A CN201310176377.8A CN201310176377A CN104158078A CN 104158078 A CN104158078 A CN 104158078A CN 201310176377 A CN201310176377 A CN 201310176377A CN 104158078 A CN104158078 A CN 104158078A
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Abstract
The invention provides a double-end pump laser. The double-end pump laser includes a laser resonant cavity and pumping sources, both ends of the laser resonant cavity are provided with a total reflection mirror and an output mirror, and a first turning mirror, a first gain medium, a selective rotating device, a second gain medium, and a second turning mirror are arranged in the laser resonant cavity along a first direction; and a first wavelength laser emitted by each pumping source along the first direction is focused on a corresponding gain medium, and is partially absorbed by the gain medium and a second wavelength laser is radiated, the second wavelength laser passes through the selective rotating device and is emitted to the other gain medium and is amplified by the other gain medium to be emitted along the first direction and output through the output mirror, and the rest of the first wavelength laser passes through the selective rotating device and is emitted to the gain medium or the other gain medium to be absorbed. Since the absorption rate of the first wavelength laser of a pump is improved, the photoconversion efficiency is improved, a heat effect is reduced, and since the second wavelength laser is fully amplified, output power and stability of outputting lasers are improved.
Description
Technical field
The present invention relates to a kind of laser, relate in particular to the both-end pumping laser of a kind of 880nm of using laser as pump light.
Background technology
Develop rapidly for all solid state laser of laser processing industry at present, these all solid state laser operation materials are mainly Nd:YVO4 crystal, because this crystal has wider absorption band near 808nm wave band, absorption efficiency is high, so be mainly as pumping source at present with 808nm semiconductor laser.There is most of pump light (being the light that pumping source sends) thereby can not fully be absorbed and change into the heat defect of (being greater than 50%) but adopt 808nm laser to carry out pumping, cause thermal effect to increase, thereby the various problems such as the 1064nm laser beam quality that causes thermal stress megacryst easy fracture, output is poor, unstable, final light conversion efficiency is low, and the Nd:YVO4 laser that has therefore limited 808nm pumping is difficult to develop to high power.
Along with the development of semiconductor laser technique, the pumping source of another kind of wavelength starts application, the 880nm semiconductor laser technology with wavelength locking function is highly stable and start to occur adopting 880nm semiconductor laser to carry out pumping Nd:YVO4 crystal as pumping source, but because of near the polarization absorption of Nd:YVO4 crystal 880nm, (s light absorption is many, p light absorption is few), cause the transformation efficiency of pump light still very low, the power of Output of laser is not high, thereby causes this laser well not promoted.
Visible, current pump laser, particularly carries out in the laser of pumping with 880nm laser, insufficiently causes thermal effect impact to increase thereby exist pump light polarization absorption to make to absorb, and the problem such as pump light transformation efficiency is low.
Summary of the invention
The object of the present invention is to provide a kind of pump laser that can improve pump light absorptivity and conversion ratio, thereby reduce thermal effect and improve power and the stability of Output of laser.
Absorb the insufficient and low technical problem of transformation efficiency in order to solve pump light in prior art, the invention provides a kind of both-end pumping laser, comprise laserresonator and pumping source, described laserresonator two ends arrange respectively total reflective mirror and outgoing mirror, in described laserresonator, set gradually the first turning mirror, the first gain media, select whirligig, the second gain media, the second turning mirror along first direction; Inject the light of the first turning mirror along first direction and after second direction penetrates, vertically inject described total reflective mirror through reflection, the light of injecting the second turning mirror along first direction penetrates and exports through described outgoing mirror along third direction through reflection;
In the outside of described the first turning mirror and described the second turning mirror, a described pumping source is respectively set, the first wavelength laser of each described pumping source transmitting is injected and is focused on a corresponding described gain media along first direction, partially absorbed and give off second wave length laser by this gain media, described second wave length laser is injected into described in another gain media and is penetrated along first direction by its amplification after described selection whirligig, described first wavelength laser of remainder after described selection whirligig, be injected into this one or the other described on gain media and be absorbed.
Preferably, described selection whirligig is by the polarization direction 90-degree rotation of described second wave length laser the polarization direction that keeps described the first wavelength laser, and described the first gain media is vertical with the C axle of described the second gain media.
Preferably, described selection whirligig is the half-wave plate that is arranged on the corresponding second wave length on described first direction.
Preferably, described selection whirligig comprises: be arranged on two the 3rd turning mirrors and a focus lamp on described first direction, and two the 4th turning mirrors that arrange in the fourth direction of described laserresonator and the half-wave plate of a corresponding second wave length; Wherein, described focus lamp is arranged between two the 3rd turning mirrors, and the half-wave plate of described corresponding second wave length is arranged between two the 4th turning mirrors;
Described first wavelength laser of remainder is injected described described in another on gain media through corresponding with it described the 3rd transmission for turning mirror and the focusing of described focus lamp along first direction;
Described second wave length laser is successively through half-wave plate 90-degree rotation polarization direction, another the 4th turning mirror reflection and the reflection of another the 3rd turning mirror of the reflection of described three turning mirror corresponding with it, the 4th turning mirror reflection, corresponding second wave length, injects described gain media described in another along first direction.
Preferably, described selection whirligig is by the polarization direction 90-degree rotation of described the first wavelength laser the polarization direction that keeps described second wave length laser, and described the first gain media is parallel with the C axle of described the second gain media.
Preferably, described selection whirligig is the half-wave plate that is arranged on correspondence the first wavelength on described first direction, and the half-wave plate of this correspondence the first wavelength full-wave plate that is corresponding second wave length.
Preferably, described selection whirligig comprises: two the 5th turning mirrors in a first direction, quarter wave plate and two plano-concave total reflective mirrors of two correspondence the first wavelength are set, and two the 6th turning mirrors that arrange in the 5th direction of described laserresonator;
Wherein, the adjacent setting of two plano-concave total reflective mirror planes, and described two plano-concave total reflective mirrors are arranged between the quarter wave plate of two correspondence the first wavelength, and the quarter wave plate of described two correspondence the first wavelength is arranged between described two the 5th turning mirrors;
The transmission again that described first wavelength laser of remainder rotates 45 degree polarization directions and this 5th turning mirror again through the quarter wave plate of the quarter wave plate rotation 45 degree polarization directions of the transmission of the 5th turning mirror corresponding with it, corresponding first wavelength, plano-concave total reflective mirror direction, this corresponding the first wavelength successively, injects a described described gain media along first direction;
Described second wave length laser passes through the reflection of five turning mirror corresponding with it, the reflection of the 6th turning mirror successively, the reflection of the reflection of another the 6th turning mirror and another the 5th turning mirror, injects described gain media described in another along first direction.
Preferably, described the first wavelength is 880nm, and described second wave length is 1064nm, and described the first gain media and described the second gain media are Nd:YVO4 crystal.
Preferably, described pumping source is the semiconductor laser of output wavelength 880nm.
The method of work that a kind of both-end pumping laser is also provided that the present invention is corresponding, said method comprising the steps of:
Each described pumping source is launched described the first wavelength laser corresponding focusing on a described gain media;
This described gain media is to focusing on described the first wavelength laser part thereon and absorb and give off described second wave length laser;
Described first wavelength laser of remainder and described second wave length laser are through described selection whirligig, after this selection whirligig, described first wavelength laser of remainder and the polarization direction of second wave length laser are all parallel with the C direction of principal axis of gain media described in another;
Described first wavelength laser of remainder through described described in one or the other gain media be absorbed, second wave length laser is exaggerated through gain media described in another;
Described second wave length laser after amplification shakes in described laserresonator, through described outgoing mirror output.
Both-end pumping laser provided by the invention is selected whirligig and is provided with the gain media arranging according to correspondence direction in its both sides owing to being provided with, in the situation that gain media absorbs the first wavelength laser emission and goes out second wave length laser, corresponding selection whirligig can be corresponding rotation second wave length laser or the polarization direction of residue the first wavelength laser, make the laser parallel of the first and second wavelength or the polarization direction perpendicular to corresponding gain media, thereby corresponding the first laser that makes remainder fully absorbs, second wave length laser fully amplifies.Because the absorptivity of the first wavelength laser of pumping improves, phototranstormation efficiency is improved, and has reduced thermal effect, and because the second wave length laser of output fully amplifies, thereby improve the stability of power output and Output of laser.
Brief description of the drawings
In order to be illustrated more clearly in technical scheme of the present invention, to the accompanying drawing of required use in execution mode be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the both-end pumping laser principle schematic that the embodiment of the present invention one provides;
Fig. 2 is the both-end pumping laser principle schematic that the embodiment of the present invention two provides;
Fig. 3 is the both-end pumping laser principle schematic that the embodiment of the present invention three provides;
Fig. 4 is the both-end pumping laser principle schematic that the embodiment of the present invention four provides.
Embodiment
Below in conjunction with the accompanying drawing in embodiment of the present invention, the technical scheme in embodiment of the present invention is clearly and completely described.
The invention provides a kind of both-end pumping laser, adopt pumping source pumping to go out the first wavelength laser, according to the physical characteristic of gain media, gain media absorption portion the first wavelength laser also gives off second wave length laser.In following preferred embodiment, pumping source is the semiconductor laser that pumping goes out 880nm, and gain media adopts Nd:YVO4 crystal, and the first wavelength optical maser wavelength is 880nm, and second wave length optical maser wavelength is 1064nm.According to the polarization characteristic of Nd:YVO4 crystal, the axial laser of the axial 880nm laser of parallel its C of its main absorbing polarization direction its C vertical with partial polarization direction; Mainly the polarization direction axial 1064nm laser of parallel its C is amplified.
It should be noted that, laser device of the present invention goes for pumping source and the corresponding other gain media of other wavelength of pumping equally, as long as the laser that this pumping source pumping goes out can absorb in a large number for gain media, and the laser giving off can meet the requirement of Output of laser.The present invention adopts and selects whirligig the laser of different wave length to be carried out to the rotation of polarization direction, and coordinates the direction of gain media, optionally absorbs the laser of certain wavelength and amplifies the laser of another wavelength.Selection whirligig in each embodiment and gain media setting party be to having nothing in common with each other below, but be not limited in following severally, as long as can complete, the selectivity of corresponding wavelength absorbed and the selectivity of another wavelength laser is amplified.
embodiment mono-
Refer to Fig. 1, the embodiment of the present invention one provides a kind of both-end pumping laser, comprise the laserresonator being formed by total reflective mirror 1 and outgoing mirror 10, total reflective mirror 1 and outgoing mirror 10 are separately positioned on the two ends of laserresonator, the implication at two ends refers to the scope of laser concussion in resonant cavity, is not that restriction resonant cavity must be according to straight line setting.As shown in Figure 1, resonant cavity outside is also provided with two pumping sources 3 and 11, it should be noted that, these two pumping sources also can be arranged in resonant cavity, and this is the improvement that can carry out according to the concrete needs that arrange of laser.
As shown in Figure 1, in described laserresonator, set gradually half-wave plate 91, Nd:YVO4 crystal 8, the second turning mirror 62 of the first turning mirror 61, Nd:YVO4 crystal 7,1064nm along first direction, the half-wave plate 91 of 1064nm is the selection whirligig in the present embodiment, for the polarization direction of 90 degree rotation 1064nm laser, the polarization direction of 880nm laser is not changed.First direction in the present embodiment is the left and right directions of paper, but and no longer distinguish left still direction to the right, concrete, the laser that pumping source 3 sends is injected crystal 7 left along first direction, the laser that pumping source 11 sends is injected crystal 8 to the right along first direction.In other embodiments, first direction can be also other directions that arrange as the case may be.The vertical setting of C axle of Nd:YVO4 crystal 7 and Nd:YVO4 crystal 8, specifically in the present embodiment, the C axle of Nd:YVO4 crystal 7 is vertically placed, the C axle horizontal positioned of Nd:YVO4 crystal 8.It should be noted that, C axle is defined as according to the definition for the optical axis of crystal in Material Physics, and C axle is often referred to the direction of crystal growth, and corresponding in addition also have A axle and B axle, in the present embodiment, Nd:YVO4 crystal 7 and Nd:YVO4 crystal 8 are the crystal (a-cut) of A to cutting.
On the right side of the first turning mirror 61 and the left side of the second turning mirror 62, pumping source 3 and 8 is set respectively, this is the both-end pumping in both-end pumping laser of the present invention just also.Visible, " both-end " here and resonant cavity " two ends " and be diverse implication, the two ends of resonant cavity are the scopes for limiting resonant cavity, with optics in chamber not point-blank.Pumping source is all positioned at the outside of corresponding turning mirror, herein corresponding inner side between two turning mirrors, outside.The 880nm laser of each described pumping source transmitting is injected and is focused on a corresponding described gain media along first direction, the coupling focusing arrangement of the ejaculation Laser Focusing that makes pumping source can also be set in laser, particularly, coupling focusing arrangement comprises collimating mirror and focus lamp, pumping source 3 is launched 880nm laser through being arranged on the focusing of collimating mirror 41 and focus lamp 51 of first direction, the transmission of the first turning mirror 61, focuses on Nd:YVO4 crystal 7; Pumping source 11 is launched 880nm laser through being arranged on the focusing of collimating mirror 42 and focus lamp 52 of first direction, and the transmission of the first turning mirror 62, focuses on Nd:YVO4 crystal 8.The setting of collimating mirror and focus lamp is the 880nm laser in order to ensure to send from pumping source can be strict focuses on and be injected into corresponding crystal along first direction.Turning mirror all plates 880nm anti-reflection film and 1064nm high-reflecting film, with transmission 880nm and reflection 1064nm laser.
High absorption efficiency, polarization absorption and radiation characteristic according to Nd:YVO4 crystal near 880nm wave band, Nd:YVO4 crystal 7 and 8 partially absorbs 880nm and gives off 1064nm laser.This 1064nm laser after the half-wave plate 91 of 1064nm, be injected into another Nd:YVO4 crystal and amplified by it after penetrated along first direction, the 880nm laser of remainder is injected on original or another Nd:YVO4 crystal 7 and is absorbed after the half-wave plate 91 of 1064nm.
Particularly, in the present embodiment, the C axle of crystal 7 is vertically placed, the main 880nm laser that absorbs vertical polarization (s polarization), give off 1064nm laser, because the stimulated emission cross section of the vertical polarization of Nd3+ ion (s polarization) is much larger than the stimulated emission cross section of horizontal polarization (p polarization), so what give off is mainly the 1064nm laser of the vertical polarization (s polarization) parallel with 7 C axle.The 880nm laser that pumping source 3 is exported is after collimating mirror 4 and focus lamp 5 collimation focusings, focus on crystal 7, the vertical polarised light of 880nm laser and part of horizontal polarised light are absorbed and mainly give off the 1064nm laser of vertical polarization, the 1064nm laser of this vertical polarization is after the half-wave plate 91 of 1064nm, polarization direction 90-degree rotation, become horizontal polarization light, this 1064nm horizontal polarization light is injected crystal 8, this horizontal polarization light is with respect to crystal 8, parallel with its C axle, so this 1064nm laser is amplified when through crystal 8, 1064nm laser after amplification passes through outgoing mirror 10 output lasers through the reflection of the second turning mirror 62 along third direction.The horizontal polarization light of the 880nm remainder after crystal 7 does not change polarization direction through half-wave plate 91, and the horizontal polarization light of 880nm remainder and the C axle of crystal 8 are parallel so, during through crystal 8, will be absorbed and give off 1064nm laser.
Same, crystal 8 absorbs 880nm horizontal polarization light and vertically polarised light of part, give off the 1064nm horizontal polarization light parallel with its C axle, after the half-wave plate 91 of 1064nm, become the vertical polarised light of 1064nm, the vertical polarised light of this 1064nm is injected crystal 7, this vertical polarised light is parallel with the C axle of crystal 7, so be amplified during through crystal 7, 1064nm laser after amplification is injected total reflective mirror 1 through the reflection of the first turning mirror 61 along second direction and is penetrated back through total reflective mirror reflection direction, again inject crystal 7 through the reflection of the first turning mirror 61 along first direction, again amplified, then become parallel with the C axle of crystal 8 through the direction of rotatory polarization again of half-wave plate 91, again be exaggerated through crystal 8, then pass through outgoing mirror 10 output lasers through the turnover of the second turning mirror 62 along third direction.The vertical polarised light of the 880nm remainder after crystal 8 does not change polarization direction through half-wave plate 91, and the vertical polarised light of 880nm remainder and the C axle of crystal 7 are parallel so, during through crystal 7, will be absorbed and give off 1064nm laser.
As shown in Figure 1, between total reflective mirror 1 and the first turning mirror 61, Q-switch 2 can be set, thereby can modulate laser, make laser can export light modulated.
It should be noted that, in the present embodiment, as shown in figure mono-, second direction is parallel with third direction and all vertical with first direction, and the first turning mirror 61 and the second turning mirror 62 are 45 degree chamber refracting telescopes, and between first direction, are 45 degree.In fact, in other embodiments, it is parallel that second direction and third direction not necessarily need, and also not necessarily vertical with first direction, the angle of the first turning mirror 61 and the second turning mirror 62 can be other angles, and the angle of two turning mirrors also can be different.As long as that is: meet the requirement of light path, angle, reflection and the exit direction of turning mirror setting all can be adjusted.For example, the incidence angle of the first turning mirror can be adjusted into 60 degree, corresponding first direction changes, adjust so the position of total reflective mirror 1, still vertical with first direction after change, light path principle as shown in Figure 1 is still set up, and can realize so equally 880nm and fully absorb, the effect that 1064nm fully amplifies.
In addition, 1064nm half-wave plate 91 can also be replaced by two 1064nm1/4 wave plates.Crystal 7C axle can be arranged to horizontal positioned, and crystal 8C axle is vertically placed, as long as the two C axle vertically.
Result shows, in chamber, add 1064nm half-wave plate 91, after Nd:YVO4 crystal 7 90 degree vertical with 8 are placed, the absorption efficiency of 880nm laser reaches 97%, and the absorption efficiency of 880nm laser is less than 85% while thering is no vertical placement or while only having a Nd:YVO4 crystal, and output 1064nm laser is very unstable; The light light conversion efficiency of 880nm laser is brought up to more than 62%, and the 1064nm laser stability of output is in 2%, suitable with the stability of 808nm laser pumping now, also there will not be the phenomenon of exporting two hot spots.
embodiment bis-
The selection whirligig of the present embodiment is different from embodiment mono-, and other part compositions are identical with embodiment mono-with light path setting, and crystal 7C axle is vertically placed, crystal 8C axle horizontal positioned.
As shown in Figure 2, described selection whirligig comprises: be arranged on two the 3rd turning mirrors 63 on described first direction and 64 and a focus lamp 12, two the 4th turning mirrors 65 that arrange in the fourth direction of described laserresonator and 66 and a 1064nm half-wave plate 92; Focus lamp 12 is arranged between two the 3rd turning mirrors 63 and 64, and 1064nm half-wave plate 92 is arranged between two the 4th turning mirrors 65 and 66.In the present embodiment, two the 3rd turning mirrors 63 and 64 and two the 4th turning mirrors 65 and 66 between be 45 degree chamber refracting telescopes, be all coated with 880nm anti-reflection film and 1064nm high-reflecting film, with optionally transmission 880nm laser and reflection 1064nm laser.In the present embodiment, fourth direction is parallel to first direction, and according to the difference of each the 3rd turning mirror angle, in the corresponding situation about changing of light path, fourth direction also can change direction, instead of must be parallel with first direction.
As shown in Figure 2, the 880nm that pumping source 3 sends focuses on crystal 7, crystal 7C axle is vertically placed, crystal 7 absorbs vertical polarised light and the horizontal polarization light of 880nm and mainly gives off the vertical polarised light of 1064nm, and remainder 880nm horizontal polarization light is injected crystal 8 through the transmission of the 3rd turning mirror 63 and the focusing of focus lamp 12 along first direction.Due to crystal 8C axle horizontal positioned, C direction of principal axis and 880nm horizontal polarization parallel light, therefore this remainder 880nm horizontal polarization light is absorbed by crystal 8.
The vertical polarised light of 1064nm that crystal 7 gives off successively through reflection, the 4th turning mirror 65 of the 3rd turning mirror 63 reflect, 1064nm half-wave plate 92 90-degree rotation polarization directions become 1064nm horizontal polarization light, reflect through the 4th turning mirror 66 again and the 3rd turning mirror 64 reflects, inject crystal 8 along first direction.Due to crystal 8C axle horizontal positioned, C direction of principal axis and 1064nm horizontal polarization parallel light, therefore this 1064nm horizontal polarization light is amplified by crystal 8.1064nm horizontal polarization light after amplification after the second turning mirror 62 reflection along third direction through outgoing mirror 10 output lasers.
Same, the 880nm laser that pumping source 11 focuses on crystal 8 is absorbed horizontal polarization light and vertically polarised light of part, mainly give off 1064nm horizontal polarization light, the vertical polarised light line focus of the 880nm mirror 12 of remainder focuses on crystal 7 again, because polarization direction is identical with the C direction of principal axis of crystal 7, absorbed by crystal 7.And the 1064nm horizontal polarization light giving off through reflection, the 4th turning mirror 66 of the 3rd turning mirror 64 reflect, 1064nm half-wave plate 92 90-degree rotation polarization directions become the vertical polarised light of 1064nm, reflect through the 4th turning mirror 65 again and the 3rd turning mirror 63 reflects, inject crystal 7 along first direction.Because crystal 8C axle is vertically placed, C direction of principal axis and 1064nm horizontal polarization parallel light, therefore the vertical polarised light of this 1064nm is amplified by crystal 8.After amplifying, light path and embodiment mono-are similar, through the reflection of the first turning mirror 61, total reflective mirror 1, the second turning mirror in resonant cavity, export through outgoing mirror 10, do not repeat them here.
Visible, the present embodiment can fully absorb 880nm laser, improves its transfer ratio, and can fully amplify 1064nm laser, improves laser output stability.Can obtain the effect identical with embodiment mono-.In addition, the present embodiment adopts focus lamp to realize focusing on again of 880nm laser, has improved absorptivity.
embodiment tri-
The 1064nm half-wave plate in embodiment mono-is replaced with 880nm half-wave plate by the present embodiment, and be 1064nm full-wave plate; The C direction of principal axis of crystal 7 and crystal 8 is arranged to parallel placement, for example, all vertically places.Remaining part and light path setting are identical with embodiment mono-.
As shown in Figure 3; the 880nm Laser Focusing that pumping source 3 is exported is to crystal 7; the vertical polarised light of 880nm and part of horizontal polarised light are by 7 absorptions and mainly give off the vertical polarised light of 1064nm; the 880nm horizontal polarization light of remainder, after 880nm half-wave plate 93 90-degree rotations, is absorbed by crystal 8 because direction is parallel with crystal 8C axle; The vertical polarised light of 1064nm is constant through 880nm half-wave plate 93 directions, is amplified by crystal 8 because direction is parallel with crystal 8C axle.
Equally, the 880nm Laser Focusing that pumping source 11 is exported is to crystal 7, the vertical polarised light of 880nm and part of horizontal polarised light are absorbed by crystal 8 and mainly give off the vertical polarised light of 1064nm, and the 880nm horizontal polarization light of remainder is absorbed by crystal 7 after 880nm half-wave plate 93 90-degree rotations; The vertical polarised light of 1064nm to constant, is injected crystal 8 by its amplification through 880nm half-wave plate 93 rears.Remaining laser optical path and output principle are identical with embodiment mono-, do not repeat them here.
In addition, 880nm half-wave plate 93 can also be replaced by two 880nm1/4 wave plates, and this 880nm1/4 wave plate is 1064nm half-wave plate.The C axle of crystal 7 and crystal 8 also can all be set to horizontal positioned, as long as the two C axle is parallel.
Visible, the present embodiment can fully absorb 880nm laser, improves its transfer ratio, and can fully amplify 1064nm laser, improves laser output stability.Can obtain the effect identical with embodiment mono-.
embodiment tetra-
The present embodiment and embodiment tri-principles are similar, have just adopted another kind of selection whirligig to replace the 880nm half-wave plate 93 shown in Fig. 3, same realization the 90-degree rotation of 880nm laser polarization direction and the polarization direction that maintains 1064nm laser.
As shown in Figure 4, select whirligig to comprise: the quarter wave plate 94 and 95 and two plano-concave total reflective mirrors 131 and 132 that two the 5th turning mirrors 67 and 68 in a first direction, two 880nm are set; Two the 6th turning mirrors 69 and 60 that arrange in the 5th direction of laserresonator.In the present embodiment, two the 5th turning mirrors 67 and 68 and two the 6th turning mirrors 69 and 60 be 45 degree chamber refracting telescopes, be coated with 880nm anti-reflection film and 1064nm high-reflecting film, with optionally transmission 880nm laser and reflection 1064nm laser.In the present embodiment, the 5th direction is parallel to first direction, and according to the 5th and the difference of the 6th turning mirror angle, in the corresponding situation about changing of light path, the 5th direction also can change direction, instead of must be parallel with first direction.
The adjacent setting of two plano-concave total reflective mirror 131 and 132 planes, and between the quarter wave plate 94 and 95 of two 880nm, the quarter wave plate 94 and 95 of 880nm is arranged between described two the 5th turning mirrors 67 and 68.
As shown in Figure 4, the 880nm Laser Focusing that pumping source 3 is exported is to crystal 7, the vertical polarised light of 880nm and part of horizontal polarised light are by 7 absorptions and mainly give off the vertical polarised light of 1064nm, the 880nm horizontal polarization light transmission of the 5th turning mirror 67 successively of remainder, the quarter wave plate 94 of 880nm rotates 45 degree polarization directions, plano-concave total reflective mirror 131 directions, the quarter wave plate 94 of 880nm rotates 45 degree polarization directions again becomes vertical polarised light, through the transmission again of the 5th turning mirror 67, inject crystal 7 along first direction, because polarization direction is identical with crystal 7C axle, therefore the vertical polarised light of this 88nm is absorbed.Pumping source 11 focuses on the same light light conversion of carrying out of 880nm laser on crystal 8, and final 88nm laser is absorbed by crystal 8.
Crystal 7 gives off the vertical polarised light of 1064nm successively through the reflection of the 5th turning mirror 67, the reflection of the 6th turning mirror 69, the reflection of the reflection of the 6th turning mirror 60 and the 5th turning mirror 68, inject crystal 8 along first direction, because the vertical direction of polarized light of 1064nm does not change, parallel with the C direction of principal axis of crystal 8, amplify through crystal 8.Same, crystal 8 gives off the vertical polarised light of 1064nm and finally amplifies through crystal 7.
1064nm after crystal 7 amplifies, through the reflection of the first turning mirror 61, total reflective mirror 1, the second turning mirror 62, exports through outgoing mirror 10.1064nm after crystal 8 amplifies, through the reflection of the second turning mirror 62, exports through outgoing mirror 10.
Visible, the present embodiment can fully absorb 880nm laser, improves its transfer ratio, and can fully amplify 1064nm laser, improves laser output stability.Can obtain the effect identical with embodiment mono-.In addition, the present embodiment adopts plano-concave total reflective mirror to realize 880nm and focuses on, has improved absorptivity.
embodiment five
The present embodiment discloses the method for work of corresponding above-mentioned both-end pumping laser, said method comprising the steps of: 1) pumping source 3 and 11 transmitting 880nm laser corresponding focusing on crystal 7 and crystal 8; 2) crystal 7 and crystal 8 absorb and give off 1064nm laser focusing on 880nm laser part respectively; 3) remainder 880nm laser and 1064nm laser are through selecting whirligig, and after this selection whirligig, the polarization direction of remainder 880nm laser and 1064nm laser is all parallel with corresponding another crystal C direction of principal axis; 4) through selecting after whirligig, the 880nm laser of remainder is absorbed by crystal 7 or crystal 8, and 1064nm laser is exaggerated through another corresponding crystal; 5) the 1064nm laser after amplification shakes in laserresonator, exports through outgoing mirror.
Visible, by the method for work of the present embodiment, can make the 880nm pump light of laser fully absorb, the 1064nm laser giving off fully amplifies, thereby can effectively reduce thermal effect, improves light absorption transfer ratio, improves the stability of Output of laser.
In sum, each embodiment is provided with and selects whirligig and corresponding gain media above, in the situation that gain media absorbs the first wavelength laser emission and goes out second wave length laser, corresponding selection whirligig can be corresponding rotation second wave length laser or the polarization direction of residue the first wavelength laser, make the laser parallel of the first and second wavelength or the polarization direction perpendicular to corresponding gain media, thereby corresponding the first laser that makes remainder fully absorbs, second wave length laser fully amplifies.Because the absorptivity of the first wavelength laser of pumping improves, phototranstormation efficiency is improved, and has reduced thermal effect, and because the second wave length laser of output fully amplifies, thereby improve the stability of power output and Output of laser.
It should be noted that, the pump light adopting in above embodiment is 880nm, but laser of the present invention and method of work thereof are not limited to the laser of this wavelength, can be the pump light wavelength in certain limit, for example, between 870nm-890nm.In addition; if other pump light and ejaculation light wavelength need to optionally absorb and amplify the laser of corresponding wavelength; all can use laser of the present invention and method of work; in addition; what the above each embodiment of the present invention penetrated is 1064nm laser, relates to the secondary that frequency multiplication produces thus, three double-frequency lasers all within protection scope of the present invention.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace or improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a both-end pumping laser, comprise laserresonator and pumping source, described laserresonator two ends arrange respectively total reflective mirror and outgoing mirror, it is characterized in that: in described laserresonator, set gradually the first turning mirror, the first gain media, select whirligig, the second gain media, the second turning mirror along first direction; Inject the light of the first turning mirror along first direction and after second direction penetrates, vertically inject described total reflective mirror through reflection, the light of injecting the second turning mirror along first direction penetrates and exports through described outgoing mirror along third direction through reflection.
In the outside of described the first turning mirror and described the second turning mirror, a described pumping source is respectively set, the first wavelength laser of each described pumping source transmitting is injected and is focused on a corresponding described gain media along first direction, partially absorbed and give off second wave length laser by this gain media, described second wave length laser is injected into described in another gain media and is penetrated along first direction by its amplification after described selection whirligig, described first wavelength laser of remainder after described selection whirligig, be injected into this one or the other described on gain media and be absorbed.
2. both-end pumping laser according to claim 1, it is characterized in that, described selection whirligig is by the polarization direction 90-degree rotation of described second wave length laser the polarization direction that keeps described the first wavelength laser, and described the first gain media is vertical with the C axle of described the second gain media.
3. both-end pumping laser according to claim 2, is characterized in that, described selection whirligig is the half-wave plate that is arranged on the corresponding second wave length on described first direction.
4. both-end pumping laser according to claim 2, it is characterized in that, described selection whirligig comprises: be arranged on two the 3rd turning mirrors and a focus lamp on described first direction, and two the 4th turning mirrors that arrange in the fourth direction of described laserresonator and the half-wave plate of a corresponding second wave length; Wherein, described focus lamp is arranged between two the 3rd turning mirrors, and the half-wave plate of described corresponding second wave length is arranged between two the 4th turning mirrors;
Described first wavelength laser of remainder is injected described described in another on gain media through corresponding with it described the 3rd transmission for turning mirror and the focusing of described focus lamp along first direction;
Described second wave length laser is successively through half-wave plate 90-degree rotation polarization direction, another the 4th turning mirror reflection and the reflection of another the 3rd turning mirror of the reflection of described three turning mirror corresponding with it, the 4th turning mirror reflection, corresponding second wave length, injects described gain media described in another along first direction.
5. both-end pumping laser according to claim 1, it is characterized in that, described selection whirligig is by the polarization direction 90-degree rotation of described the first wavelength laser the polarization direction that keeps described second wave length laser, and described the first gain media is parallel with the C axle of described the second gain media.
6. both-end pumping laser according to claim 5, is characterized in that, described selection whirligig is the half-wave plate that is arranged on correspondence the first wavelength on described first direction, and the half-wave plate of this correspondence the first wavelength full-wave plate that is corresponding second wave length.
7. both-end pumping laser according to claim 5, it is characterized in that, described selection whirligig comprises: two the 5th turning mirrors in a first direction, quarter wave plate and two plano-concave total reflective mirrors of two correspondence the first wavelength are set, and two the 6th turning mirrors that arrange in the 5th direction of described laserresonator;
Wherein, the adjacent setting of two plano-concave total reflective mirror planes, and described two plano-concave total reflective mirrors are arranged between the quarter wave plate of two correspondence the first wavelength, and the quarter wave plate of described two correspondence the first wavelength is arranged between described two the 5th turning mirrors;
The transmission again that described first wavelength laser of remainder rotates 45 degree polarization directions and this 5th turning mirror again through the quarter wave plate of the quarter wave plate rotation 45 degree polarization directions of the transmission of the 5th turning mirror corresponding with it, corresponding first wavelength, plano-concave total reflective mirror direction, this corresponding the first wavelength successively, injects a described described gain media along first direction;
Described second wave length laser passes through the reflection of five turning mirror corresponding with it, the reflection of the 6th turning mirror successively, the reflection of the reflection of another the 6th turning mirror and another the 5th turning mirror, injects described gain media described in another along first direction.
8. according to the both-end pumping laser described in claim 1-7 any one, it is characterized in that, described the first wavelength is 880nm, and described second wave length is 1064nm, and described the first gain media and described the second gain media are Nd:YVO4 crystal.
9. both-end pumping laser according to claim 8, is characterized in that, described pumping source is the semiconductor laser of output wavelength 880nm.
10. a method of work for both-end pumping laser according to claim 1, is characterized in that, said method comprising the steps of:
Each described pumping source is launched described the first wavelength laser corresponding focusing on a described gain media;
This described gain media is to focusing on described the first wavelength laser part thereon and absorb and give off described second wave length laser;
Described first wavelength laser of remainder and described second wave length laser are through described selection whirligig, after this selection whirligig, described first wavelength laser of remainder and the polarization direction of second wave length laser are all parallel with the C direction of principal axis of gain media described in another;
Described first wavelength laser of remainder through described described in one or the other gain media be absorbed, second wave length laser is exaggerated through gain media described in another;
Described second wave length laser after amplification shakes in described laserresonator, through described outgoing mirror output.
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| CN108933378A (en) * | 2018-09-21 | 2018-12-04 | 深圳市杰普特光电股份有限公司 | Bicrystal ultraviolet laser |
| CN108963741A (en) * | 2018-09-21 | 2018-12-07 | 深圳市杰普特光电股份有限公司 | Bicrystal green (light) laser |
| CN108988114A (en) * | 2018-07-19 | 2018-12-11 | 中国科学院上海光学精密机械研究所 | The compensation method of high power laser light thermal lensing effect |
| CN109119875A (en) * | 2018-09-21 | 2019-01-01 | 深圳市杰普特光电股份有限公司 | Bicrystal infrared laser |
| CN114825010A (en) * | 2022-04-18 | 2022-07-29 | 中国科学院理化技术研究所 | Double-end pumping laser device |
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