Output power carries laser of YVO4/LBO Chan Pin of ∶ of the Nd that take use for the sheet of 21.5W
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5When W, achieved supreme power for 21.
5Laser outputs the 532 Nm Chan Pin of W, ± of excel of stability of its 8h power 1% , m2<1 of quality of beam of light.
1, efficiency of smooth smooth transition is 31.
9% . 1, each fields that green smooth laser can use Chan Pin of high power of foreword whole solid state extensively at scientific research, smoke laser of carry titanium gem or dye laser for instance, survey the laser spectrum test with high resolution accurately. However, below the condition that obtains use in high power, the meeting in laser gain medium produces serious fuel factor, this rises further with respect to what restricted laser power and quality of beam of light. Accordingly, the heat that at present laser of high power solid state studies, advocate if be centered in character of fuel factor of research laser crystal and the fuel factor in reducing laser crystal,go up. The method that reduces laser crystal fuel factor includes to use compound gain medium, low impure crystal, double end smokes movement way to perhaps take the kind of carry directly. At present already a variety of methods can make even if the model runs,laser achieves sheet, use for example turn round resonance of modular antrum, short antrum, standard to provide choose model and birefraction filter to choose a model to wait. But in the design high power outputs lumen when times frequency laser, still be to use annular and syntonic pitch mostly, eliminate a space to burn aperture effect to undertake choosing a model. However, the component inside the speech that includes as a result of annular antrum is too much, increased the lumen loss of laser consequently, those who go against laser of high power odd frequency obtain. About the development of laser of high power odd frequency, abroad basically is a delegate with company of be concerned with, the light source of odd frequency green light that formed VerdiV series, below the case that uses central wavelengh to take carry cause for 808nm, its are highest output power is 18W; ELS company of Germany uses chip crystal, the light source of odd frequency green light that realized highest output power to be 15W. In home, institute of Shanxi university photoelectricity is engaged in the research of laser of odd frequency of whole solid state for a long time working, but the effect that suffers laser crystal fuel factor, restricted what laser outputs power to rise. The article used crystal of YVO4 of wedge Nd ∶ to improve the stability of laser as gain medium, in Chan Duan the circumstance that take use falls, use annular and syntonic antrum to chose modular technology to realize high power odd frequency output of green smooth laser. The laser diode that uses central wavelengh to be 888nm (LD) as the source that take use, reduced the fuel factor of laser crystal. Through reasonable annular resonance antrum is designed, assure to be obtained in gain medium place as far as possible bigger base modular measure and the incident angle of light of oscillation of place of lens of antrum of contractible and syntonic antrum, of the fuel factor that eased gain medium point and annular antrum resemble coming loose, enhance the output power of odd frequency laser. The power taking use that drawing is 67.
When 5W, the power of the biggest output of odd frequency green light was achieved 21.
5W, 2 ＜ of 1.
1, efficiency of smooth smooth transition is 31.
9 ％ , the ellipticity excel of facula 0.
16, 1 ％ of ± of excel of stability of power of 8h of output green light. 2, experimental design and unit plan 1 pursue for experimental device, syntonic antrum is 4 lens annular antrum, include two planar lens among them [M1: S1, decrease instead (AR) 888nm; S2, appear high (HT) 888nm, turn over high (HR) 1064nm and M2: S1, HR1064nm] with two concave mirror (M3: S1, HR1064nm and M4: S1, HR1064nm, HT532nm; S2, HT532nm. M3, m4 ＝ 100mm) . The wedge that gain medium adopts α cut is compound crystal of Nd ∶ YVO4 (S1, s2: AR888nm, 1064nm) , impure atomicity mark is 0.
8 ％ , dimension is × of 3mm × 3mm (3 ＋ 20) Mm, to the absorption that 888nm takes carry light efficiency is 89 ％ . The design of wedge crystal can remove a polarization to divide bundle implement action, in different polarization in the competition of directional mode, assure precede over of π polarized light σ polarized light rises inside antrum brace up, the line degree of polarization that raises laser and polarization directional stability. Faraday rotates implement (TGG) with half-wave plate (HWP) optical isolator of composition makes laser realizes one-way movement, obtain stable Chan Pin to output. The LBO crystal that times frequency crystal uses dimension to be 15mm of × of 3mm × 3mm (S1, s2: AR1064nm, 532nm) , accuse Wen Yi through what abstain (control precision is 0.
01 ℃ ) crystal temperature control is blame is critical and phasic match temperature 149 ℃ . The laser diode that smokes carry source to use fiber-optic coupling to output (LIMO F400 DL888 EX1458) , central wavelengh is 888nm, power of the biggest output is 90W, fiber-optic core diameter is 400 μ M, numeric aperture prominents is 0.
22. The after looking at far system plastics focusing that the laser light beam that laser diode outputs is 96 ％ via transmitting efficiency within crystal of Nd ∶ YVO4. Smoke carry photograph to compare for 808nm laser diode with central wavelengh, use central wavelengh to smoke carry to have two advantages for the laser diode of 888nm: 1) the heat that uses 888nm to smoked movement way to reduce quanta deficit to arise directly, for example, want to obtain 1064nm laser output, with 808nm the photograph that take use is compared, thermic load will from 24.
1 ％ is cut for 16.
5 ％ , such is in in the process taking use of laser, gain medium can draw more power that take use and make sure thermic load won't increase; 2) the stability that laser work also improved while the character that 888nm takes movement way to be absorbed without the polarization is reducing fuel factor. To describe the fuel factor of crystal mensurably, use LASCAD software analysed 888nm and 808nm to smoke the temperature that carries means was absorbing interior of the crystal below the same power that take use to distributing. Above all, choose impure atomicity mark for 0.
8 ％ , dimension is × of 3mm × 3mm (3 ＋ 20) the crystal of Nd ∶ YVO4 of Mm, this crystal smokes the suction of carry light to receive efficiency to be 89 ％ for 888nm to wavelengh. Next, use impure atomicity score for 0.
2 ％ , dimension is × of 3mm × 3mm (3 ＋ 20) the crystal of Nd ∶ YVO4 of Mm, when the wavelengh of the light that take use is 808nm, the absorption with smooth to taking use crystal of Nd ∶ YVO4 efficiency is 95 ％ . Graph 2 use interior of crystal of two kinds of means that take use to be in to absorbing condition of same the power that take use to fall transverse distributing with fore-and-aft temperature graph. Nextpage is seen by the graph, use 888nm to take carry kind, highest temperature is in gain medium 349.
5K (equivalence smokes movement way to be the highest temperature when 32W in the power that take use at 808nm) , take carry kind than 808nm low 72.
6K, meanwhile, the temperature of crystal interior distributings evener also. This smokes movement way to issue radial temperature to distributing with respect to the end panel that it is sheet inhomogenous offerred a kind of effective solution, simplified thereby before the experimental unit that double end panel takes use, make odd end panel smokes movement way to obtain movement of high power odd frequency to become a possibility. In the design of high power laser, hot lens is a crucial parameter, want to optimize the parameter of laser, must measure hot lens, analyse hot lens the influence of firm to laser area and mode, reduce hot lens effect to answer the influence of laser through reasonable antrum design. In be being designed here, through taking the analysis of the fuel factor when carry to 888nm, design reasonable syntonic antrum, enlarge gain medium dimension of mode of place radical model, improve the fuel factor that laser crystal is in further. In addition, to obtain Chan Pin laser is outputted, use 4 lens the design of annular and syntonic antrum, if the graph is shown 1 times, this antrum in the concave mirror that includes two sides to tilt, can introduce consequently resemble additionally coming loose. It is then in whole design, to obtain the stable Chan Pin of higher power laser is outputted, should reduce what annular and syntonic antrum brings to resemble coming loose as far as possible. In the experiment, use 30 ∶ the 1mm of expand into of lumbar spot diameter that the plastic system of 75 is in the light that take use place of laser gain medium, syntonic antrum length is 490mm, the distance between two concave mirror is 96mm, an angle of incidence that oscillation light is in in antrum lens is 10 ° , mode of model of this time base is in the facula diameter design in gain medium 0.
8mm, the light that take use and the facula dimension with smooth fundamental frequency all got enlarge, this will improve the fuel factor in laser crystal further. And of syntonic antrum resemble coming loose to cannot be eliminated completely, on the design of syntonic antrum, an angle of incidence that reduces oscillation light to be in in lens of concave side antrum as far as possible and lens of concave side antrum leave an axis incident to introduce resemble coming loose influence. 3, experimental result and analysis pass an analysis, use 888nm to draw carry and reasonable syntonic antrum design directly, and the way that annular antrum picks a standard, the power taking use that drawing finally is 67.
When 5W, smoke carry and lumen through odd end panel the means of times frequency gained output power for 21.
The laser of green light of frequency of certain order for goods of 5W. Arrive from threshold value when the power that take use 67.
When 5W increases continuously, the laser of output all can maintain quality of good beam of light, and output power increase continuously, if pursue,3 are shown. Graph 4 for laser output power is 21.
When 5W, the Po in scanning law cloth collect (FP) the Chan Pin curve that antrum gets, prove laser realizes stable Chan Pin to run. It is when output power is the greatest, measure greenly smooth laser 1 ％ of ± of excel of 8h power stability, quality of beam of light is less than 1.
1, if pursue,5 are shown. Graph the 5 facula that measure to pass analyzer of quality of beam of light distributing graph, efficiency of smooth smooth transition is 31.
9 ％ . See by experimental result, the direct way that take use mixes 888nm enlarge laser crystal dimension of facula of place radical model, reduced gain medium to take the serious fuel factor of the generation in carry process in high power greatly, the output power that enhanced laser and smooth light change efficiency. 4, the fuel factor that conclusion analysed 888nm and 808nm to take carry kind through LASCAD software, with 808nm laser diode the photograph that take use is compared, use 888nm laser diode to smoke carry to have quanta loss small, and the character that absorbs without the polarization, can reduce the fuel factor of laser crystal effectively. Adopt reasonable antrum design, enlarged gain medium the facula dimension of place radical model and those who reduced syntonic antrum resemble coming loose. Use annular antrum to choose modular method, green smooth laser outputs the high power Chan Pin that gains stability. The power taking use that drawing is 67.
When 5W, use Chan Duan to smoked movement way to gain supreme power for 21.
Green smooth laser outputs the Chan Pin of 5W, its change efficiency to achieve solely solely 31.
9 ％ , 2 ＜ of of quality of beam of light 1.
1, 1 ％ of ± of excel of 8h power stability. CNC Milling