For reducing the self-excited oscillation of end-pumped laser, the laser properties of 1064 laser is investigated with different temperature of the LD. The energy of the LD has no obvious change in the temperature range of 17.5°C to 30°C. When the LD temperature increases from 17.5°C to 30°C the peak wavelength of LD changes from 796.1nm to 799.2nm, and the corresponding wavelength variation coefficient with temperature is 0.25nm /°C. The output energy of the 1064nm laser are investigated with the LD temperature of 22.5°C, 25°C and 30°C. The experiment results indicate that output energy of the 1064nm laser increases continuously with the LD temperature of 22.5 ℃, the output energy is 83 mJ at the pump energy of 527 mJ, corresponding to the optical conversion efficiency of 15.7%, and no saturation occurs. The output energy of the 1064nm laser is saturated when the pump energy is greater than 498 mJ with the LD temperature of 25°C, and the output energy is 77 mJ at the pump energy of 527 mJ, corresponding to the optical conversion efficiency of14.6%.The output energy of the 1064 nm laser is saturated when the pump energy is greater than 382 mJ with the LD temperature of 30°,C and the output energy is 52.1 mJ at the pump energy of 409 mJ, corresponding to the optical conversion efficiency of 12.7%. The self-excited oscillation can be effectively suppressed by reducing gain of pump, and provide an effective technical means for obtaining high-energy end-pumped Q-switched laser output.
Micro-nano project by studying the micro channel plate surface micro convex particle sizes can produce a phenomenon of point discharge which causes the field emission, and particles on the surface on the micro channel plate mechanism, then through metallographic microscope classification and testing for different particle morphology, finally three kinds of particle preparation is be determined. Through the study, by water to remove the ultrasonic repeatedly can get rid of polishing powder residue. And acid etching process of silica particles by adding alkali ultrasonic frequency and the use of high frequency ultrasound alternately can be completely removed. Then through evaporation before increasing ion bombardment can effectively control the micro convex particles which is produced after evaporation electrod. Through the study, by water to remove the ultrasonic repeatedly can get rid of polishing powder residue. And acid etching process of silica particles by adding alkali ultrasonic frequency and the use of high frequency ultrasound alternately can be completely removed. Then through evaporation before increasing ion bombardment can effectively control the micro convex particles which is produced after evaporation electrod.
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