Theoretical and experimental study of high efficiency frequency tripling using large-aperture laser beam
QIU ZHIREN, CAI XIJIE, LANG JIJUN, HUANG KUIXI, GE XIAPING, LI GEPING AND LIN KANGCHUN Shanghai Institute of Optics and Fine Mechanics, Academia Sinica) (Received 21 November 1988; revised 8 May 1990) Student of the Changchun Institute of Optics & Fine Mechanics.
On the base of three-wave interaction equations, the dependences of the maximum attainable tripling efficiency on the energy ratio of the fundamental wave to the second harmonic wave, crystal length, power density, input beam divergence and match-type are given. The experimental results of frequency tripling are in agreement with theoretical calculations. With type-II KDP used in tripling, energy conversion efficiency as high as 43% has been obtained for moderate power levels.