【摘要】 <正> 0 Introduction Stimulated Raman conversion in metal vapour was found to be an effident process for shifting UV radiation to the visible and infrared。The field of study has been extented from alkali to alkaline-earth metal. We have investigated the nonlinear optical effects in carium and barium vapour excited by single and two-photons, Here presents the results of frequency, conversion observed in barium.更多还原