LD Pumped Wide Temperature Green Microchip Laser

Laser diode pumped solid state green microchip lasers enjoyed the excellentperformances which have good beam quality, small size, long lifetime, high reliabilityand so on. Due to its advantages the solid state green laser had been played animportant role in communication, medicine, military, scientific research and otherimportant aspects of the application. The state green laser working in a widetemperature band without active cool is the focus of research direction; in the paperaround the laser diode end-pumped wide temperature green microchip laser for therealization of the theoretical and experimental researches are presented.First, the development of laser diode pumped solid state laser was reviewed. Andthe present researches of solid state green lasers was summarized, its characteristicsand applications were introduced. Second, the basic theoretical of laser diode pumpedsolid state green laser to achieve was explored, the formula of the thermal focal lengthwas derived from the analysis of heat effect, this was used to analysis the relationshipbetween focal length of Nd:YVO4and the power of laser diode. The stability of theresonant cavity was analysis through the optical transformation matrix, based on thisthe dynamics performance of the Parallel plane cavity. The impact of frequencydoubling efficiency factor was obtained by the coupled wave equations, recommendthe method of phase matching, the limit length of class II KTP frequency doublingcrystal was calculated through the walk-off effect. Insert a quarter-wave plate into thecavity to broaden the working temperature range, presented the theory of laserworking in the wide temperature range. Final，did the performs test and summarizedthe full text.Using500mW laser diode pumped green microchip laser. The green laser waspassed performs test. From0oC to45oC, the mode is TEM00, M2is less than1.2,beam divergence is less than7.5mrad, output power is stabilize at3~5mW, its minisize and high reliability also. But the yield is not excellent at present, next step wewill do our best to improve the technology to reach a high percent of pass.