The Research On High-Power CW Green Laser

Red, green and Blue CW lasers, produced by diode-pumped solid-state laser materials, are the light source of all-solid-state laser television. TV signal controls three-color lasers scanning images. Along with the enhancement of semiconductor laser used for pumping laser crystal as well as the frequency-doubled crystal in nonlinear optics material reaching maturity, all-solid-state green light laser develops extremely rapidly. It is necessary to enhance in the green laser, one of light source, in order to increase the laser television's display brightness. This dissertation focuses on theoretical and experimental research of high-power all-solid-state 0.532μm CW green laser. The main content and key innovative points of this dissertation are as follows:1. The laser television principle, all-solid-state laser development, characteristics and side-pumped semiconductor technology are summarized, as well as the development of all-solid-state green laser studied in this dissertation.2. Considering the thermal effect of Nd:YAG, after inferential reasoning and computation we get the relationship between Nd:YAG rod's thermal focal length(f) and LD pump power(Pin) as well as the relationship between Nd:YAG rod's thermal focal length(f) and physical quantityβwhich relates with lenslike coefficient. The curve of Nd:YAG module's driven current(I) and thermal lens focal length(f) is measured in the experiment. Then the relationship between Nd:YAG module driven current(I) and between physical quantityβis obtained.3. Three-mirror folded resonator is used in the experiment. By inferring ray matrix of three-mirror folded resonator and g-diagram method, relations between the resonator stable condition and various parameters are discussed. After parameter optimization and the experiment, the scope ofβwhich relates with Nd:YAG module driven current is made to meet resonator stable condition. when the Nd:YAG module driven current is 20A, 15W CW green laser output power is obtained, with optical-optical conversion efficiency of 9.7%.