The Research On All-Solid-State High Power Green Laser Based On Composite Ceramic Material

With the merits of high efficiency, good beam quality, compactness, long longevity and low cost, laser diode pumped high repetition, high average output power, solid-state green laser has found a wide range of application in the fields of industrial processing, oceanic detection, laser isolation of uranium isotopes and scientific research. Recently, a type of newly invented gain medium-transparent ceramic material has also attracted a broad interest and shown a driving potential among the laser application areas. Compared to single crystal materials, transparent ceramic media have shorter fabrication time period, lower cost manufacture equipment, ease fabrication process, larger size, higher concentration and lower sinter temperature. In addition to these, they can be developed into multi-functional ceramic materials. The main content and innovative points in the dissertation can be summarized as follows:1. Made a detailed analysis for the gain medium of all-solid-state laser and a comparison between single crystals and transparent ceramic materials. Presented recent development of transparent ceramic materials and ceramic lasers, especially the progress of high power Nd:YAG ceramic lasers.2. Done some experimental research on the thermal effect of composite Nd:YAG ceramic material and made a helpful comparison between composite single material and composite ceramic medium. On the basis of the study on thermal effect of composite ceramic material, the high power Nd:YAG ceramic laser resonators were optimally designed. Considering the steady area and the accordingly beam radius, we used a linear plano-plano cavity. When the pumping power was 1600W, the cw laser output up to 511W at 1064nm was obtained and the optical-optical efficiency was 31.9%. To our knowledge, this is the highest value of laser output by using a newly composite Nd:YAG ceramic rod as the gain medium in our country.3. Made some experimental research on the optimal output-coupler transmission for high power Nd:YAG ceramic laser. In the experiment, with several of transmission output-coupler available T=10%, 30%, 35%, 40%, under the temperature of 21.5oC, 22.5oC and 24oC, different laser output powers were obtained. Finally, when the temperature was 22.5oC and the transmission was T=30%, the largest fundamental frequency wave was achieved. The excellent...