LD Pumped 457nm Solid-state Blue Laser

Laser Diode pumped solid-state laser (DPSSL) is an important branchin laser technological field which is more advantageous on the weight, volume, efficiency of the electric-optic switch than traditional laser.Continuous wave, pulse operation, Q-switching and mode-locking operationhave been achieved for DPSSL which have a lot of uses in the field ofmaterial manufacture, medicine, optical instruments, basic study and so on.Presently, the development of LD pumped 473nm, solid-state blue laseris almost mature but not 457nm, the theoretical and experimental research isvery necessary. Based on the present researches, some valuable results havebeen obtained:1. Based on monolithic consideration, the problem of mode-matchingwas analyzed.2. Introducing ABCD theory, the laser mode was analyzed. With thethermal effect consideration.3. The optical length of crystal was achieved for the characteristics ofquasi-three-level. After comparing the three types of crystal, we select LBOas the main frequency doubler. Meanwhile, some necessary analysis aboutfilm were made, the other strong spectrum were restrained by suitablecoating.4. LD-pumped Nd: YVO₄, LBO (type-Ⅰcritical phase matching)intra-cavity frequency doubled, blue laser at 457nm was obtained finally.Under the condition of 2W pump power, high power TEM₀₀ mode blue laserat 457nm of 65m W was obtained. By means of inserting diaphragm intocavity, the power fluctuation and beam mode were improved; in theexperiments, the proportion of special mode matching in quasi-three-levellaser was discovered, and the phenomenon were explained reasonably.