Study Of Diode-pumped All-solid-state Deep Ultraviolet Laser At 213nm

Diode-pumped all-solid-state lasers (DPSSL) have become a central of focus inthe field of lasers due to their many advantages, such as high efficiency, highstability, good quality of light beam, compactness, long lifetime and etc.All-solid-state deep ultraviolet lasers are widely used in the field of precise materialsmaking, optical chisel, optical printing, spectroscopic analysis, microelectronics,medical treatment and scientific research in general. This dissertation presentsresults of theoretical and experimental researches on lasers based on all-solid-state213nm deep ultraviolet laser. The contents can be outlined as follows:1. The advantages and applies of diode-pumped solid-state ultraviolet lasers areintroduced. The main approaches and new results of all-solid-state ultravioletlasers with diode-pumped at present are summarized.2. Introducing the theory of nonlinear frequency doubling, sum-frequency and thephase-matching technology. Analyzing the characters of every kind of nonlinearcrystal, their advantages and shortness are presented.3. The Q-switched technology and principle of acoustic-optical Q-switched aresummarized. Analyzing the characters of some kind of laser crystals, theiradvantages and shortness are presented. The best work way of 1064nm laser isinvestigated by theory analyzing and need of our experiments.4. The continuous waves of 532nm is obtained by inter-cavity frequency doublingand extra-cavity frequency doubling separately. Based on the analysis of theory,the ultraviolet output at 266nm is achieved by using KTP/BBO crystal. Whenthe incident pumping power was 10.3W, we obtained 59mW 266nm ultravioletoutput and Green-UV energy conversion as great as 9% at 20 kHz repetition ratewith pulse duration of 8ns and peak power of 370W.5. Generation of a fifth harmonic is investigated theoretically. With the help ofanalytical numerical investigations the optimized conditions for maximumconversion into the fifth harmonic are found. Then, we obtained deep ultravioletoutput at 213nm.