Development of tunable all solod-state UV laser

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・Simple and high-efficiency cw Ti : sapphire LBO-intracavity SHG cavity was successfully developed.・Infrared-to-UV conversion efficiency over 70% was realized. To the best of our knowledge, this is the highest SHG efficiency with cw Ti : sapphire laser ever reported.・Stable and wavelength-tunable UV radiation was obtained with the maximum power of 740 mW.Wavelength-tuning range was from 400 nm to 395 nm and is possibly extended by using different cut LBO crystals. The UV output pattern was close to circular and spatial-intensity distribution was smooth, and therefore suited for application. The issue of intracavity-SHG instability was overcome by large mode number pumping laser.・Enhancement factors of conversion efficiency were theoretically analyzed. Calculated UV powers were in good agreement with the measured ones.・In addition to LBO,BBO and CLBO crystals were utilized and compared. From the view points of conversion efficiency, output pattern and tuning characteristic, LBO crystal is realized to be most favorable for this application. However,・Laser-induced damages on LBO AR-coatings were observed as the laser operated at higher power level.