CHARACTERIZATION OF BIAXIAL CRYSTALS FOR TANGENTIALLY PHASE-MATCHED FREQUENCY-CONVERSION

Ultraviolet radiation has been generated by tangentially phase-matched sum-frequency mixing in biaxial L-arginine phosphate (LAP) crystal fo r the first time using Nd:YAG output at 1064 nm and Rh 6G dye laser ou tput at 560 nm as the two input sources. Characterization has also bee n made of such a cheap, biaxial crystal for its possible use in device s for tangentially phase-matched short wavelength generation. If the c rystal is of proper cut, thickness and quality so that its maximum cap ability can be exploited it can replace the potassium dihydrogen phosp hate (KDP) group of crystals for various applications.