We at present, can use a few nonlinear crystals such as LiB3O5; (LBO), CsLi
B6O10 (CLBO), KBe2BO3F2 (KBBF) in deep ultraviolet (DUV) below 200 nm. Sinc
e the properties of these crystals have not been theoretically investigated
in deep ultraviolet, we have performed the calculations of the frequency d
oubling, sum frequency phase matching and effective nonlinear coefficients
of LBO, CLBO and KBBF crystals in DUV waveband. We have also investigated t
he possibility of DUV output generation in these crystals. (C) 2001 Elsevie
r Science Ltd. All rights reserved.