Widely tunable deep ultraviolet generation in CLBO

In a single cut cesium lithium berate (CsLiB6O10 or CLBO) crystal we have g enerate deep UV radiation tunable from 195 to 265 nm (with a gap from 210 t o 226 nm due to crystal cut limitation), Radiation in the 195-210 nm region is generated by noncollinear sum-frequency mixing of Nd:YAG laser radiatio n with the second harmonic (239-262 nm) of the dye laser radiation. However , radiation in the region of 210-237.5 nm and 236.8-265 nm is generated by third harmonic and second harmonic generation of the dye laser, respectivel y. All three interactions for coverage of the said range are made in the sa me cut CLBO crystal Type-I, theta = 80 degrees and phi = 45 degrees. The sh orter wavelength tuning is phase-matching limited. A conversion efficiency of 14% is realised in our 5.5 mm long crystal for the generation of 241.7 n m radiation by Type-I second harmonic generation with a fundamental input b eam intensity as low as 14.6 MW/cm(2). (C) 2000 Elsevier Science B.V. All r ights reserved.