Abstract
The transparency range of (BBO) was expanded by means of cooling, and the resulting absorption coefficient at 193.4 nm was reduced to at 91 K from at 295 K. Further, generation of light at 186.0 nm (the measurement limit in air) by type I sum-frequency generation (SFG) based on fundamental (744-nm) and third-harmonic (248-nm) light from a Ti:sapphire laser was confirmed for cooled BBO. Calculations based on observed data for SFG wavelengths and phase-matching angles indicate a potential for cooled BBO to generate wavelengths as low as 181.7 nm.
© 1999 Optical Society of America
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