Radiation at 308 nm has been obtained by frequency doubling the output of a
commercial diode laser cooled to 165 K. A single pass through a crystal of
LiIO3 converted 1 mW of 616 nm radiation to 50 pW of UV, and this was used
to detect the OH radical in absorption in a flow tube. Possible extensions
of the method for detection of OH in the atmosphere are discussed. (C) 200
0 Elsevier Science B.V. All rights reserved.