, Volume 74, Issue 4-5, pp 441-444

Sum frequency generation at 309 nm using a violet and a near-IR DFB diode laser for detection of OH

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We have used a violet diode laser at 404 nm and a distributed feedback diode laser at 1320 nm to produce 0.8 nW of radiation at 309 nm by sum frequency generation in beta-barium borate. The UV radiation was tuned mode-hop-free over 30 GHz and used to detect OH radicals produced in a microwave discharge. By chopping the UV light at 500 Hz, we observed a concentration of 2×1012 cm-3 with a signal to noise ratio of 30:1.

Received: 16 November 2001 / Revised version: 23 January 2002 / Published online: 14 March 2002