Abstract.
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.
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Received: 16 November 2001 / Revised version: 23 January 2002 / Published online: 14 March 2002
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Corner, L., Gibb, J., Hancock, G. et al. Sum frequency generation at 309 nm using a violet and a near-IR DFB diode laser for detection of OH . Appl Phys B 74, 441–444 (2002). https://doi.org/10.1007/s003400200810
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DOI: https://doi.org/10.1007/s003400200810