Sum frequency generation at 309 nm using a violet and a near-IR DFB diode laser for detection of OH
- Cite this article as:
- Corner, L., Gibb, J., Hancock, G. et al. Appl Phys B (2002) 74: 441. doi:10.1007/s003400200810
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.