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Tailored UV-laser source for fluorescence spectroscopy of biomolecules
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2007 (English)In: Optics and lasers in engineering, ISSN 0143-8166, E-ISSN 1873-0302, Vol. 45, no 4, 444-449 p.Article in journal (Refereed) Published
Abstract [en]

A dual-wavelength UV-laser source was developed for biosensing. First, a passively Q-switched diode-pumped Nd:YAG laser was constructed. The astigmatic diode output beam was converted into a homogenous beam profile by utilizing a mode converter. As a result, a frequency-doubling conversion efficiency of 50% was achieved in a periodically poled KTiOPO4. With a repetition rate of 100 Hz, the pulse energies and lengths were 650 mu J and 1.8 ns, respectively, at 532 nm with a M-2 of 1.3. The UV-generation is based on cascaded parametric processes using an intra-cavity sum-frequency mixing scheme in a periodically poled KTiOPO4 parametric oscillator pumped at 532 nm. Here, the wavelengths 293 and 343 nm were generated, with conversion efficiencies of 7% and 6.5%, respectively, in respect to 532 nm. With pulse length 1 ns and an average power above 2.7 mW, the wavelengths were used for fluorescence measurements of nonpathogenic bacteria.

Place, publisher, year, edition, pages
2007. Vol. 45, no 4, 444-449 p.
Keyword [en]
diode pump solid-state laser, beam transformation, beam shaping, optical parametric oscillator, parametric devices, ultraviolet generation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-57095DOI: 10.1016/j.optlaseng.2005.03.016ISI: 000245108800002OAI: oai:DiVA.org:su-57095DiVA: diva2:414432
Note
authorCount :3Available from: 2011-05-03 Created: 2011-05-03 Last updated: 2017-12-11Bibliographically approved

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