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Proceedings Paper

Improvement of a fluorescence immunoassay with a compact diode-pumped solid state laser at 315 nm
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Paper Abstract

We demonstrate the improvement of fluorescence immunoassay (FIA) diagnostics in deploying a newly developed compact diode-pumped solid state (DPSS) laser with emission at 315 nm. The laser is based on the quasi-three-level transition in Nd:YAG at 946 nm. The pulsed operation is either realized by an active Q-switch using an electro-optical device or by introduction of a Cr4+:YAG saturable absorber as passive Q-switch element. By extra-cavity second harmonic generation in different nonlinear crystal media we obtained blue light at 473 nm. Subsequent mixing of the fundamental and the second harmonic in a β-barium-borate crystal provided pulsed emission at 315 nm with up to 20 μJ maximum pulse energy and 17 ns pulse duration. Substitution of a nitrogen laser in a FIA diagnostics system by the DPSS laser succeeded in considerable improvement of the detection limit. Despite significantly lower pulse energies (7 μJ DPSS laser versus 150 μJ nitrogen laser), in preliminary investigations the limit of detection was reduced by a factor of three for a typical FIA.

Paper Details

Date Published: 23 October 2006
PDF: 9 pages
Proc. SPIE 6380, Smart Medical and Biomedical Sensor Technology IV, 63800M (23 October 2006); doi: 10.1117/12.685993
Show Author Affiliations
Matthias Niederkrüger, Laser-Lab. Göttingen e.V. (Germany)
Christian Salb, Laser-Lab. Göttingen e.V. (Germany)
Michael Beck, Univ. Potsdam (Germany)
Niko Hildebrandt, Univ. Potsdam (Germany)
Hans-Gerd Löhmannsröben, Univ. Potsdam (Germany)
Gerd Marowsky, Laser-Lab. Göttingen e.V. (Germany)

Published in SPIE Proceedings Vol. 6380:
Smart Medical and Biomedical Sensor Technology IV
Brian M. Cullum; J. Chance Carter, Editor(s)

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