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Proceedings Paper

Picosecond Laser Spectroscopy With Avalanche Photodiodes
Author(s): K Berndt; H Duerr; D Palme
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Paper Abstract

We report on new approaches to picosecond fluorescence spectroscopy, using commercial silicon avalanche photodiodes (APD's) as opto-electronic cross-correlators. By integrating lock-in techniques, fluorescence radiation can be detected with 0.001 photons per pulse sensitivity. In our method, the internal gain of the APD is modulated in synchronism with a syncpumped cw dye laser. Using pulsed gain-modulation, time-domain measurements with an apparatus response FWHM of 150 ps can be accomplished. In a second mode, sinusoidal gain-modulation is employed, enabling frequency-domain measurements up to about 3000 MHz at multiples of the laser pulse repetition frequency. This mode also allows high-resolution lifetime-selective detection and fluorescence lifetime direct indication.

Paper Details

Date Published: 24 June 1988
PDF: 7 pages
Proc. SPIE 0909, Time-Resolved Laser Spectroscopy in Biochemistry, (24 June 1988); doi: 10.1117/12.945390
Show Author Affiliations
K Berndt, Central Institute of Optics and Spectroscopy (Germany)
H Duerr, Central Institute of Optics and Spectroscopy (Germany)
D Palme, Central Institute of Optics and Spectroscopy (Germany)


Published in SPIE Proceedings Vol. 0909:
Time-Resolved Laser Spectroscopy in Biochemistry
Joseph R. Lakowicz, Editor(s)

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