Picosecond Laser Spectroscopy With Avalanche Photodiodes

K Berndt; H Duerr; D Palme

doi:10.1117/12.945390

24 June 1988 Picosecond Laser Spectroscopy With Avalanche Photodiodes

K Berndt, H Duerr, D Palme

Proceedings Volume 0909, Time-Resolved Laser Spectroscopy in Biochemistry; (1988) https://doi.org/10.1117/12.945390
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

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.

Citation Download Citation

K Berndt, H Duerr, and D Palme "Picosecond Laser Spectroscopy With Avalanche Photodiodes", Proc. SPIE 0909, Time-Resolved Laser Spectroscopy in Biochemistry, (24 June 1988); https://doi.org/10.1117/12.945390

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