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Proceedings Paper

Simple small-sized lock-in light detection system using a gated Si avalanche photodiode
Author(s): Tsuyosh Miyata; Tetsuo Iwata; Tsutomu Araki
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Paper Abstract

We have constructed a simple small-sized lock-in light detection system using a gated Si avalanche photodiode (APD). The gate mode operation of the APD was achieved by a transistor-transistor-logic (TTL) signal superimposed on a direct current (dc) bias not exceeding the breakdown voltage of the APD. The attainable gain was thirty times larger than that obtained by the normal dc-biased APD. The APD is operated at a frequency of 2f (equals 20 kHz) and its output signal is fed into a compact laboratory-made lock-in amplifier that works in synchrony with the gated APD at a frequency f (equals 10 kHz). The system is useful for detecting a weak signal light superimposed on a large background.

Paper Details

Date Published: 8 May 2001
PDF: 4 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.426999
Show Author Affiliations
Tsuyosh Miyata, Niihama National College of Technology (Japan)
Tetsuo Iwata, Univ. of Tokushima (Japan)
Tsutomu Araki, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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