A microprocessor-controlled photon counter for pulsed optically detected magnetic resonance

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Authors
Power, R. K.
Nishimura, A. M.
Issue Date
1979-08-01
Type
Article
Language
eng
Keywords
Research Support, N.I.H., Extramural
Research Projects
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Abstract

In pulsed optically detected magnetic resonance (ODMR) spectroscopy, a lock-in amplifier is used to monitor the signal which is phase-matched to the duty cycle of an applied sequence of pulses. However, since the desired signals reside atop a much larger amplitude-modulated signal, lock-in amplification methods are difficult to use. Commerically available photon counters are of limited use, because the pulsed ODMR method requires sequential counting over several time intervals, often with minimum time delay between the intervals. The multiaccumulator photon counter described here is capable of such sequential counting over as many as four intervals. The microprocessor which controls the counter algebraically manipulates the photon counts during each of the duty cycles. The result is an inexpensive yet versatile photon counter which is suited for pulsed ODMR and other applications in which sequential counting is necessary.

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Citation
The Review of scientific instruments. 1979 Aug; 50(8): 969-71.
Publisher
American Institute of Physics
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ISSN
0034-6748
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