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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 6 — Feb. 20, 2006
  • pp: 1254–1259

Gating a channel photomultiplier with a fast high-voltage switch: reduction of afterpulse rates in a laser-induced fluorescence instrument for measurement of atmospheric OH radical concentrations

Yugo Kanaya and Hajime Akimoto  »View Author Affiliations

Applied Optics, Vol. 45, Issue 6, pp. 1254-1259 (2006)

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By employing a commercially available high-voltage switch in a time-gating circuit to drive a channel photomultiplier (CPM), the afterpulse rates are significantly reduced in the time window to collect fluorescence > 200   ns after the pulsed laser excitation. The CPM, kept deactivated under normal conditions (normally off), is turned on immediately after the passage of the laser pulse by shifting the voltage applied to the photocathode by 150   V to collect the fluorescence. When the detection system is used as part of a laser-induced fluorescence instrument to measure atmospheric OH radicals with the photon-counting method, the background signal is reduced by more than a factor of 10 as compared with our previous case where a conventional dynode-gated photomultiplier tube (PMT) is used, while the sensitivity toward the fluorescence is almost unchanged. A detection limit as low as 2 × 10 5   radicals   cm 3 or 0.008 parts per trillion by volume is achieved for OH, with an integration time of 1 min and a signal-to-noise ratio of 2, enabling sensitive detection of the important radical in the atmosphere. This system is a superior choice with higher sensitivity and cost effectiveness as compared with the gated PMTs utilizing a microchannel plate as an electron multiplier, and could also be used effectively in light detection and ranging (lidar) instruments, where a delayed scattering signal would be efficiently discriminated from afterpulses.

© 2006 Optical Society of America

OCIS Codes
(010.7030) Atmospheric and oceanic optics : Troposphere
(040.5250) Detectors : Photomultipliers
(250.3140) Optoelectronics : Integrated optoelectronic circuits
(260.2510) Physical optics : Fluorescence
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:
Physical Optics

Original Manuscript: June 24, 2005
Revised Manuscript: October 1, 2005
Manuscript Accepted: October 2, 2005

Yugo Kanaya and Hajime Akimoto, "Gating a channel photomultiplier with a fast high-voltage switch: reduction of afterpulse rates in a laser-induced fluorescence instrument for measurement of atmospheric OH radical concentrations," Appl. Opt. 45, 1254-1259 (2006)

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