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Applied Spectroscopy

Applied Spectroscopy


  • Vol. 52, Iss. 2 — Feb. 1, 1998
  • pp: 303–307

Hybrid Photomultiplier: Its Characterization and Application as a Wide-Dynamic-Range Photon Detector

Angelo J. Alfano

Applied Spectroscopy, Vol. 52, Issue 2, pp. 303-307 (1998)

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The hybrid photomultiplier (HPMT) is commercially available in proximity- and electrostatically focused versions, and both contain a photocathode and a PIN-diode substrate. This recent addition to the family of photon detectors offers good timing characteristics, reasonable gain, excellent pulse height distribution, and a wide dynamic range. This report provides details on the wiring and characterization of a typical electrostatically focused production device for gain, impulse response, and pulse height and pulse integral linearity. A gain of 1.8 X 10 3 was obtained at less than the maximum high-voltage bias. The impulse response rise time was 1.0 ns and the fall time was 0.9 ns. The full width at half-maximum (FWHM) of the impulse response was 4.3 ns at 160 V reverse diode bias. The pulse height was linear up to 4.45 X 10 4 photoelectrons, and the pulse integral was linear up to the maximum tested (2.23 X 10 5 photoelectrons). The HPMT is not damaged by light levels that are three orders of magnitude beyond the range of linear response for a conventional PMT. Therefore, the HPMT can be directly implemented in spectroscopic applications that previously required elaborate gating schemes to protect a detector from a large optical flash that preceeds a weak subsequent optical event of interest.

Angelo J. Alfano, "Hybrid Photomultiplier: Its Characterization and Application as a Wide-Dynamic-Range Photon Detector," Appl. Spectrosc. 52, 303-307 (1998)

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