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Photon Counting Detectors

The available photon counting detectors include photomultiplier tubes (PMT), Hybrid photomultiplier detectors (HPD) and Single Photon Avalanche Diodes (SPAD) that cover different spectral ranges between the UV and the NIR. All detectors feature timing resolutions in the picosecond range, depending on model and operating conditions. The following table gives a rough overview about the key parameters:

PMA SeriesPMA Hybrid SeriesPDM Series
Timing resolution (FWHM)<180 ps<50 ps to <160 ps<50 ps to <250 ps
Detection efficiency maximum40% at 400 nm45% at 500 nm49% at 550 nm
Spectral range185 nm to 920 nm220 nm to 890 nm400 nm to 1100 nm
Size of active area8 mm3, 5 or 6 mm20, 50 or 100 ┬Ám

PMA Hybrid Series

Hybrid Photomultiplier Detector Assembly

  • Timing resolution down to < 50 ps (FWHM, cathode dependent)
  • Detection efficiency up to 45 % (cathode dependent)
  • Active area up to 6 mm
  • Negligible afterpulsing
  • NEW: analog output provides positive voltage proportional to count rate
  • NEW: -07 and -42 cathodes with spectral ranges between 220 and 870 nm, detection efficiency up to 25 %
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PMA Hybrid Series Hybrid Photomultiplier Detector Assembly

PMA Series

Photomultiplier Detector Assembly

  • Timing resolution < 180 ps (FWHM)
  • Quantum efficiencies up to 40% (cathode dependent)
  • Spectral ranges from 185 nm to 920 nm available
  • Optional thermoelectric cooler
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PMA Series Photomultiplier Detector Assembly

PDM Series

Single Photon Avalanche Diodes

  • Timing resolution down to < 50 ps (FWHM)
  • Detection efficiency up to 49 %
  • Different active areas: 20, 50, and 100 µm
  • Ultra stable at high count rates
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PDM Series Single Photon Avalanche Diodes