Laser 2000

SPAD PDM Series

There are 22 variations of the single-photon detection modules, each with varying grades (A-F) and active area (20µm – 100µm). Please find the different variations below with their specifications and for any guidance contact our experts.

The PDM series of photon counting detector modules are all solid-state instruments. They have a photon detection efficiency of 49% at 550nm and generate a TTL output pulse per detected photon. With the fast-timing option (additional circuit board installed), they provide better than 50ps FWHM photon timing resolution.

The excellent photon detection efficiency and superior timing resolution is obtained through the use of epitaxial silicon Single Photon Avalanche Diodes (SPAD) and patented integrated Active Quenching Circuits (iAQC), specifically designed and optimized for photon counting applications. Low-noise SPADs and low-power iAQCs make these modules ideal for portable equipment and all applications requiring low power consumption.

Low-noise SPADs and low-power iAQCs make these modules ideal for portable equipment and all applications requiring low power consumption.

PDM Modules are available in different grades depending on dark counts specifications. Not cooled module with high dark counts can be supplied to meet special OEM requirements.

Specifications @ 25°C and 5V overvoltage

Photon Detection Efficiency Min TYP Max Units
400nm 21 24 %
550nm 45 49 %
650nm 34 37 %
Single Photon Timing Resolution
TTL Counting Output 250 PS(FWHM)
NIM Timing Output (additional internal circuit board required) 35 50 PS(FWHM)
After-pulsing probability 0.1 3 %
Dead Time 77 ns
Supply Voltage unregulated DC, any value 5V ~ 12V
TTL Output pulse rise and fall times
Output pulse duration
Gating input
Supply input connector
< 2ns on 10pF load
20ns typical
5V CMOS control (0V gates detector off
Standard 3.5mm supply socket

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