Excelitas Single Photon Counting Module SPCM-AQRH Series

Product Overview

Excelitas SPCM-AQRH Series

Excelitas’ newly enhanced SPCM-AQRH Single-Photon Counting Module detects single photons over the wavelength range of 400 nm to 1064 nm with performance parameters superior to other solid state or vacuum-tube based photon counters.

Single Photon Counting Module
The SPCM-AQRH uses a unique silicon avalanche photodiode (SLiK) with a circular active area, achieving peak photon detection efficiency greater than 70% at 650 nm over a 180 µm diameter, with unmatched uniformity over the full active area. A TTL-level pulse is generated for each photon detected and the signal is available at the BNC connector at the rear of the module.

The photodiode is both thermoelectrically cooled and temperature controlled, ensuring stabilized performance despite ambient temperature changes. Operating temperature range has been increased and the module will function with case temperatures between 5°C and 70°C.

The module comes as standard with a free-space window to the APD, with FC fiber adapter, C-mount or tube cage mount bracket/adapter options.

Recent electronic circuit enhancements have reduced the minimum dead time to less than 25 ns, thereby increasing linearity and improving the dynamic range of the module. Timing resolution of the module was also improved significantly. The SPCM-AQRH has internal protection circuitry that protects the avalanche photodiode and the module electronics from damage due to accidental overload from exposure to ambient lighting.

– Quantum Cryptography
– Photon correlation spectroscopy
– Astronomical observation
– Optical range finding
– Adaptive optics
– Ultra-sensitive fluorescence
– Particle sizing
– Microscopy


– Peak PDE: > 70% @ 650nm
– 180µm active area
– > 35 Mcps dynamic range
– Gated output
– Single +5 V supply
– RoHS-compliant
– Low after pulse probability
– High uniformity over large active area
– Unmatched linearity
– Free space window, FC fiber adaptor, C-mount bracket, Tube cage mount bracket options


Model Output Pulse Options X – Maximum Dark Count Rates (cps) Optical Mounting Bracket
(Non FC Module only)
SPCM-AQRH-WX (-FC)(-BR_) Output Pulse Width (ns) Dead Time (ns) Output Pulse Height (V) -W0 -W1 -W2 -W3 -W4 -W5 -W6 -BR1 -BR2
SPCM-AQRH-1X 10 24 2.2 1500 1000 500 250 100 50 25 SM1 C-MOUNT
SPCM-AQRH-2X 18 28 2.2 1500 1000 500 250 100 50 25 SM1 C-MOUNT
SPCM-AQRH-3X 28 35 2.2 1500 1000 500 250 100 50 25 SM1 C-MOUNT
SPCM-AQRH-4X 10 24 4.4 1500 1000 500 250 100 50 25 SM1 C-MOUNT
SPCM-AQRH-5X 18 28 4.4 1500 1000 500 250 100 50 25 SM1 C-MOUNT
SPCM-AQRH-6X 28 42 4.4 1500 1000 500 250 100 50 25 SM1 C-MOUNT



Excelitas < 500 cps DC FC connector, RoHS compliant

Enquire for availability


Excelitas SPCM, <100 cps, with FC Connetor, RoHS

Enquire for availability


Excelitas SPCM <100 cps dark count (DC)

In stock


Excelitas SPCM, <500c/s RoHS compliant SPCM01

Enquire for availability


Excelitas SPCM, <250c/s w/FC Connector, RoHS compliant SPCM01

Enquire for availability


Excelitas SPCM, <250c/sec RoHS compliant SPCM01

Enquire for availability

You may also like…

Excelitas Single Photon Counting Module SPCM-AQ4C – Single Photon Counting
Enquire about this product

Ask our experts

Feel free to speak to us about any of our services or what else we may be able to provide your business.

You can call us on a href="tel:01527830800">01527 830800 or message us below.

[contact-form-7 404 "Not Found"]

Secure Payments