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1 General Information
Avalanche Photodetectors (APDs) have an exceptionally low noise-equivalent power (NEP),
making them ideal for fast low-level light detection applications, such as spectroscopy, fluores-
cence measurements, laser radar and optical rangefinders. Due to their very high sensitivity,
Avalanche Photodetectors can replace Photomultiplier Tubes (PMT) in many applications.
The Thorlabs APD440x temperature-compensated Avalanche Photodetectors combine a high-
sensitivity Avalanche Photodiode with a specially designed ultra-low-noise transimpedance
amplifier for detection of optical signals from DC to 100 kHz .
The continuously adjustable gain is based on the adjustment of the APDs multiplication factor
(M-factor). Each detector also features a special electronic circuit to compensate for the tem-
perature dependency of the M-factor.
The detectors are sensitive to light within the wavelength range of 400 nm - 1000 nm
(APD440A) and 200 nm - 1000 nm (APD440A2).
The detector housing can be integrated in optical setups using convenient 8-32 and M4 combi-
thread mounting holes that are compatible with both imperial and metric threading.
The housing accommodates Thorlabs' SM05 (0.535"-40) and SM1 (1.035"-40) threaded adap-
ters and accessories. This allows convenient mounting of external optics, light filters, and aper-
tures. The product includes a SM1T1 SM1 Coupler which adapts the external thread to an in-
ternal thread and holds the SM1RR Retaining Ring and a reusable protective plastic cover cap.
For accessories, please visit our website or contact
The APD440x Avalanche Photodetectors are powered by the included external power supply
LDS12B (±12 VDC, 250 mA) via a PICO M8 power connector. The appropriate input voltage
(100 VAC, 120 VAC, 230 VAC) can be selected with a switch on the
Attention
Please find all safety information and warnings concerning this product in the chapter
Safety
in the Appendix.
16
WARNING
Do not remove covers! Dangerous deadly high voltage!
1.1 Ordering Codes and Accessories
Avalanche Photodetector, Silicon APD, 400 - 1000 nm, Bandwidth Range DC -
APD440A
100 kHz, Active Area Diameter 1.0 mm, Combi-Thread Mounting Holes Com-
patible with 8-32 and M4 Threads
Avalanche Photodetector, UV-enhanced Silicon APD, 200 - 1000 nm, Band-
APD440A2
width Range DC - 100 kHz, Active Area Diameter 1.0 mm, Combi-Thread
Mounting Holes Compatible with 8-32 and M4 Threads
© 2020 Thorlabs
Thorlabs
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power supply
1 General Information
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