General Information; Ordering Codes And Accessories - THORLABS APD450C Operation Manual

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 APD450C temperature-compensated Avalanche Photodetector combines a high-
sensitivity Avalanche Photodiode for detection of light from 1260 nm to 1620 nm with a spe-
cially designed ultra-low-noise transimpedance amplifier for detection of optical signals from
0.3 MHz to 1600 MHz.
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 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 APD450C 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.
14
WARNING
Do not remove covers! Dangerous deadly high voltage!

1.1 Ordering Codes and Accessories

Temperature Compensated Avalanche Photodetector, InGaAs APD, 1260 -
APD450C
1620 nm, Bandwidth Range 0.3 MHz - 1600 MHz, Active Area Diameter: 75 mm
(with ball lens 1.5 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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