THORLABS SPDMH2, Руководство по эксплуатации, Страница: 5 / 22

Rev: 1.1, 23-May-2022 © 2022 Thorlabs Page 1
SPDMHx Series 1 General Information
1 General Information
The Thorlabs SPDMHx Series modules detect single photons of light within the wavelength
range from 400 nm to 1000 nm. Their high photon detection efficiency (PDE) with a low dark
count rate across a wide dynamic range results from the combination of the ultra-low-noise sil-
icon avalanche photodiode with specially developed quenching and signal processing electron-
ics. Incoming photons generate corresponding electrical pulses and are converted to a TTL
pulse which is output at the LEMO connector. A LEMO to BNC adapter is included.
The gating function allows the module to be disabled between measurements and to provide
protection against accidental overload.
The detectors are available with different dark count rates: SPDMH2 and SPDMH2F are spe-
cified with a dark count rate of 100 Hz while for SPDMH3 and SPDMH3F, Thorlabs specifies a
250 Hz dark count rate.
The detectors can be purchased in a free space version (item #s SPDMH2 or SPDMH3) or with
an FC-PC fiber-optic receptacle, pre-aligned to the optical detector to connect a multimode op-
tical fiber with an FC connector (item #s SPDMH2F or SPDMH3F).
Applications range from quantum technologies and cryptography to particle sizing fluorescence
analysis, LIDAR, and spectroscopy.
Attention
Please find all safety information and warnings concerning this product in the chapter Safety in
the Appendix.
1.1 Ordering Codes and Accessories
SPDMH2 Free Space Avalanche Photodetector, Silicon APD, 400 - 1000 nm, Dark Count
Rate 100 Hz, Active Area Diameter 100
m m, Free Beam
SPDMH2F Avalanche Photodetector for Fiber Coupling, Silicon APD, 400 - 1000 nm, Dark
Count Rate 100 Hz, Active Area Diameter 100
m m, FC/PC Connector for Fiber
Coupling
SPDMH3 Free Space Avalanche Photodetector, Silicon APD, 400 - 1000 nm, Dark Count
Rate 250 Hz, Active Area Diameter 100
m m, Free Beam
SPDMH3F Avalanche Photodetector for Fiber Coupling, Silicon APD, 400 - 1000 nm, Dark
Count Rate 250 Hz, Active Area Diameter 100
m m, FC/PC Connector for Fiber
Coupling
Optional Accessories (Sold Separately)
· Optical Input Fiber for SPDMH2F or SPDMH3F. Fiber Requirements as Stated Under
Technical Data
· Optical Component Threading Adapters for Mounting on the SM1 Internal Thread
· Thorlabs BA4 mounting base
· 3-Axis Translation Stage
Please visit our homepage http://www.thorlabs.com for various accessories like fiber adapters,
posts and post holders, data sheets and further information.