THORLABS SPDMA, Руководство по эксплуатации

Страница: 5 / 21

Rev: 1.0, 08-Dec-2021 © 2021 Thorlabs Page 1
SPDMA 1 General Information
1 General Information
The Thorlabs' SPDMA Single Photon Detector uses a cooled silicon avalanche photodiode,
specialized for a wavelength range from 350 to 1100 nm with a maximum sensitivity at 600 nm.
Incoming photons are converted into a TTL pulse in the detector. The SMA connection offers a
direct output pulse signal from the module that can be viewed on an oscilloscope or connected
to an external counter.
An integrated Thermo Electric Cooler (TEC) element stabilizes the diode's temperature to re-
duce the dark count rate. The low dark count rate and high photon detection efficiency allow
detection of power levels down to fW. The active quenching circuit integrated into the diode of
the SPDMA enables high count rates. The output signal can further be optimized by continuous
adjustment using the Gain Adjustment Screw.
Using a TTL Trigger IN signal, the SPDMA can be externally triggered to select the time frame
for the detection of single photons.
Optical alignment is simplified by the relatively large active area of the diode with a diameter of
500
m
m. The diode is actively aligned at the factory to be concentric with the input aperture,
which adds to the high quality of this device.
For flexible integration into optical systems, the SPDMA accommodates any Thorlabs 1'' lens
tubes as well as the Thorlabs 30 mm Cage System . The SPDMA can be mounted in metric or
imperial systems due to 8-32 and M4 combi-thread mounting holes.
The product includes an SM1T1 SM1 Coupler which adapts the external thread to an internal
thread and holds the SM1RR Retaining Ring and a reusable protective plastic cover cap.
Another advantage is that the SPDMA cannot be damaged by unwanted ambient light, which is
critical for many photomultiplier tubes.
Attention
Please find all safety information and warnings concerning this product in the chapter Safety in
the Appendix.
1.1 Ordering Codes and Accessories
SPDMA Single Photon Detector, 350 nm - 1100 nm, Active Area Diameter 0.5 mm,
Combi-Thread Mounting Holes Compatible with 8-32 and M4 Threads
Included Accessories
·
Power Supply (±12 V, 0.3 A / 5 V, 2.5 A)
·
Plastic Cover Cap (Item # SM1EC2B) on an included SM1T1 SM1 Coupler with an
SM1RR SM1 Retaining Ring .
Optional Accessories
·
All Thorlabs internal or external SM1 (1.035"-40) threaded accessories are compatible
with the SPDMA.
·
The 30 mm Cage System can be mounted on the SPDMA.
Please visit our homepage http://www.thorlabs.com for various accessories like fiber adapters,
posts and post holders, data sheets and further information.