Chapter 5 Common Operating Circuits - THORLABS DET10A User Manual

Si Biased Detector

Chapter 5 Common Operating Circuits

Protection Diode
On/Off
Switch
Battery
The DET Series Detectors are designed according the circuit depicted above. The
detector is reverse biased to produce a linear response with applied input light.
The photocurrent generated is based upon the incident light and wavelength and
can be viewed on the oscilloscope by attaching a load resistance on the output.
The function of the RC Filter is to filter any high frequency noise from the input
supply which may contribute to a noisy output.
Photodetector
-V
GND
Rev I, September 28, 2017
V
BAT Voltage
Regulator
Figure 2 Basic DET Circuit
Feedback
R
F
A
B
Transimpedance Amp
GND
Figure 3 Amplified Detector
Chapter 5: Common Operating Circuits
RC Filter
Resistor V Bias
1 kΩ
Capacitor 0.1 µF
GND
Out
External
BNC
Photodetector
BNC
R
LOAD
GND
R
LOAD
GND
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