Chapter 5 Common Operating Circuits - THORLABS DET100A User Manual

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
13056-S01
Voltage
V
BAT
Regulator
5V
10 V
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
Page 10