
66
4 Applications
4.1
Single Beam Experiment
This is the simplest optical chopping experiment. In this application, a
single optical beam is chopped by either the Inner or Outer track of slots,
and the reference output from the corresponding
Inner/Outer Slots Ref
Out
BNC connection is used as the Ref In to a lock‑in amplifier.
Lock-in Amplifier
SR542 Controller
Outer Slots Ref Out
Ref In
Source
Experiment
Detector
Figure 4.1:
Single Beam Experiment
SR542 Precision Optical Chopper