Feedback Controlyzer DigiLock 110
Page 54
Status: 5.12.17
Figure 39 Absorption signal of a Doppler-free Rb spectroscopy
Once the laser scans across the spectral function two different locking schemes can be implemented
using the AutoLock module of the DigiLock 110. First locking to the side of a fringe is presented (section
10.2.1) then the use of frequency modulation/demodulation to lock to a maximum or minimum is
explained (section 10.2.2).
10.2.1 Side of Fringe Locking
We are now ready to use the AutoLock module to lock the laser to the slope of a Doppler-free absorp-
tion line.
Figure 40 AutoLock setup for the PID controllers
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