Compact Stabilized Light Sources Chapter 3: Product Overview
Rev F, October 14, 2021 Page 7
3.6. Output Stabilization
Unlike traditional filament based light sources, the SLS201L/SLS202L will not
suffer either from a gradual decrease or short term fluctuation in brightness during
its lifetime.
SLS201L/SLS202L light source is equipped with an internal feedback loop and
therefore can ensure a constant intensity, low noise and long life span. The
principle of operation is depicted in the block diagram below. The optical intensity
is measured by an internal photodiode, which feeds its monitor signal to the
controller unit. The controller unit then adjusts the driving current of the power
supply to compensate any drift or fluctuation in the optical output.
Figure 6 Closed Feedback Loop in SLS201L/SLS202L
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