Stabilized Benchtop IR Light Source
Chapter 3: Product Overview
Rev B, August 4, 2021
Page 5
3.4. Output Stabilization
Unlike traditional light sources, the SLS303 will not suffer from a gradual decrease nor short term fluctuation in
brightness during its lifetime.
The SLS303 silicon nitride 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 3.5 Closed Feedback Loop in SLS303
