THORLABS ITC8 Series, Руководство по эксплуатации

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24 Optimization of temperature control
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© 2010 Thorlabs
1.7 Optimization of temperature control
1.7.1 Setup and function of temperature controllers
When diode laser systems are tempered mainly the following components are
involved:
•
The component to be tempered (laser diode)
•
A sensor measuring the temperature of the component (thermistor / AD590 /
LM335)
•
A heat source or sink (air or water / cooling element)
•
A heat conductor connecting the component to the source/sink (copper, aluminum)
•
A "propulsion" to lead the thermal flow (TEC element)
laser
sensor
copper bloc
TEC element
heat sink
Figure 10 Principle set-up of laser temperature control
Influences on the real temperature control loop
To 1: Offset and gain errors of the sensor allow only an estimate of the laser
temperature.
The sensor is never fixed directly to the laser chip to measure its “real”
temperature. The inhomogeneous temperature in the copper bloc will influence
the measurement. Even within the laser chip you will find a temperature
gradient.
Possible optimization: calibration of sensor