Copyright © 2017 Thorlabs
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TED4015
To 2.
If the internal power dissipation changes (e.g. the laser current is changed), the temperature
gradient between laser and sensor changes as well. This results in a measurement error de-
pending on the mechanical setup laser/sensor. Changes in the ambient temperature however
will be compensated well by the control loop since they will almost only have an effect on the
heat slope between TEC element and cooling element.
Possible solution: improved thermal design
To 3.
The transient response after setting a new temperature is limited since the heat transport in the
heat sink is relatively slow. Furthermore the temperature slope in the heat sink must form anew.
The sensor (which also possesses a significant heat capacity) must settle to the laser tempera-
ture.
Possible solution: PID controller adjustment
