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Active disturbance rejection control of temperature for ultrastable optical cavities

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7 Author(s)
Pizzocaro, M. ; Ist. Naz. di Ricerca Metrol. (INRIM), Turin, Italy ; Calonico, D. ; Calosso, C. ; Clivati, C.
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This paper describes the application of a novel active disturbance rejection control (ADRC) to the stabilization of the temperature of two ultra-stable Fabry-Perot cavities. The cavities are 10 cm long and entirely made of ultralow- expansion glass. The control is based on a linear extended state observer that estimates and compensates the disturbance in the system in real time. The resulting control is inherently robust and easy to tune. A digital implementation of ADRC gives a temperature instability of 200 μK at one day of integration time.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:60 ,  Issue: 2 )