Design and Validation of an Acousto-Optic Tunable Filter for Spectro-Polarimetry Analysis
Samuel Dupont (Université Polytechnique Hauts de France)
Jurgen Vanhamel (TU Delft - Space Systems Egineering, Katholieke Universiteit Leuven)
Jean-Claude Kastelik (Université Polytechnique Hauts de France)
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Abstract
Acousto-Optic Filters are versatile devices with a range of applications in modern optics. Their technology has reached a mature industrialability. They are particularly valuable in fields requiring precise wavelength selection and fast switching capabilities, making them essential tools in various applications. The generalisation of their use has led to new applications still requiring specific developments.We present the design and validation of an AOTF for spectro-polarimetry analysis which provides a constant spectral resolution over a wide spectral band. The variation of the spectral resolution is made possible by the manufacture of a transducer divided into multiple electrodes allowing to play on the interaction length easily by activating and deactivating the electrodes. In addition, the power distribution supplying the electrodes can be modulated, which offers the possibility of finely controlling the spectral template.The device developed has an acoustic cut of 5°, operating from 450 to 800 nm. We opted for a transducer equipped with 5 electrodes. This strategy makes it possible, depending on the power supply conditions, to modulate the selectivity of the filter by a factor of 4 for a given wavelength and to maintain a constant selectivity of the order of 10 nm over the entire operating range.
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