Colloquium: Aleksandr Pavlov (Space)

Acousto-Optic Tunable Filters (AOTFs) are compact devices that filter specific wavelengths of light through Acousto-Optic (AO) interaction, where a piezoelectric transducer generates an acoustic wave within the crystal based on a supplied Radio Frequency (RF) signal. This capability makes them promising for Earth observation missions on small satellite platforms. However, accurately simulating AOTF behaviour across various optical wavelengths has posed to be challenging due to lack of optical simulations, limiting their integration into optical systems. To address this gap, this thesis develops a 3D optical model for non-collinear TeO₂-based AOTFs, the most widely used configuration. The model calculates the optimal RF signal for peak diffraction efficiency across various optical wavelengths and simulates light interactions within the acoustic field at multiple angles and polarizations. Validated with experimental data, the model also includes an optimization algorithm to estimate key AOTF parameters often unavailable from manufacturers, broadening AOTF usability and facilitating their integration into diverse optical systems.

Supervisor: Jurgen Vanhamel