An acousto-optic tunable filter (AOTF) is an all solid-state robust device with no-moving parts that has been used in the
development of hyperspectral imagers from the ultraviolet to the longwave infrared. Such a device is developed by bonding
a piezoelectric transducer on a specially cut prism in a birefringent crystal. When broadband white light is incident on the
prism input facet, two orthogonally polarized diffracted beams at a wavelength with a narrowband bandpass are
transmitted. The transmitted wavelength can be tuned by varying the applied radio frequency (RF). This is what is done
in a hyperspectral imager. An AOTF can also be used with multiple RFs applied at the same time to diffract a number of
different wavelengths. This mode can be exploited to design a tunable optical notch filter where multiple RFs are applied
simultaneously such that all wavelength in a specific range can transmit except for a specific wavelength which is notched.
We designed an optical system using a TeO2 AOTF with telecentric confocal optics operating in the shortwave infrared
(SWIR) with a 16-channel RF driver where both the amplitude and frequency can be controlled independently for each
channel. We will discuss the optical system, its characterization and present results obtained.