OCTAVE SPECTRA ACOUSTO-OPTIC TUNEABLE FILTER

摘要

A method for increasing the tunable range of a single acousto-optic tunable filter (200) includes the steps of generating an active steering beam on a piezoelectric transducer (300) to reduce the tuning frequency at short wavelengths and increasing the tuning frequency at long wavelengths. The piezoelectric transducer is mounted in relation with an optically transparent crystal (205) at an angle such that the fixed launch angle in combination with the driving frequency provides a greater that one octave spectra to be filtered in a single AOTF.