AOTF DEVICE FOR THE PROGRAMMABLE ACOUSTO‑OPTICAL FILTERING OF HIGH SPECTRAL RESOLUTION AND OF LARGE ANGULAR APERTURE IN THE INFRARED REGION

摘要

The subject of the invention is an AOTF device for the programmable acousto‑optical filtering of high spectral resolution and of large angular aperture in the infrared region, comprising a birefringent acousto‑optical crystal TR, a transducer T ensuring the generation of a transverse acoustic wave, allowing a diffraction of an ordinary incident optical wave 0_o, of incidence θ_o, into an extraordinary optical wave O_d, of angle θ_d, knowing that the abovementioned diffraction is equivalent to a reflection close to the normal to the wave plane of the abovementioned incident optical wave O_o, the abovementioned angle θ_d of the diffracted optical wave O_d is equivalent to the abovementioned angle of incidence θ_o of the incident optical wave 0_o, plus a value lying between 160 and 180 degrees.