AOTF DEVICE FOR PROGRAMMABLE ACOUSTO-OPTICAL FILTERING OF HIGH SPECTRAL RESOLUTION AND LARGE ANGULAR OPENING IN THE INFRARED DOMAIN.

摘要

The subject of the invention is an AOTF device for the spectrophotometric high-resolution programmable infrared acousto-optical filtering, comprising a birefringent acousto-optical crystal TR, a transducer T ensuring the generation of an acoustic wave. transverse, allowing diffraction of an ordinary incident optical wave O, of incidence θ, into an extraordinary optical wave Od, of angle θ, knowing that the above diffraction is equivalent to a reflection close to the normal to the wave plane of the aforesaid incident optical wave O, the aforesaid angle θ of the diffracted optical wave O is equivalent to the aforesaid incident θ of the incident optical wave O, increased by a value between 160 and 180 degrees.