Optical device which can be used in space-domain filtering and frequency-domain spectrum-analysing systems

摘要

The optical device according to the invention comprises a dynamic optical system composed of a concave parabolic mirror 1, the concave surface of which is turned towards the entrance-exit (input-output) plane in which a reflection filter F, the centre of which coincides with the focal point of the concave parabolic mirror, is arranged between the information transparency 4 and the image receiver 5. It is characterised in that, in front of the reflection filter F, which is a holographic filter 3, is placed a non-linear adaptive optical element 8 having an amplitude transmission coefficient inversely proportional to the intensity of the incident light at each point of the filter 3. Usable in space-domain filtering and frequency-domain spectrum-analysing systems. IMAGE