Patent ID: 9535309
Date: 2017-01-03
CPC Classifications: G02B,G02F

Claim:
1. Compensator system adapted to compensate for the angular dispersion of electromagnetic beams deflected by at least one acousto-optic deflector of an optical system, wherein the angular dispersion of each deflected beam is dependent on the deflection angle obtained by the deflecting acoustic frequency of the acousto-optic deflector, characterised in that the compensator system comprises: a first lens group for spatially separating the deflected beams of different deflection angle and angular dispersion by focusing the beams into the focal plane, a compensator element having a first surface and a second surface, and being arranged such that the first surface of the compensator element lies in the focal plane of the first lens group, and the first and second surfaces of the compensator element have nominal radii R a second lens group arranged so as to substantially parallelise the different wavelength components of each deflected beam exiting the compensator element while maintaining the angular variation of the beams deflected at different acoustic frequencies.