OPTICAL SYSTEM COMPRISING A SPATIAL LIGHT MODULATOR

摘要

The invention concerns an optical system (10) comprising:
a spatial light modulator (13) comprising an array of controllable elements adapted for generating a modulated light beam (17) by diffracting an incident light beam (12), the modulated light beam (17) comprising a modulated part and an unmodulated “zero order” part, the modulated part carrying an image to be projected into a replay volume (18),a control unit for applying a control signal to the controllable elements so as to control the modulated light beam (17) generated by the controllable elements,a perturbing optical element (30) for introducing optical aberrations in the incident light beam (12) and/or the modulated light beam (17) so as to spread the unmodulated “zero order” part of the modulated light beam in the replay volume (18), the perturbing optical element (30) generating distortions in the image to be projected, wherein the control signal comprises an image signal component carrying data representative of the image to be projected and a correction signal component representative of a correction pattern for correcting the distortions generated by the perturbing optical element (30) in the image to be projected.

主权项

1. An optical system (10) comprising:
a spatial light modulator (13) comprising an array of controllable elements adapted for generating a modulated light beam (17) by diffracting an incident light beam (12), the modulated light beam (17) comprising a modulated part and an unmodulated “zero order” part, the modulated part carrying an image to be projected into a replay volume (18), a control unit (20) for applying a control signal to the controllable elements so as to control the modulated light beam (17) generated by the controllable elements, wherein the optical system (10) comprises a perturbing aberrant optical element (30) for introducing optical aberrations in the incident light beam (12) and/or the modulated light beam (17) so as to spread the unmodulated “zero order” part of the modulated light beam (17) in the replay volume (18) where the image is projected, with a maximum intensity of the unmodulated “zero order” part in the replay volume (18) is less than a maximum intensity of the modulated part in all the replay volume (18), the perturbing aberrant optical element (30) generating distortions in the image to be projected,wherein the control signal comprises an image signal component carrying data representative of the image to be projected and a correction signal component representative of a correction pattern for correcting the distortions generated by the perturbing aberrant optical element (30) in the image to be projected.