Modulating a light beam

Details Modulating a light beam Modulating a light beam

G - Physics

02

B

G02B 5/18 (2006.01) B81B 3/00 (2006.01) G02B 26/00 (2006.01) G02B 26/08 (2006.01)

Patent

CA 2133335

A modulator (10) for modulating incident rays of light, the modulator having several equally spaced beam elements (18), each having a light reflective planar surface. The beam elements are arranged and supported (12) parallel to each other, with their reflective surfaces parallel. During operation, the elements remain parallel, but the modulator moves the beams so that the per- pendicular spacing of their reflective surfaces changes between two configurations. In both configurations, the spacing equals m/4 times the wavelength of incident light. In the first configuration, m equals an even whole number or zero, and the modulator acts to reflect the incident rays of light as a plane mirror. In the second configuration, m equals an odd number and the modula- tor diffracts the incident rays as they are reflected.

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