| 摘要 |
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 arrange d 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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