Amplitude modulation of light beam

Details Amplitude modulation of light beam Amplitude modulation of light beam

G - Physics

05

D

345/56

G05D 25/00 (2006.01) G02B 26/02 (2006.01)

Patent

CA 1081836

AMPLITUDE MODULATION OF LIGHT BEAM ABSTRACT An optical modulator suitable for use with a collimated light beam having a moderate cross section and a fast response time and operational at relatively low voltage includes, for example, a glass prism and a smooth metal surface that are separated by an adjustable gap. The gap is filled with a medium, for example, air, having an index of refraction lower than the prism. A beam of monochromatic light is passed into the prism at a specific angle of incidence to undergo total internal reflection at the glass prism-gap interface. A change of approximately 1 micron in the thickness of the gap is sufficient to change the reflectivity from greater than 95% to essentially zero. The size of the gap is mechanically adjusted and this mechanical device determines the frequency response of the light modulation.

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