Patent ID: 6028706
Filing Date: 2000-02-22
Classification: G02B,H04B

Abstract:
An apparatus comprising:first and second surfaces, the second surface having a reflectivity which causes a portion of light incident thereon to be transmitted therethrough, the reflectivity of the second surface varying along the second surface, whereinthe apparatus receives an input light at a respective wavelength within a continuous range of wavelengths, andthe first and second surfaces are positioned so that the input light is reflected a plurality of times between the first and second surfaces to cause a plurality of lights to be transmitted through the second surface, the plurality of transmitted lights interfering with each other to produce an output light which is spatially distinguishable from an output light produced for an input light having any other wavelength within the continuous range of wavelengths,as the input light is reflected said plurality of times between the first and second surfaces, reflection by the second surface defines a plurality of reflected lights travelling from the second surface to the first surface, andthe plurality of reflected lights have a uniform optical phase along the second surface.