Method for spatially controlling the period and amplitude of...

G - Physics – 02 – B

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G02B 5/18 (2006.01)

Patent

CA 2344880

A method for spatially controlling the period and amplitude of Bragg filters in an optical medium having a longitudinal axis that is sensitive to at least some wavelength of electromagnetic radiation. A phase mask of period A is laid close to the optical medium at an angle a with respect to the longitudinal axis of the optical medium. A single beam of electromagnetic radiation is directed at an incidence angle ~ with respect to normal incidence on the phase mask so that the radiation is diffracted, resulting in an interference pattern having a period P impinged into the optical medium so that the period P of the interference pattern may be altered by changing the incidence angle ~ or the angle .alpha.. This method is simpler, more flexible and more suitable for mass production than existing methods.

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