Patent ID: 6915044

Claim:
A tunable interferometer comprising: a beam splitter for producing first and second write beams from an input beam; first and second reflectors for receiving the first and second write beams, respectively, from the beam splitter and directing the first and second write beams to intersect at a fixed location with an angle of intersection which is a function of impingement locations of the first and second write beams on the first and second reflectors, respectively; and means for varying the impingement locations of the first and second write beams on the first and second reflectors; wherein the means for varying the impingement locations comprises a tuning element for varying a point of impingement of the input beam on the beam splitter to cause the impingement locations of the first and second write beams on the first and second reflectors to vary, wherein the first and second reflectors have fixed positions, and wherein the beam splitter and the first and second reflectors are integrated in a single structure.