Compound optical phase grating and switching devices...

Details Compound optical phase grating and switching devices... Compound optical phase grating and switching devices...

G - Physics

02

B

88/97.4

G02B 5/18 (2006.01) G02B 27/44 (2006.01)

Patent

CA 1242907

18 ABSTRACT The invention relates to a compound blazed opti- cal phase grating comprising at least two grating sections (U1, U2) which are disposed opposite each other in parallel planes and which have grooves which extend parallel to each other, the grating sections comprising equal grating per- iods and being movable relative to each other within their planes perpendicularly to the grooves. Over one grating period (.DELTA.) the optical pathlength varies at least sub- stantially parabolically and symmetrically relative to the grating period, in such a manner that in the case of a symmetrical position of the grating section relative to a common line perpendicular to the grating planes the opti- cal pathlength through the compound grating is constant. Various optical switches and switching matrixes can be formed by means of such a compound phase grating.

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