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Dispersion Element for Opto-Optical Deflector

IP.com Disclosure Number: IPCOM000047445D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Roosen, G: AUTHOR [+2]

Abstract

An improved dispersion element for an opto-optical deflector is described which combines two gratings and one beamsplitter into one small, easy-to-align element. The element is produced by coating two faces 2, 3 of a beamsplitter cube 1 with a suitable photoresist material. A hologram is then formed on each of the faces 2 and 3 which comprises a phase grating. An incident probe beam 4 is then split by the beamsplitter so that each of the two component beams is incident on one of the gratings. Two identical optical systems are provided to overlap the two diffracted beams onto a non-linear medium 5 where they generate a phase grating whose spatial frequency and orientation change with wavelength. Thus, a probe beam with fixed angle of incidence is diffracted through a range of angles while always satisfying Bragg's law.

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Dispersion Element for Opto-Optical Deflector

An improved dispersion element for an opto-optical deflector is described which combines two gratings and one beamsplitter into one small, easy-to-align element. The element is produced by coating two faces 2, 3 of a beamsplitter cube 1 with a suitable photoresist material. A hologram is then formed on each of the faces 2 and 3 which comprises a phase grating. An incident probe beam 4 is then split by the beamsplitter so that each of the two component beams is incident on one of the gratings. Two identical optical systems are provided to overlap the two diffracted beams onto a non-linear medium 5 where they generate a phase grating whose spatial frequency and orientation change with wavelength. Thus, a probe beam with fixed angle of incidence is diffracted through a range of angles while always satisfying Bragg's law.

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