Holographic scanning

Details Holographic scanning Holographic scanning

1995-06-06

1996-09-10

Henry, Jon W.

Optical: systems and elements

Diffraction

From grating

359573, 359569, 359 18, G02B 518, G02B 532, G02B 2744

Patent

active

055551300

ABSTRACT:
A holographic grating element is provided which enables tracing different scan lines. The element is divided into a plurality of sectors. A first grating pattern is provided which diffracts a beam in one direction, and a second grating pattern is next to the first and diffracts the scan beam in the reverse direction. Sectors can be produced with different sector sizes to enable scanning at different rates in the reverse direction, or in successive scans in the same direction. Angle relationships are described to produce diffraction patterns for a desired relationship between disc rotation and the angle of the scan line.

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