Light beam scanning apparatus

Details Light beam scanning apparatus Light beam scanning apparatus

1997-04-23

2000-09-26

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 18, 359566, G02B 2610, G02B 532, G02B 518

Patent

active

061249556

ABSTRACT:
A light-beam scanning apparatus includes at least two holograms with an optical path length difference .DELTA..PHI. along a scanning beam light flux. The path length is measured from a light source to a scanning surface in the first hologram, and is represented by .DELTA..PHI.<C(.lambda..sup.2 /D.lambda.) where C is a constant less than 0.5. The path length is related per the above equation to a wavelength, .lambda., at the center of the light source, and a wavelength displacement .DELTA..lambda. measured from the wavelength .lambda. at the center of the light source.

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