Optical beam scanners for imaging applications

Details Optical beam scanners for imaging applications Optical beam scanners for imaging applications

1992-03-30

1993-06-29

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359220, 359495, 359499, 359569, G02B 518, G02B 530, G02B 2610, G02B 2728

Patent

active

052239560

ABSTRACT:
Laser beam scanners having a polarization sensitive beam deflecting surface (specifically a monofacet nondisc plane diffraction grating (NPDG) monofacet deflector and a dual reflection monofacet polarization sensitive deflector that incorporates a polarizing beam splitter cube) achieve essentially 100% radiometric throughput efficiency while also achieving a scan beam intensity that stays constant over the total range of scan angles by using a circularly polarized incident beam and a quarter-wave retardation plate at the entrance aperture of the scanner assembly so that the quarter-wave plate rotates with the assembly. The quarter-wave plate has its optical axis oriented with respect to the incident beam so that it converts the incident circularly polarized beam into a linearly polarized beam having a polarization direction that maximizes the radiometric throughput efficiency of the scanner assembly. The polarization direction of the converted linearly polarized beam stays constant relative to the deflecting surface, as a result of using the circularly polarized incident beam and the quarter-wave plate which rotates with the deflecting surface.

REFERENCES:
patent: 4779944 (1988-10-01), Ritter et al.
patent: 4852956 (1989-01-01), Kramer
patent: 5009472 (1991-04-01), Morimoto
patent: 5097351 (1992-03-01), Kramer
Kramer, "Holographic Deflector for Graphic Arts Systems," Chapter 5, Optical Scanning, G. F. Marshall, Ed., New York, Marcel Dekker Inc., 1991, pp. 213 and 268 to 273, 306 to 319.

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