Optical beam scanners for imaging applications
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United States of America Patent
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Jun 29, 1993
Grant Date -
N/A
app pub date -
Mar 30, 1992
filing date -
Mar 30, 1992
priority date (Note) -
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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.
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