Variable attenuator for dual beams
AssigneeXerox Corporation
InventorsJean M. Guerin, Abd-El-Fattah A. Ibrahim
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Abstract
A variable attenuator for electronically controlling dual beam intensity comprising a laser source for emitting a light beam, a twisted nematic liquid crystal for exposure control of the light beam, a double-sided multi-layer dielectric thin film coated polarization plate for decreasing the s-component of the light beam to less than or equal to 0.0001 of the light beam emitted from the laser source, and a beam splitting crystal for separating said light beam into two beams of equal intensity.
Claims7
A variable attenuator for electronically controlling dual beam intensity comprising
- a laser source for emitting a light beam,
- a liquid crystal for exposure control of said light beam from said laser source,
- polarization means for decreasing the s-polarization component of said light beam from said liquid crystal, and
- beam splitting means for separating said light beam from said polarization means into two beams of equal intensity.
A variable attenuator for electronically controlling dual beam intensity comprising
- a laser source for emitting a light beam,
- a twisted nematic liquid crystal for exposure control of said light beam from said laser source,
- a double-sided multi-layer dielectric thin film coated polarization plate for decreasing the s-polarization component of said light beam from said twisted nematic liquid crystal, to less than or equal to 0.0001 of said light beam emitted from said laser source,
- a Brewster plate and feedback and analyzing means for separating a portion of said light beam from said polarization means to said feedback and analyzing means to control the voltage applied to said twisted nematic liquid crystal, and
- a beam splitting crystal for separating said light beam from said polarization plate into two beams of equal intensity.
Dependencies are inferred from the claim text.