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From: ron@topaz.rutgers.edu (Ron Natalie)
Newsgroups: sci.physics,sci.electronics
Subject: Re: reflective light modulator
Message-ID: <12862@topaz.rutgers.edu>
Date: Tue, 23-Jun-87 10:15:47 EDT
Article-I.D.: topaz.12862
Posted: Tue Jun 23 10:15:47 1987
Date-Received: Thu, 25-Jun-87 00:59:48 EDT
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Organization: Rutgers Univ., New Brunswick, N.J.
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Xref: mnetor sci.physics:1755 sci.electronics:843

How about liquid crystals?  Seems like you ought to be able to place
a sheet in front of the corner reflector which would also keep dirt
off the mirrors as well

          LCD-material
                  V
                  |\
Beam              | \
----------------> |  > <- corner reflector
                  | /
                  |/