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From: wam@cdx39.UUCP
Newsgroups: sci.electronics,sci.physics
Subject: Re: Laser eavesdropping
Message-ID: <696@cdx39.UUCP>
Date: Thu, 2-Apr-87 15:43:25 EST
Article-I.D.: cdx39.696
Posted: Thu Apr  2 15:43:25 1987
Date-Received: Sun, 5-Apr-87 01:23:32 EST
References: <499@sw1e.UUCP> <15260@onfcanim.UUCP> <2628@phri.UUCP>
Organization: Codex Corp, a division of Motorola; Canton, MA, USA
Lines: 7
Keywords: modulation (beam deflects as window rotates)
Xref: utgpu sci.electronics:454 sci.physics:1026
Summary: methinks he assumes too much

[discussion of detecting beam through tapered slit]
 Trouble is, you need to find the orientation of the axis of rotation
of the bit of window you are illuminating.  Note that this axis may
depend on vibrational modes of the window...

Perhaps if you decoded the Lissajous figure that came back to a 2-dimensional
detector array....