A couple of links:<p><a href="http://www.williamson-labs.com/laser-mic.htm" rel="nofollow">http://www.williamson-labs.com/laser-mic.htm</a><p><a href="http://lifehacker.com/software/diy/build-a-laser-spy-microphone-on-the-cheap-292718.php" rel="nofollow">http://lifehacker.com/software/diy/build-a-laser-spy-microph...</a>