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http://www.youtube.com/watch?v=lE3F7vjYx4U

References :

http://www.hk-phy.org/articles/laser/laser_e.html
http://en.wikipedia.org/wiki/Laser
http://www.pcmag.com/encyclopedia_term/0,1237,t=laser&i=45928,00.asp
http://www.ehow.com/about_5014443_uses-laser-lights.html
http://www.ehow.com/info_8244093_laser-distance-measuring-tools.html
http://www.thefreedictionary.com/laser