Copper Chloride (CuCl) and Copper Bromide (CuBr) Laser
http://repairfaq.cis.upenn.edu/sam/laserccb.htm
http://users.tkk.fi/~then/mytexts/lasercontrol.html
This circuit uses a large 1cm X 1cm silicon PIN photo diode and a transimpedance amplifier to measure the light power output of infrared and visible LEDs and laser diodes.
http://www.imagineeringezine.com/PDF-FILES/laserpwr.pdf
long laser circuit includes laser poswer supplies and modulation circuits
http://www.misty.com/~don/lasersam.html
http://www.eio.com/repairfaq/sam/sgld1sch.pdf
http://www.eio.com/repairfaq/sam/laserdps.htm
A low-cost robot laser navigation system based on a PC with application to automatic vaccum cleaners and other indoor navigation tasks.
http://www.geocities.com/progsk/rob/
http://www.aaroncake.net/circuits/lasersup.htm
methods for listening sounds from a window
http://www.williamson-labs.com/laser-mic.htm
capture sounds from vibrating window.
http://www.ews.uiuc.edu/~nshin/PROJECTS/LASERSNOOPER/