Πόλωση φωτός – Πολωτές - Λέιζερ
http://en.wikipedia.org/wiki/Polarizer
http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/video-lectures/lecture-30-polarizers-and-maluss-law/
http://pe2bz.philpem.me.uk/Lights/-%20Laser/Info-902-LaserCourse/c06-10/mod06_10.htm
https://en.wikipedia.org/wiki/%C3%89tienne-Louis_Malus