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Recently I smashed a laptop screen and decided to pull it apart to see how it works. Inside are a pair of sheets of plastic called horizontal polarization filters. I found that shining any laser through them creates a wonderful line effect. I was just wondering how this works, and if there are...

Long time lurker first time poster - anyway, I have a ~4v 50mw green laser with a driver from China hooked up to a 9v battery, and the power is stepped down with an adjustable buck converter to prevent the 9v from overpowering the circuit and heating. Anyway the laser runs great for a few...