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I need polarised beam splitter for red laser, where can I get it cheap, I was thinking about harvesting CDRW or maybe DVDRW, anyone knows if this would work?

qumefox, so then this type of microphone described on FIG 3 is only going to work as I suspected when directly perpendicular to the plane of glass, but this seems impossible to achieve in real life, to find the angle while being far away from the window will be extremely difficult. Anyway this...

Hi guys, I am thinking about building a laser microphone and found quite a bit of sites and videos on google about it but most of them are the angular solutions there is also this bounce back solution with beam splitter look here Fig 3. I have a question about the beam bouncing, on the diagram...