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I realize that SHG is just frequency doubling, but how? Specifically, I've been told by my professor that when two beams meet at a pinhole in our optics setup and are in phase, that we will be able to see blue light? Is this due to wavelength? Points for keeping the explanation simple.

We're working with a Ti:Sapphire Laser pulsed at 80MHz. Our setup in a nutshell is having the main beam separated into a main beam that will excite the sample of XYZ head on, and a probing beam that will hit the sample at some angle, and be reflected off and into a prism that will separate the...

I need a material I can use to make the walls of a dark room. Something that won't allow much (if any) light in, and also will be safe to use if the laser, 3 watt 800nm wavelength, accidentally hits it. Price should have some bearing too. I was thinking some type of flat, dull fabric that I can...

I need to build a darkroom for our lab's experiment. We're using a 15 watt pump and will probably be around 3 watts coming out hitting the sample. Our primary wavelengths will be around 800nm and 400nm. We need to light the room housing the experiment with a light source that will not interfere...