Laser Beam Width Test - Search Videos

How Do You Measure the Width of a Laser Beam?, PHYS 382

I did a little experiment to measure the profile of a collimated laser beam. Turns out that a laser beam is a lot narrower than it looks. When it hits a wall or other surface, diffuse reflection makes it seem wider than it really is. Perhaps you don't have access to a CMOS profiler ( e.g. https://www.gentec-eo.com/laser-beam-diagnostics) but ...

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