this post was submitted on 06 Oct 2024
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You can purchase laser pointers with grid diffraction grating right now with zero effort to DIY.
You can purchase house decoration style diffraction gratings which are a larger format but are intensely bright. They are however less portable.
You can follow a thought emporiums instructions on how to create diffraction gratings, which includes the software and the process,
And yes, I already own a 300 milliwatt laser with a diffraction pattern that would work for this.
And these things produce actually perpendicular lines?
They have an incredibly high degree of accuracy. It's the same thing iPhones are using for face ID. And if you needed it to be easier it doesn't have to be straight lines as long as it's dots in known locations