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Can someone explain how beam divergence works?

Mr. Q

New member
Joined
Apr 14, 2020
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4
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I don't understand why it's so hard to make parallel beams for laser pointers. If you can refract light any way you want, couldn't you adapt a lens' surface according to its input to point every incoming photon straight out?
 



Joined
Apr 2, 2020
Messages
39
Points
18
No. The short answer is quantum physics (specifically the principles of diffraction) prohibits this.

Here's the longer answer
Gaahhhhh darn it Cyparagon, you had to go and link to the VERY document I was going to reference while writing out an over-long explanation. I really need to get better at beating you to posts when I’ve had a bourbon and I’m feeling wordy.
 




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