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Jun 11, 2021 at 5:33 comment added Emilio Pisanty You could have found out four years ago, if you had read my answer on this thread. And you have yet to edit this answer, despite apparently agreeing that it is flawed. Oh well.
Jun 10, 2021 at 21:15 comment added peterh @EmilioPisanty Wow, I checked the green laser thing and it is amazing! I never tought that such complex things are needed only to create a little bit smaller photons.
Jun 10, 2021 at 6:30 comment added Emilio Pisanty (And heck: if the laser pointer is green, then it's actually a frequency-doubled infrared laser, where the frequency doubling is a nonlinear effect. If you actually cared about the physics then that should be more than enough to convince you that the answer needs editing. Not that I expect you to, at this stage, though.)
Jun 10, 2021 at 6:27 comment added Emilio Pisanty I find it pretty hilarious to talk about nonlinear QED (which has been observed in a couple of experiments) and GR effects (thus far unobserved) as "targeting the common sense" (!) while explicitly declining to talk about phenomena with real-world applications. Unless you think that laser pointers in air are subject to the physics you describe in this answer?
Jun 9, 2021 at 19:18 comment added peterh @EmilioPisanty (sorry for the late react) Yes and this non-linearity is heavily used in the industry. But the answer targets the common sense, and in the common sense, laser pointers work in air (very linear) and not in tricky non-linear materials.
Jan 22, 2017 at 14:17 comment added Emilio Pisanty Note that the Maxwell equations are in principle only linear in vacuum; in the presence of a medium there will typically be nonlinear components of the electric and magnetic susceptibilities which are easily accessible to in-the-lab intensities.
Jan 21, 2017 at 17:15 history edited AccidentalFourierTransform CC BY-SA 3.0
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Jan 20, 2017 at 13:01 history edited peterh CC BY-SA 3.0
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Jan 20, 2017 at 12:16 history answered peterh CC BY-SA 3.0