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Why does a laser beam not diffract unless there is a grating in front?

I surmise the focus of your question is the following: If it is assumed that Huygens' Principle in its 17th century form is applicable then any propagation of light should be diverging all over the ...
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1 vote

Why does a laser beam not diffract unless there is a grating in front?

One way in which the propagation of light is viewed says that, unless the light is an eigenmode of the system in which it propagates, it will diffract. In free-space, there are different ways to ...
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1 vote

Why does a laser beam not diffract unless there is a grating in front?

You are right. The opening of the laser should cause diffraction. In fact as Why does a laser beam diverge say, it does. The leading answer says diffraction is a quantum effect, originating in the ...
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1 vote
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Diffraction of photons exhibiting random walking motion

From your link: Once you know, or assume, a typical distance between collisions, you also have to figure out how many steps the photon has to take to travel from the core to the surface. Photons are ...
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1 vote

Intensity of Diffraction and inteferance

We will assume that the distance between centres of slits is several times greater than the width of each slit. The intensity of the interference pattern will then be 'modulated' by that of the ...
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1 vote

Did diffraction bend this light more than 90 degrees?

TL;DR: Yes, it is indeed diffraction, and it's perfectly normal that it reaches all the way backwards. Your general setup is known as the Sommerfeld diffraction problem. It has an analytical solution ...
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