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## Main Question or Discussion Point

Hello everyone,

I am an undergraduate student studying lasers. I have hard time to comprehend why does the beam diffract upon leaving the laser, does it have something to do with the wavefront being limited in size? Can you explain why does the following formula exists and how is it derived?

[itex]\Delta\Omega\approx\frac{\lambda^2}{A}≈(\Deltaθ)^2[/itex]

I am an undergraduate student studying lasers. I have hard time to comprehend why does the beam diffract upon leaving the laser, does it have something to do with the wavefront being limited in size? Can you explain why does the following formula exists and how is it derived?

[itex]\Delta\Omega\approx\frac{\lambda^2}{A}≈(\Deltaθ)^2[/itex]