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Limit of Focal Spot Size for Lensing EM Radiation Across Frequencies
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[QUOTE="houlahound, post: 5503119, member: 551046"] thanks guys. this is precisely the physics I was looking for. haven't read through it all in detail but am I right in thinking the spot size is purely a function of the hardware transforming the light? in the airy pattern, which is what is caused by diffraction from a circular aperture, would that increase the beam diameter after the aperture ie in general the smaller the aperture will cause greater spreading ie more diffraction. so therefore, if I am thinking right, a smaller beam will be achieved by a transparent lens than an aperture via diffraction. I am going to try link the beam waist formula to the airy disc radius, but not sure if I am messing up the wrong two concepts. [/QUOTE]
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Limit of Focal Spot Size for Lensing EM Radiation Across Frequencies
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