A ABCD matrix formalism for real laser

kelly0303
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Hello! I have an optical setup and a laser producing a gaussian beam and I would like to get the waist of the beam at the end of the setup (i actually want to know what focal length to use for some lenses, such that I get a certain beam waist in the end). Getting the ABCD matrix for my setup is straightforward (I don't need to be super accurate, e.g. I don't account for the lenses thickness), but I am not sure about the initial properties of the beams. For a gaussian beam (which is my case), the 2 parameters that get propagated using ABCD formalism are the waist and the radius of the wavefront of the beam. I have the waist at the beginning of my setup from the laser specifications (they provide waist vs distance from the laser head), but I can't seem to find any information about the wavefront and I am a bit confused about how to obtain that. In their waist vs length plot there is a minimum, can I assume that the wavefront is zero there, or is that not generally the case? Thank you!
 
Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...

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