John Roberts
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 Oct 20 accepted Would it be possible to build a Solar Panel Etalon? Aug 19 awarded Popular Question Jul 16 comment Would it be possible to build a Solar Panel Etalon? What if you curve the solar panels? Wouldn't you be able to set up a situation where the light could repeatedly bounce between the same two panels then? Jul 15 asked Would it be possible to build a Solar Panel Etalon? Dec 3 awarded Caucus Nov 13 asked Photon Statistics of a Coherent Gaussian Beam Oct 27 revised Bandgap Spacing in Photonic Crystals edited tags Oct 26 asked Bandgap Spacing in Photonic Crystals Oct 26 accepted Rays in Symmetric Resonator Oct 26 accepted Deriving the Poynting Theorem Oct 19 asked Rays in Symmetric Resonator Oct 19 asked Deriving the Poynting Theorem Oct 2 accepted Transmission of Gaussian Beam Through Graded-Index Slab Oct 2 awarded Commentator Oct 2 comment Transmission of Gaussian Beam Through Graded-Index Slab I am new to this concept. Could you briefly show me how this would be done? Oct 2 comment Transmission of Gaussian Beam Through Graded-Index Slab I know that $\frac{-2i}{k W_2^{2}}$ can be expressed in terms of $\alpha, d, W_0, \lambda_0$. However, to get the full width function, I need to express the real part ($\frac{1}{R_2}$) in those terms as well, or get rid of it entirely. Could you please help me with that? Oct 2 comment Transmission of Gaussian Beam Through Graded-Index Slab The beam width function that I get must be a function of d, which means I cannot include $\frac{1}{R_2}$ in it. I then have to express $\frac{1}{R_2}$ in terms of $\alpha$, d, $W_0$, $\lambda_0$, or get rid of entirely. This is the part I'm unsure about. Is it possible that the beam leaves at its waist as well, allowing us to eliminate $\frac{1}{R_2}$? Oct 1 comment Transmission of Gaussian Beam Through Graded-Index Slab Thank you for your reply. Wouldn't it be $q1=-kW_0^{2}/(2i)$ though? And this would just give us an expression for q1, from which we can get an expression for q2. However, we still need to substitute out for q2, and to do this, we need to get the radius of curvature for the beam leaving the slab. I'm still not sure how to do this. Oct 1 comment Width of Gaussian Beam and Refractive Index Looks good. Could you take a look at my other question: physics.stackexchange.com/questions/38730/…, which is related to this one? Oct 1 accepted Width of Gaussian Beam and Refractive Index