John Roberts
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 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? 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? Sep 30 comment Help With Difficult Deductive Proof They are functions. I will make that more clear. Thanks Sep 22 comment Pulsed Spherical Wave Thanks for the answer. I'm just a bit confused by your very last step. How does the cancellation of the U(r,t) function by the operator prove what we set out to prove? Sep 21 comment Misaligned Mirror on Michelson Inferometer As far as the shape goes, I think that instead of circular fringes, straight parallel fringes will be observed, with separations determined by the angle of tilt of the mirrors. However, I'm still not too clear on the exact nature of that separation effect in regards to the independent movement of each mirror. Sep 21 comment Misaligned Mirror on Michelson Inferometer Thanks. What do you think would happen to this new pattern if the other mirror was to move as well?