Rodrigo Thomas
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 Jan 25 awarded Notable Question Jul 2 awarded Curious Jun 9 awarded Notable Question Apr 26 awarded Nice Question Jan 19 comment Uncertainty on a single observable measurement so, although there is no principle/relation that limits precision, I can conclude that (depending on the state and on the observable measured) the error bar of a real measurerement contains "quantum uncertainty"? Jan 19 asked Uncertainty on a single observable measurement Jun 6 accepted Non reciprocal light propagation May 5 asked Non reciprocal light propagation Mar 3 awarded Nice Question Jan 27 awarded Yearling Dec 24 accepted Counterpropagating beams in a ring cavity lasers Dec 21 comment Counterpropagating beams in a ring cavity lasers I got the answer from ChrisGerig, but I agree with @UrbanRonMaimon that what he answered was not my question. Dec 21 comment Counterpropagating beams in a ring cavity lasers well, among other references, this from "Laser Electronics" by Joseph T. Verdeyen, 3rd Edition, Chapter 7, page 180: "(c) Stimulated Emission: ... Thus, the added photon is at same frequency, at the same phase, in the same polarization, and propagates in the same direction as the wave that induced the atom to undergo this type of transition". Dec 21 comment Counterpropagating beams in a ring cavity lasers from the figure on the question text, what mirror do you think that allow reflections in the oppposite direction of the pump beam? Dec 20 asked Counterpropagating beams in a ring cavity lasers Nov 26 awarded Popular Question Oct 31 awarded Popular Question Jun 21 awarded Tumbleweed Jun 16 comment problem with the last terms of uncertainty principle If you defined $\Delta \hat{A} = \hat{A} - \langle A \rangle$, then yes, the equalities are true... just use the associativity of the sum; the second question it's some kind of something that is not trivial, and I don't if it really has a physical meaning. May 8 awarded Popular Question