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Optics is the study of light, and its interaction with matter. It includes topics such as imaging systems, fiber optics, lasers, quantum optics, and more.

6
votes
While most lasers generate Gaussian beams, for reasons well outlined by Massimo Ortolano in his answer, this is not the only possibility. Other two kinds of laser profiles that have applications in op …
answered Sep 7 '16 by glS
1
vote
As Chris Mueller pointed out, plane waves can simply be regarded as caused by a given distribution of point sources. As to why point sources should form spherical waves, you can maybe think of it as …
answered Sep 3 '14 by glS
15
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What is it? From Mark Fox's Quantum Optics, an introduction, p.111: The second-order correlation function $g^{(2)}(\tau)$ is the intensity analogue of the first-order correlation function $g^{(1 … intensity fluctuations.In classical optics texts, $g^{(2)}(\tau)$ is often called the degree of second-order coherence. Note that here and in the following we are referring to the degree of second-order …
answered Oct 11 '14 by glS