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Should the processes under "related processes" be listed here at all? I'm not completely sure about Raman. I believe that the Raman-shifted "fluorescence" intensity is linear in excitation intensity, on the other hand it is a chi3 process. Stimulated Raman is of course a different story.
Would anyone (DrBob?) care to write a few words about phase conjugation? -- Hankwang 09:40, 4 Mar 2004 (UTC)
I'm having a little trouble figuring out exactly how FWM should fit into this article. As far as I know, FWM is an umbrella term which describes all of the chi(3) processes where one can distinguish, either by frequency or wavenumber, the four E-fields involved. Degenerate four-wave mixing is a term which can be applied whenever two or more of the fields have the same frequency or wavenumber. Some of the DFWM processes have their own names and some, like third harmonic generation, are almost never referred to as DFWM, even though they technically are. Is all of this correct?
I checked the Wikipedia FWM article and it seems to primarily focus on FWM in fiber optic communications. Also, it seems that FWM is re-derived in many places; at very least in this article under phase conjugation and in the Kerr effect article - and it isn't derived in the one place it should be: the four-wave mixing article.
After I found this I think that an expansion of the (E1+E2+E3)^2 can be done in the FWM article and the different classes of term related to their respective physical processes (like SPM, XPM, THG, etc.) Then articles on these processes and applications (like phase conjugation) can just link back to the FWM page. Does this sound OK? - FGS
Rpaschotta moved Brillouin and Raman scattering from "related processes". Nonlinearity w.r.t. the light intensity suggests that the Raman- or Brillouin-shifted peak would increase disproportionally with increasing laser intensity. AFAIK that is not what happens in typical applications. I graduated on a project involving Brillouin scattering on GHz phonons and did a PhD in time-resolved spectroscopy and it is not obvious to me, so maybe it's a good idea if Rpaschotta wrote a few words about why it classifies as nonlinear spectroscopy.
Han-Kwang (talk) 14:08, 25 Oct 2004 (UTC)
Ok, here are some remarks. Of course, the Brillouin shift doesn't depend on intensity. Nevertheless, the interaction is nonlinear in the involved optical fields. Consider e.g. two beams interacting in a Raman-active medium. Now reduce both powers by a factor of ten. The result will NOT just lead to ten times lower output intensities of both beams. Instead, the interaction will become weaker. This is clearly different to the case of an electro-optic modulator, where the optical output depends linearly on the optical input (within certain bounds, of course).
RPaschotta 12:05, 30 Oct 2004 (UTC)
Hmm, I see what you mean. But along the same lines you could defend that Beer-law absorption is a nonlinear process because in a pump-probe experiment the signal depends on both the pump pulse and the probe pulse. Unless you talk about specific applications, both Brillouin and Raman spectroscopy only involve one optical field, on which the signal depends linearly.
Han-Kwang (talk) 15:58, 30 Oct 2004 (UTC)
Why do scientists use the stupid phrase "with respect to" (which they must acronymise to w.r.t. or wrt) instead of "about" or "from"? lysdexia 01:10, 21 Dec 2004 (UTC)
Could please someone in the know add a section explaining the phenomenon from the quantum standpoint, i.e. some lower-energy photons come in, some (lower number) of higher energy photons come out. Explain the effect that produces these higher energy photons.
I am curious myself, and I believe that it would be a generally valuable addition. Thanks! =ec 195.212.29.188 ( talk) 10:14, 15 February 2011 (UTC)
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I noticed the removal of a See also for lasers, which is probably right. But then I considered that one for phase conjugate optics might be included, but there is no such page! Should there be a page for phase conjugate optics? It seems to me that it is important enough to have its own page, not just a section in this page. (Not that I feel qualified to write one.) Gah4 ( talk) 21:23, 15 November 2016 (UTC)
Hi folks, I'm not sure if the very last line of this calculation is correct:
According to my calculations, there is a factor of 2 missing in front of : — Preceding
unsigned comment added by
92.208.178.25 (
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19:14, 13 December 2017 (UTC)
Hi all,
Are there any attempts to write an article about difference frequency generation (DFG)? DFG is the only process in the list of Frequency mixing processes that does not have its own page. As other pages mention DFG (e.g. Frequency comb), I thought it would be nice to have an extra page for DFG. I might be able to contribute, but before I start something new, I wanted to check if there is a reason that this page is not existing so far. Anyone who can answer this? Thank you! Kuridhika ( talk) 10:19, 14 November 2022 (UTC)