3 ms·
> Surely light without pauses has way more ability to send two photons one after another than light with pauses. No it's the opposite, SHG[1] requires huge spa
by 4ad 3y ago
> Surely light without pauses has way more ability to send two photons one after another than light with pauses.
No it's the opposite, SHG[1] requires huge spatial energy density which also means huge temporal density (power). A continuous wave of the required power would obliterate your retina (and your head).
[1] https://en.wikipedia.org/wiki/Second-harmonic_generation https://en.wikipedia.org/wiki/Second-harmonic_generation
- z2h-a6n 3y agoIt's not discussed in the linked article, but the paper it's based on argues against second harmonic generation and in favor of a two photon absorbtion process [1]. I'm not enough of an expert to comment on the rest of what you said, but I think I agree (based on skimming the paper) that the process still requires a high photon flux (i.e. high power desity). [1]: https://www.pnas.org/doi/full/10.1073/pnas.1410162111 https://www.pnas.org/doi/full/10.1073/pnas.1410162111 ; See second paragraph, and/or search the text for "SHG".