Re: [DIYbio] Could we use optical heterodyning to boost UV bands into VIS?

On 06/12/2017 08:15 PM, Nathan McCorkle wrote:
> Hmm, I am still thinking about this sort of thing, and just came across an article that seems to confirm that this sort of
> technique works/exists... but for some reason (dogma/history/technical-language-barriers??? or something else I'm failing to
> understand) they don't call it optical heterodyning, but rather 'sum frequency generation':


If you start with UV it could be a down-convert to visible, if you had a difference detector for light, (in radio tech talk).
Heterodyning is about a signal difference, not an addition.

The wikipedia sum-frequency article says the third light beam is tiny amplitude and the sum of the two input light beam
frequencies because of surface effects.

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