0
$\begingroup$

I heard once that with a special crystal it's possible to "convert" somehow two green photons to a ultraviolet one and that some UV-lasers are based on this fact. Is this right, and even more important: Does anyone have a keyword I can use for some additional research? My (german-language-based) research only led to some similar effects.

$\endgroup$
3
  • 1
    $\begingroup$ I believe so: try searching non-linear upconversion crystal. $\endgroup$ – David Aug 12 '20 at 23:38
  • 1
    $\begingroup$ Thanks!! (It seems to me that the "non-linear" isn't necessary) $\endgroup$ – Ernest Bredar Aug 12 '20 at 23:44
  • 1
    $\begingroup$ The term you are looking for is high harmonic generation $\endgroup$ – Superfast Jellyfish Aug 13 '20 at 6:22
2
$\begingroup$

There is an effect called harmonic generation where two photons of similar wavelength are combined together into a single higher wavelength one in a nonlinear optical crystal.

https://en.wikipedia.org/wiki/Second-harmonic_generation

The effect is used in DPSS 532nm green lasers for converting IR light from an ND:YaG crystal into green light by using passing the IR light into an KTP crystal.

There also exists a process called photon upconversion whereby multiple photons of lesser wavelength are absorbed to produce a photon of shorter wavelength

https://en.wikipedia.org/wiki/Photon_upconversion

As for key-words for research, nonlinear optics, harmonic generation, photon upconversion,

$\endgroup$
1
  • $\begingroup$ Thanks!! This works too! $\endgroup$ – Ernest Bredar Aug 13 '20 at 10:47

Not the answer you're looking for? Browse other questions tagged or ask your own question.