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UltravioletPhotography

Resonance fluorescence


Pylon

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In most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation; this phenomenon is known as the Stokes shift. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation. The emitted radiation may also be of the same wavelength as the absorbed radiation, termed "resonance fluorescence".[13] - wikipedia

 

If this is true, are there any infrared light sources capable of dumping many many IR photons out all at once onto an object, causing Infrared-Induced Visible Resonance Fluorescence?

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In most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation; this phenomenon is known as the Stokes shift. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation. The emitted radiation may also be of the same wavelength as the absorbed radiation, termed "resonance fluorescence".[13] - wikipedia

 

If this is true, are there any infrared light sources capable of dumping many many IR photons out all at once onto an object, causing Infrared-Induced Visible Resonance Fluorescence?

 

The article is worded poorly. The electron is not absorbing the photons. The energy (photons) is captured by the particle to allow the electron to be transferred to a higher energy state. Its similar to how radio waves induce an A/C current in an antenna, e.g. the radio waves cause the "loose" electrons in the antenna to slosh around. In this case the antenna is the particle and the electron sloshing in a higher energy state.

 

A green laser pointer uses 1064nm light and via a doubling crystal creates 532 nm light so this is an example of "Infrared-Induced Visible Resonance Fluorescence".

 

The probability of higher order frequency multiplying drops off quickly. e.g. 2->1 is easy but 3->1 is harder and 4->1 much harder to do. To even have a chance of doing so you'll need ever more powerful sources of intense coherent IR light.

 

Something like this perhaps:

 

http://laserstars.org/news/MWC349.html

 

And of course a crystal capable of harnessing this intense light without melting or blowing up.

 

However since this is a UV photography forum I feel the need to include some UV content.

 

http://laserstars.org/news/EtaCarinae.html

 

Volia! the ultimate UV light source!

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