Excimer KrF krypton fluoride 248nm laser color?

[supermario680]

Might be a dumb question but..... Is it just me? I can't see to find any reference to their color... I see it at work.. But i thought we could only see from about 390-700nm?

 

[SerpantSlayer]

248nm would be ultraviolet and invisible to the human eye.

 

[mojo_1234]

what you see might be some fluorescence effects (like the fluorescence of a 405nm BlueRay or N2 laser on a piece of white paper).

 

[Pi R Squared]

Visible range is about 400-800nm for most people, this will vary some from person to person but not a huge amount, 248nm is way beyond visible, as SerpenySlayer said that is well into UV.

Alan

 

[supermario680]

248nm would be ultraviolet and invisible to the human eye.

Visible range is about 400-800nm for most people, this will vary some from person to person but not a huge amount, 248nm is way beyond visible, as SerpenySlayer said that is well into UV.

Alan

Which is why I was confused since I see a brilliant blue coming from it...

what you see might be some fluorescence effects (like the fluorescence of a 405nm BlueRay or N2 laser on a piece of white paper).

the must be the answer... it sure is a beautiful brilliant blue...

IMG 3264 - YouTube

 

[Cyparagon]

Most of that will be light from the electrical discharge itself - waste light that is not part of the laser beam.

 

[Meatball]

I've had hands on and "hands in" experience on a large KrF. At 248nm, lenses AR coated and mirrors AT coated for it still show 'some' fluorescence. The 800 mJ pulses ensures any imperfections on the optic, and any dopants in the optic break down or fluoresce with a deep violet color.

There's a lot of energy per photon in these beams, and when these photons strike materials, more interesting things are able to happen.

It is my understanding that visible blue light that lands on the optics is non-coherent discharge emission, and violet light on the optics is fluorescence.

 

[supermario680]

I've had hands on and "hands in" experience on a large KrF. At 248nm, lenses AR coated and mirrors AT coated for it still show 'some' fluorescence. The 800 mJ pulses ensures any imperfections on the optic, and any dopants in the optic break down or fluoresce with a deep violet color.

There's a lot of energy per photon in these beams, and when these photons strike materials, more interesting things are able to happen.

It is my understanding that visible blue light that lands on the optics is non-coherent discharge emission, and violet light on the optics is fluorescence.

ah I see, and yes that sounds a little more my language. Fascinating machines.