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BobH1357
super member
Reged: 01/15/05
Posts: 161
Loc: San Jose, CA
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Re: It works! - CaK fluorescent eyepeice..
05/03/06 04:19 AM
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I did a little experiment today with the GG-420 glass. I passed a beam of sunlight through a narrow band interference filter at 404.7nm, which was tilted slightly to decrease the wavelength a bit further toward the 393nm Ca-K line. The room was as dark as I could make it, which wasn't very dark.
I then held a piece of the GG-420 glass behind the tilted filter, and could easily see the fluorescence. When I passed my finger through the beam in front of the filter, I could easily see the shadow image on the glass when looking at it from off to the side. The glow of the shadow image was yellow-green, and I know it wasn't scatter from surface contamination because the glass was very clean on both sides.
I don't know the intensity of the prime focus image in a Ca-K filtered telescope. There may be enough fluorescence to make a difference with this glass, and there certainly may be other glasses that will fluoresce more efficiently at 393nm. Perhaps GG-495?
I think this glass is yellow because it absorbs the UV and fluoresces in that color. My use of it was initially as a UV absorber, and the fluorescence turned out to be great for use as a transmissive focusing screen for little characters, about 80 microns wide, which I view through a microscope.
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