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Ultraviolet bulb...

Externet

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Hi
An incandescent light bulb; if its filament does not emit ultraviolet radiation, light passes trough its internal vacuum and then trough the glass that can contain tint, minerals, something in it. Can the resulting light be somehow ultraviolet, or contain some ultraviolet light by just passing trough a 'doped' glass ?
In other words, can light change its λ to ultraviolet by passing trough some tailored material ? Would that be similar to diode pumped solid state laser ?
 

betwixt

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You can filter OUT wavelengths but you can't add them in. You can possibly use the light to stimulate UV emission from a coating or substance added to the glass but it won't originate from the filament directly.

Brian.
 

KlausST

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Hi,

There are materials that can emit light of one wavelength when hit by light of another wavelength.

If I'm not mistaken then a neon lamp generates mainly UV light, but the inner coating at the glass tube modifies it to visible light.
So the other way round of what you describe.

Klaus
 

BradtheRad

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1.
I had a 'suntan' bulb which emitted UV light. Incandescent, a few hundred W. After running for a minute or two it got brighter and its color turned slightly bluish, which indicated it began giving off UV light.

2.
'Black light bulbs' are low-cost UV lamps going back to the psychedelic era. Incandescent type. I suppose the filament is ordinary tungsten. The glass has a dark blue coating which passes UV. Some visible light gets through and illuminates the room, although fluorescent colors are brighter due to the UV.

s-l300.jpg
 

D.A.(Tony)Stewart

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You can get UVC LED bulbs cheap with ? 50W in edison style.

FL tubes emit UV and fluorescent dies 2 or tri-phosphor types always produce longer wavelengths , never shorter. Same with White LED's

Tungsten cannot produce UV significantly by any method except when imploding on failure with inert gas, not a vacuum.
 

dick_freebird

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There is some (very little) black body radiation in the UV from a filament bulb. Halogen better than argon bulbs.

The purple coating just makes it look like it could be effective but it isn't, very.

There are frequency doubling nonlinear optical materials (such as back in the day, first green solid state lasers were IR diodes with a doubler slab ).

Today you can get UV LEDs up to UV-C. Big win on lifetime, price at the shorter wavelengths not so much.
 

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