A Conversation for How a Laser Works

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Post 1

Big Geordie

Could I ask a small related but different question? smiley - smiley

What is Black Light? and how is it manufactured?

I have used black light boxes before but know nothing about them.


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Post 2

Dr Hell

Uh.. You mean that light effect seen in many party halls? Where white stuff starts glowing?

Weird, isn't it?

It's UV-Radiation, well or at least deep blue radiation. Humans cannot detect this kind of light with the eyes very well, so therefore we don't SEE the light very well. That's why we call it 'black' light.

Many objects are stained with dyes to make them appear in the colour they should appear under normal illumination (for example the white letters on a black t-shirt). These dyes start shining brighter when they are exposed to UV radiation (technically one speaks of fluorescence), and therefore one has the impression that some colours are glowing.

At least I think this was the explanation.

HELL


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Post 3

Big Geordie

Thank you very much. It has answered something I have always wondered about.

I have a theory that if we could manufacture a system of absorbing light would this create a black hole? smiley - smiley


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Post 4

Dr Hell

If the system would be very (very) heavy yes. Otherwise no.

Bye,

HELL


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