[Laser] Off the wall thought...

[Charles R. Patton]

Thoughts:
1) Years ago, Kodak had a plastic film coated with a material that could 
be "charged" with visible light.  Then when IR light was shined on it, 
it would glow in the visible region.  I don't know how fast the response 
was, but I'm sure it was fast, just not necessarily sensitive.
2) There were plates coated with a thermal barrier coating and then a 
fluorescing powder.  A UV light would then be used to light them up.  
When hit by IR, the powder coating would heat up, and the powder would 
go dark.  The thermal barrier was varied so that it took different 
amounts of power to cause them to darken.  These were slow response, but 
very useful for tuning up  CO2 lasers I built.
Chas  K6PIP

wThe On 12/16/2014 9:11 PM, KD7JYK DM09 wrote:
> Is there a filter material, something along the lines of thin glass or
> plastic, that can convert IR into the visible spectrum?  For example, hold
> up a filter in front of an IR LED remote control and see the pulses of
> light?  More importantly, would such a thing be fairly inexpensive?
>
> Kut
>
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