> Depending on laser power, beam spread etc. you might be able to use one
> of the IR laser 'cards' that convert IR light to visible light.  We use
> these for aligning lasers on optical benches. e.g.
>
> http://www.cnilaser.com/infrared%20viewer.htm

I have a device similar to that, made by Kodak, which consists of a 1/2" 
wide strip of FR4 with a gob of some form of epoxy on the end. Pointing a 
device like a TV remote at it makes the epoxy flash in time to the 
transmitted IR. I must find a focused IR source and see if it will make a 
point of light as illustrated on that page.

I cannot remember what the original Kodak product was that caused them to 
make these IR sensors, but a colleague had a bunch of the sensors, and 
handed them around at one stage. 

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