On Thu, 2007-04-05 at 14:16 +0100, Howard Winter wrote:
> Alan,
> 
> On Mon, 2 Apr 2007 11:07:31 -0700 (PDT), alan smith wrote:
> 
> > Evans & Sutherland was building a laser projector, both military simulations and commercial movie houses 
> applications.  Not sure what ever came of it since the groups split off and were sold.
> 
> Thinking about this:  aren't lasers inherently monochromatic?  If so, they would make really poor colour projectors 
> unless you use a three-gun approach with each being pure red, green blue.

That's exactly what they're doing these days. Three lasers pointed at a
DLP chip. Reason for the push is the "rainbow" effect due to the single
light source and colour wheel used in current DLP sets.

It used to be hard to get solid state lasers of colours other then IR
and RED, but thanks to the push from optical media (DVD uses red,
HDDVD/BluRAY use blue, I've seen lots of green lasers but I don't know
of a commercial app that uses them) it's gotten much more common.

TTYL

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