steven.alan.canning at verizon.net
Mon Mar 23 12:59:22 CDT 2009
As stated below, a Solid State LASER ( yes it's all CAPS because it is an
acronym ) has tons of bandwidth. New standards are coming out for 100
Gigabit Ethernet. For the younger folks here are some fun facts you need to
know. You can't use a cheapo hand-held LASER pointer for this type of
project because the beam is not constant, it is turned on and off to make
the batteries last longer and the LASER run cooler. Your display would have
"holes" in it when the beam is off. Also as Ethan states below, you need a
front-surface mirror to deflect your beam. With a front-surface mirror ( as
the name implies ) the reflective surface is on the front of the glass. On a
regular mirror it is on the back which will cause you no end of problems due
to the index of refraction through the glass ( that's how a prism works ).
Modulating the beam is the tough part, usually easiest just to turn it on
Best regards, Steven
> On Mon, Mar 23, 2009 at 2:47 AM, Alexis <thrashbarg at kaput.homeunix.org>
> > Yes, but the bandwidth of an LED laser is still pretty high. There are a
> > laser projectors on the net, but this one goes into the detail of making
> > own galvos.
> I almost made a laser projector last year, but I was having problems
> sourcing mirror material at the South Pole. One thought was gutting a
> laser printer or a copier (ISTR there's a front-surface mirror in
> there somewhere that's as wide as the paper path), but there was
> nothing suitable scrapped while I was down there. Now that I'm home,
> I'm keeping an eye out for a cheap/free printer to scavenge. I
> already have the semiconductor laser, naturally - the grocery store
> was selling laser levels for less than the cost of lunch.
> If anyone gets far deep enough into the idea of a laser projector to
> start making galvanometer servos and wants to trade parts, let me
> know. As I said, I can do the electronic bits and assembly but need
> help with the shaping of the core parts.
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