You won't, of course, be able to switch the LASER on and off that fast.
I assume you mean you are looking for a liquid-crystal shutter that can
be used to block/ transmit the beam?

What speed do you wish to communicate at?  What (approx.) will be the beam
intensity
to me modulated by the LCD shutter?  Just curious, what are you building?

-todd.


>> the most restrictive, since the potential for eye damage is great.  However,
>> visible lasers are allowed about 10 times as much power.  So the place to
>> start would be with a laser pointer or similar device.
>
>Do you know of any such devices that can be used for this purpose?
>It has to be possible to switch them on and off repeatedly very fast
>since the only easily usable modulation is (so far as I know)
>amplitude modulation (ie. two states, on and off).

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