19 Jul
2016
19 Jul
'16
3:15 p.m.
On 19/07/2016 21:46, Mouse wrote:
>> You'd probably know, then - what's the
fastest way to deflect a
>> laser beam? In particular, I'm wondering how practical it might be
>> to take a laser and turn it into a vector display
Turning sharp corners is the hard part with
mechanical
deflectors like mirrors, as it means very high acceleration of the
mechanical parts. I haven't done the math to be sure, but,
until/unless taught otherwise by testing, I'd feel dubious about
clipping the X and Y signal bandwidths at anything lower than ~1MHz.
If you want to experiment, you might try to find the mirror/coil
assemblies from a Pioneer laserdisk player or similar. They consist of
a small mirror mounted on a moving coil so as to turn on one axis
through an angle of some +/-10deg (total 20deg). They're light enough
to respond somewhere in the kHz (maybe 10s of kHz) range if you only
need small deflections, rather than the full 20deg. I've got one here,
but never got round to trying it out.
--
Pete