11 Apr
2009
11 Apr
'09
10:03 a.m.
I beg to differ. There is nothing that would preclude mounting say six long
skinny front surface mirrors into a hex configuration ( as viewed from the
side ) onto a motor shaft and spinning it pretty damn fast ( below such
point that it would fly apart ). I've seen a variation of this theme used in
some of the UPC scanners, but those have no need to spin fast.
Best regards, Steven
----- Original Message -----
From: "der Mouse" <mouse at Rodents-Montreal.ORG>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Monday, March 23, 2009 1:28 PM
Subject: Re: laser scope
The bandwidth
of modulating the intensity might well be high, but the
deflection bandwidth is going to be pretty low. You cna deflect an
electron mean at freqeuncies of many megahertz, which is going to be
'interesting' to acheive using mechanically moved mirrors.
Yes, but mechanically moved mirrors aren't the only option for beam
deflection. I seem to recall reading of a crystal whose index of
refraction could be changed electrically. A wedge of such a substance
could serve as a beam-deflecting element; I don't know how fast it
responds, but I'm fairly sure it's substantially faster than
mechanically moving a mirror.