[Laser] Modulation by quartz xtal
Capgi&Co
[email protected]
Mon, 15 Apr 2002 23:13:01 +0200
I think that it woulb be posible to detect the quartz deformaion by
interferometry :
split the Laser beam, one of the sub-beam pass through the quartz waffer,
and is later mix with the second sub-beam. at the mix point, interferrence
fringe should be observe and the shift of the fringe is a measure of the
waffer deformation, but perhaps the shift is to tiny or to fast to be seen.
JMC
----- Original Message -----
From: "James D. Goodwin" <[email protected]>
To: <[email protected]>
Sent: Monday, April 15, 2002 6:16 PM
Subject: [Laser] Modulation by quartz xtal
I was recently given several xtals in glass holders. They are in the 6 and
11 MHz range. A laser beam can be reflected from the quartz element or
passed through the element. It also can be reflected off the metal strips
that hold the xtal wafer.
I have attempted to detect rf modulation on a laser beam passed through an
oscillating xtal. So far - no success. I have swept a wide span of
frequencies in this test.
>From research on the 'net I know that quartz is used to modify laser beams
in several ways. Will the motion of the thin wafer in these oscillating
xtals affect the beam? If so, will the beam be modulated with the exact
frequency of the xtal or some other frequency? I am setting up to test a
xtal that is frequency modulated like those xtals in the early 2-meter rigs.
If a modulated laser beam can be detected, it could be amplified and
multiplied so there would be adequate f.m. swing to produce n.b.f.m. or even
wideband f.m.
Ideas anyone? Detection techniques? It may be that I am trying to invent
the wheel only to find that it is square!
KF4BL
Any help with these questions will be appreciated:
1. Does the vibrating xtal affect the laser beam?
2. If so, what type of modu
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