Natural Science Forum / Physics / Optics / September 2007

if i have good memory, you've asked for the rest of PS3 unit when i take
diode out...

I'm trying to do an experiment which involves detecting a small
(~10^-6) modulation of a laser beam, at a frequency of about 60KHz.
The beam is about 1mW, and is itself chopped at about 35KHz.
I am currently using an unamplified photodiode and a lockin amplifier

Suppose I have a polarized laser, where I don't know in advance what
that polarization is. Might be linear in any orientation or might be
elliptical in any orientation or might be circular.
Further, this laser is reflected by several mirrors, incident at 45

I am looking for a laser that lays down a line (slit beam?).
It has to project about 30-40 feet and be 12 volt (as in automotive
use). It needs to be visible in daylight. Where do I find a supplier?
If the project goes well I will need a wholesale supplier. Any help

I've just happened upon the opportunity to put my massive dept that I
owe to my landlord (11 grand) and my rent on hold for a month whilst I
blow (I say blow but I really mean frantically willingly hand over )
my months wages on laser.  He's seen that I am struggling to cope with

Hi everybody! I'm new here.My name is Julian and I'm from Germany. A
few weeks ago I bought me an Argon Ion Laser Power Supply (Cyonics
Model 2101-65MLA). Now I want to repair it for a project on my
university, but there is a little problem. Everything is ok, but on

I have some GIF images of pages from a service manual for the
LM22SDA galvo driver on my website.
http://www.skywise711.com/lasers/scanner/scanner.html
I am having problems with someone in email who says they

Build a laser from an old washing up liquid bottle.
http://bob.bob.bofh.org/~robm/manual/DIY-LASER.html

This is an intriguing quantum measurement paradox, and I don't
know how to resolve it: In a Mach-Zehnder interferometer, insert a gray
filter G into leg L2.  Given a traditional stream of light, that alters the
amplitudes delivered to the beam-splitter/recombiner R.  With a 25%

Big Bertha Thing positron
Cosmic Ray Series
Possible Real World System Constructs
http://web.onetel.com/~tonylance/positron.html

I'm looking for my first microscope, which will be a stereo
microscope. I''ve searched among major brands (Nikon, Olympus, Leica,
Zeiss...) and the only one that fit my budget (around 1000$) is the
Leica EZ4. Having looked at brochures, this microscope seems to be a

Is there a knowledgable expert out there that can help a new beginner
in replacing the missing objectives on a Reichert Microstar IV. I have
been having loads of trouble sourcing the objectives that I want and
was hoping that there is an equivilant to the Reichert made by either

Okay, I have a low budget, but I'm looking for a way to get reasonable looking
photos of individual chondrules in meteorites into my PC.  I'm looking at a
model of USB hand-held microscope.  I know that I won't get anything approaching
professional level results from this-- but I'm ...

i found a nice site here
http://protist.i.hosei.ac.jp/Protist_menuE.html

Can you make BLACK beams....of light, Contradiction in terms maybe.
Do I get any points for stupidity?