Natural Science Forum / Physics / Optics / December 2004

I am an independent producer in North Texas, and I am currently
working on a documentary looking at the history, current uses, and
potential future uses of lasers. This documentary, which I hope to
market to PBS or a science-related cable channel, will also include

I'm in need of a stand set of z-stack images to test my volume
rendering algorithm.  I'm sure there must be standard set of images /
test image sequences available for building volumes.  I spent quite
sometime in googling, but didn't find a good set of images.  If anyone

I just bought a Zeiss ICM 405 off Ebay. Listed "sold as seen" by a
vendor who "knows nothing about microscopes" meant it was a big risk.
But after asking several questions, I decided break-up value would
recoup some loss if it turned out a real lemon and took the plunge.

Happy New Year!
Gregor
For the lovers of Diatoms with a high bandwidth, here is one of my favorite
slides made by the Diatom expert Klaus Kemp:

I want to reduce noise in my fiber laser. The RIN is around -85dB/Hz
and i want to reduce it. I have read about negative feedback loop to
reduce noise. What i didn't understand in that is how do we determine
how much light to split to put it in the splitter. I mean whether to

For the first time ever, UV dominated optical spectrum was detected
from solid X-ray fluorescent (XRF) sources present as salts (AMC
2084,UK).
http://www.geocities.com/raomap/discovery1.html

Is it possible to buy a scale to put on the slide in order to measure the
image? My eyepieces don't look as if they will support a reticle. I suppose
the problem with putting a scale on the slide might be that at high
magnification the scale and the object won't be in focus at ...

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3863518221
We've got several of these available.  I checked them out using an
SDL-820 driver and they produce rated power at well under the 3.1A rated
current and are about 810nm @ 20C.  I believe these are the pump diode

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3863731520
In case you have questiones, please send to
kds315 at yahoo dot com
thanks,

While a light bulb filament is powered, the glass bulb is very hot. I
would expect very little heat transfer from the filament to the glass
through the small amount of gas within the bulb. Is the glass heating
due to absorption of infrared?

I've been trying to find any sort of microbes in samples of lake
water. I've taken samples from the water surface, the muddy bottom,
and floating plants. I've seen a grand total of two single celled
animals.

Dear All:
It's the end of the year and all, and since we apparently have
absolutely nothing of interest to talk about these days--troll-feeding
frenzies apart--I'd like to know what your favourite pretty optical or

I am writing a forward ray tracer to model dispersion, now in a prism,
later in diamonds.  For the moment I use a triangle with refraction angle
of 60 degrees (I work in 2D now) and I work in Java
I want to know if my setup is correct, because I get a strange effect.

I wonder if any of you are familiar with this microscope, which I've just
bought on ebay. The guy who sold me it doesn't seem to want to answer my his
emails - can't blame him I suppose.
It's made by Prior. It has two eyepiece lenses, x6 & x10; and three object

Could you please suggest me some famous brands of scietific CCD
camera. I want by one as a detector for fluorescence system. Thank
you for reply.
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