Natural Science Forum / Physics / Optics / May 2005

But I came across the term "diffraction order" in literature, and I don't
know what it means.
Does it refer to the areas of diffraction maxima (as in the sin(x)/x
Fraunhoffer pattern)?  As in the large central maxima would be zeroth order,

After years of not having lab-space, it looks like I might have space again
soon. I'm guessing that most of my holography equipment is hopelessly
outdated (early 90's) and I want to start from scratch.
So, if one were to start up a lab and had a couple of thousand dollars to

I have a qty of Zerodur blanks available. Any interest?

I am looking for an optical filter for a flourescence experiment. The
excitation wavelength is 365nm, and the emission wavelengths are
between 400 and 500nm. I would like to find a filter for the receving
optics which blocks 365nm (less than .01% transmission) and passes

Dear all, I have 12 laser machines need to repair the laser head.
The brand of laser head is CEO. And the power is 50W. Now the output is
not strong as before. So I need to repair it. Who can teel me where I
can fix it and the price?

Hello, guys,
I'm not sure if this is the right place to ask, so forgive me if I'm
offtopic.
I've been studying media access control (MAC) protocols for wavelength

Does anyone know of a source of small, very light weight plastic lenses?
Particularly plano-concave lenses? Thanks.
Ron
--

Two very old B&L units 60,s era . don't really want to destroy so will sell
to good home $200.00 ea.
----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups

I'd like to ask your opinion about something I've seen
using a program simulating a standing wave resonator.
Aparently when length goes down under a certain limit,
suddenly the beam diameter in the cavity drops down

I'm looking for large aspheric lenses with a diameter of 200 mm.
If you know someone capable of doing it.
SV.

So I have video camera that works well with light but when there is
close to zero to no light the image is dark (figure that).
I want to know if I can put some type of light/emitter that is invisible
to the human eye but the camara can use to see the dark area?

I just bought a Digital Blue from Dick Smiths. It seems to me more for kids
than to be taken seriously (I should have reaklized this since it was by the
mecanno).
I just wanted something to photograph the two spotted mites etc on the

would someone please explain why the innermost visible color ring of a
sundog is red while that of a rainbow is violet?  The only consistancy I can
think of is that the ring closest to the sun has the longest wavelengths.
thanks

Sam Goldwasser asked me to provide more details on the Varo Cr:Er:Glass
eyesafe laser range-finder, so I decided to visit IMO Varo's offices in
Garland to see if I could beg, borrow, steal or otherwise acquire some
documentation on it from them. It had been a few years since I last

I want to built an LCD projector by myself.
Does anybody know where can i buy the LCD panel which is used to
mudulate the light beam with images?
Thank you!