Natural Science Forum / Physics / Optics / November 2004

We've been doing pretty well at remembering not to feed the trolls lately.
Let's not scumb--I mean succumb--to the temptation.
Cheers,
Phil Hobbs

Hi, I`m studying the  behaviour of nanosilica particles in organic
resin(in particular epoxy resin)and I`d like to see the structure of
the nanocomposite before the curing process!!I have some difficulty
observing the sample with transmission electron microscopy

I bought this and it was sent in it's original box that stated "very
low output" in small writing. I got my money back and returned but it
looks like he's now out to con someone.
Pete

if convergent lens do the opposite of divergent lens, how can
telescopes with convergent lens and telescopes with divergent lens do
the same work enlarging images?
   Why if I hold binoculars in the mistaken direction I see the

   I have a CCD with a 1/2" chip with a C-mount adapter. Connected to the
top port of a Zeiss200 I get an image corresponding to only a fraction of
the field of view. Any suggestion in order to collect the complete field of
view?

Innoengineer is an innovative problem solver in  engineering.
Innoengineer doesn't charge a fee for subscribers. Innoengineer allows
registered users to post their complex engineering problems and seek
solutions from our pool of specialized professional engineers.

I just saw an article in "Opto & Laser Europe", November
2004 issue, page 14. Here is a short extract of it:
****
... A technology called silicate bonding, pioneered by

We are looking for the optical fiber can deliver more than 2~5kW of CW
Nd:YAG laser power (1064nm)
We already know the company "Optoskand" and please let us know other
company.

         has anybody had any dealings with the seller afeudale?
He is selling dpss lasers from 40 to 300mW
I did a search of the group and seemingly there have been some issues in the past.
So is he legitimate or not? I would rather ask than make a costly mistake!

I know nothing about lasers but they may be my only solution to a
production problem I have ran into with a product I'm desperately trying to
mass-produce.  I would like to send some photos to help explain.  Anyhow, I
need a laser to cut and weld/seal 2 sheets of poystyrene that are ...

If we take the picture of a point source (obtained by passing
monochromatic light through a 100um pinhole) with a camera (let's say with
a 105mm lens with aperture f/2.8) focused on the pinhole, can the image of
the source be the same as the diameter of the pinhole or does the

What would you choose?

Hi guys,
I have a laser tube that I'm trying to find some information about.
The box is marked "Sony A-6491-014-A", and the laser is stamped
"Toshiba He Ne Laser".  

Hello! excuse me for my bad english I'm french:
I'm student in ingenieur school in france, and I do a project about
optical fiber. On my project I have to caculate the electric field in
an optical fiber, it is what I did whith Matlab, in a single case, I

Any suggestions to remove scratches from a TV screen (not the CRT)? A friend must
have transported her TV with the face on something mildly abrasive, and it created a
spot a few inches square on the screen.