Natural Science Forum / Physics / Optics / April 2008

Asking $4000
Spectra Physics 2011 head
2454 power supply (has rs232)
controller + ribbon

I am trying to model an optical system for fingerprint recognition in
OSLO.
How it works:
The finger is put on the top surface of a glass cuboid, which is

I bought a surplus He-Ne laser for five bucks then put it away. It's
now been two years or more since I last used it. I'm wondering if
there's a "shelf-life" for  gas laser tubes?
Ron

http://moonvertising.com
Saw this first on photonlexicon.
Rolling Rock beer is going to use a green laser to display text on the
moon.  I don't see how this is possible...

Dear Lena fans:
Your long wait is over: As you have no doubt been anticipating eagerly,
Monday, March 31 is Lena Sjooblom's birthday.  Lena is the 1972 Playboy
model whose face and feathered hat (only) have graced hundreds of image

I had always assumed this was exactly 0.5 mm with 19 emitters on a 1 cm bar.
But someone emailed saying they had measure something very slightly
shorter or longer, just enough to make the fiber combiner unusable
with a replacement diode (not from MG).

I'm a coin collector and would like to buy a stereo microscope to
grade coins that I buy and sell.
What are some models to look at? What kind of magnification would I
need to see a full-field view of a U.S. silver dollar?

March 29, 2008 10:37pm
SIX planes had to alter their flight paths into Sydney airport after
pilots were targeted in an unprecedented laser "cluster attack',
authorities say.