Natural Science Forum / Physics / Optics / February 2005

If you're an optics person, and have ringing in the ears, this soft laser
treatment information may be of interest.  Particularly for a bio-medical
person who knows about adenosine triphosphate:
http://www.tinnitool.com/wenglisch/

Hey All
Check out this great site that is giving away totally FREE iPods!
No Joke.
It's a completely legitimate offer, and this company has already given away

I'm reading a book on digital photography, and the author talks about the
optical center. For a simple single lens it's in the center of the lens. He
then talks about adding a double convex lens. Now the optical center shifts
somewhere outside the simple lens. What is he really ...

Looks like I am going to get some Spectra Physics T20-8S40 power
supplies with V80-106Q heads.  There isn't much information available
for these on the Newport/Spectra web site, but I'm pretty sure they are
part of the HIPPO series.  Does anyone have any information about these

   I have an old bottle of high-index mounting medium called hyrax.  It
says "Paul M. Ruedrich Formula."  It has solidified.  Does anyone know if it
can be re-constituted, and if so, what it will take?
   Also, does anyone know what the RI is for this material when cured?

Hi All...
I purchased one of these Lightwave Optics 221 DPSS laser systems and
it appears to work fine. The only issue is that I need to pulse the
laser. Is there any method for producing short pulses 20-50ns extra

We are trying to get this laser diode Hitachi  HL6501MG  (30mW) to work
and deliver it's rated output power (35mW at 660nm.
I have an ampere meter in series with the laser diode. We measure up to
around 90mA  (operating current typical is 65mA and max is 95mA). We use

I would like to analyze what happens to the minima and maxima of a
circular aperature at the border between the near field and far field
approximations. As the source and screen are moved closer and closer to
the aperature, what happens to the minima and maxima? I really just

Ht all,
Does anybody have a uniphase single line 488nm head / tube, rated for 20mW
for sale? I need this one as replacement for a dead one of tthose small
rectangular style heads.....

Did some searching and came up without results. For diodes that lase
between 500-600nm what are the current developments?
Thanks
Steve

Intel unveils laser breakthrough
Intel has unveiled research that could mean data is soon being moved
around chips at the speed of light.
Scientists at Intel have overcome a fundamental problem that before now

Dears,
I would like to control the birefringence of a high-birefringence
fibre.
Any apparatus or methods can be used to control the birefringence?

I wish to know availability of instruments that can be used to inspect
pin-holes in metal coated optics with attachment to vary
magnification.

I have read about the "stop shift equation (G-SUM equation)" from the
book "modern optical engineering" by Warren J. Smith. And try to use
it to design the lens. But I found the mathematics is very
complicated and what I can handle now is to design a doublet. I want

I need to find some software to do IR lens design, for example, an
imaging system for an IR camera - any ideas?
TIA
Chris