Natural Science Forum / Physics / Optics / March 2008

I'm just trying to make sure I understand the whole laser power thing:
If I have a 1 mW laser with a 1 mm (area) spot on a surface, then the
surface would be said to be receiving 1 Watt per square meter, right?
And if I have the same beam focused down to a 1 micrometer spot, then ...

One Udet Pinckert has been picked up by the FBI for aircraft
illuminations in El PAso.
Had himself a CLASS IIIB Handheld  GREENIE. He's lookin at 20 years!
One more reaons pointers over IIIA shoudl not be imported.

Just a heads up, and warning about an ebay seller!
This is the 4th time i've received totally usless junk or been screwed
by this seller!
The first time was a yag laser brick that had a broken rod end along

Hi Would anyone know if it is true ,that old projecting lenses allow
more UV to pass thru the glass then modern ones?
--- Just a rumor I heard ; I guess surface mirrors are the best way to
project UV light is that true, or can old projecting optics be used

My post on Fourier Transforms (FTs) and Optics took some interesting turns.
Let me try to pick up on the original intent. It appears a necessary part of
using FTs is to have a PSF for the physical optical system. I would guess
this means if one has a simple lens only, one needs a ...

We're all taught about the duality nature of light, that the light
wave is made of photons, which behave like particles.
Now suppose you have a plane light wave that propagates forward. Along
the way, at a given time, are the photon densities the same

Whatever your take on the Easter story, I want to wish you all a very
happy Easter Day.
(Personally I'm celebrating the Resurrection.)
Cheers,

A couple of questions--
Anyone knows if there is a cheap way to add a phaco condenser to a Nikon SE?
What's the main drawback of using 20x oculars instead of higher
magnification objectives?

A question - can someone tell me what I would need to add a MC-63(a) on top
of the PhotomicIII? What intermediate tube, what optics would be required?
Or would you have a better idea to take 4x5 inch micrographs on the PmicIII?
Thanks

There have been brief references to the commonality of Leitz Ortholux,
Orthoplan and Panphot components across the various product lines.
While I can find references to the Ortholux and Orthoplan (thanks to
the generousity of this group's members), I do not see any information

Folks,
I have a question about the design of a novel laser.
Propane flames emit light at around 4.5 micron, see:
http://www.mindef.gov.sg/imindef/publications/pointer/journals/Pointer_Journal_2
007/Vol__33_No__2/Use_of_Multi-Narrow_Band_Filters_and_the_Analysis_of_Narrow_Ba
nd_Images ...

I've looked over some optics texts that use FTs to solve problems. With my
very basic understanding of the physics behind optics, it's something of a
puzzle how they do get used.
Long ago I used LaPlace transforms to solve problems in circuits, and

For a module from a green laserpointer rated 30mW output
I want to make a constant current source with TTL input.
Is something known about efficieny for 532nm/808nm output
ratio or milliwatts per milliamp (DPSS lasermodule).

Does anyone know if there is any solid state rod that has a low enough
threshold that it can be pumped by the flashtube of an ordinary camera-
type xenon electronic flash unit?
Ron