Natural Science Forum / Physics / Optics / January 2005

What is the best way to measure the current through a 1.2W pump diode?
The reason I'm asking is because I need to replace a pump diode and
adjust the power supply.
cheers, Matthijs

I have been only reading this  news group for a few days, hope-ing to
find some info on availability and price (reasonable if possible) of a
CO2 laser that I could cut/burn Nylon Sail cloth, with a hand held
tool, that I could move around the inside,or out side of a template

Does anyone know what it costs for a Pockell's cell crystal?  I have a ruby
laser (Holobeam 300) with the q-switch but the faces of the crystal are in
pretty bad shape.  Is it possible to refinish them or will it need to be
replaced?

Hello to everyone,
I am confronted with someone stating that the cos^4 law is "a
meaningless rule of thumb" and lens design (for photographic lenses) can
be done such that at the boundary of the image circle one can have more

Hello to everyone, in case you are interested, I would like to point you
to my redesigned photomicrography website:
http://www.gnyman.com/Photomicrography.htm
Thanks for looking!

I checked my diode sensor from Control Laser unit and when hit by red
laser pointer (ca.2mW) it is giving 950uA (bare diode monunted in BNC
barrel+glss). I see there is another glass plate prior to diode chip
(bare chip 6x6mm ! mounted on top of BNC connector!) but this glass is

Better don't try to use RG-8 RF coax for power wire :-)
I use common 5x2.5mm square power cable, where each conductor has it's
own insulation, then all 5 go into another, common one. I used 2 wires
for each pole of the lamp. I use series ignition transformer and I

does anyone know what type of wire to use between a yag power supply and the
head (lamp) that would be good and safe for a 100 watt laser. also a
supplier of that wire. I believe I need for 50 amps but the ignition pulse
voltage is my concern.

This link is being offered over in the rec.aviation.piloting. It shows a laser
scanning across the cockpit of a jet.

Bob,
Your rectangular IR sensor behind HR mirror (with BNC on the back
side) should be factory equipped with longpass IR filter to cutoff all
the light below lasing 1064nm, otherwise it will be measuring also

Speaking of reducing the sensitivity of a laser power meter (from another
thread), anyone have a piece of an ND2 filter made of a material that
has a negligible photochromic effect?  I have one that came from a
Scientech high energy sensor but its transmission appears to *increase* ...

hey guys!!
if you know where, could you please help me with finding information about:
1.Open Shortest Path First - OSPF - an interior gateway routing protocol
developed for IP networks with some optical extensions

What could this be?
The output aperture is at a 60-70 degree agle with respect to the face.
Dimension about 6"x4"x2", weight 1.5kg
There apear to be 2 fiber connections at the back.

Actually, my friend bought a laser pointer from these guys
(http://www.greenlazer.com/) and I figured I'd make his opinion known.
After having the laser less than three weeks it up and died.  I was not
surprised because the quality of construction was pretty sketchy but he was

I just got an SDL 7460-P6 which is a 3W 632nm bar coupled into a 600u
fiber.  Wow - lots of red in a small, solid state package!  I'd really
like to use this in a laser projector, but I'm pretty sure I'm not going
to be able to get a very usable beam out of it.  According to the ...