Natural Science Forum / Physics / Optics / March 2006

I've got several Omnichrome 150 power supplies here that are partially
working.
#1 works nearly perfectly, but won't produce more than 8.5A.  I tried
several different heads with anode voltages of 105-112 and it runs them

I did a cursory search found nothing, do any of you out there know of
this laser ?
Copied from another posting
"I have heard about this device, it is in the W range, its from a

I am looking for a Harsh environment high temperature sensor.
Medium -  corrosive gas at combustor exit
Medium temperature - 1000-1200 deg C.
Can optical fiber sensors meet this requirement? what is the max

I have also posted this on sci.optics.fiber
Does anyone out there have any visibility as to how much dark fiber
there is out there?
A reference that shown the plot of unlit-fibr-km vs year would be ideal.

Hi world,
Is it possible to calculate the tangents of the dispersion coefficient
slopes for the SMF and NZ-DSF from a dispersion curves?
Thanks.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=7597684018
I saw another picture like this a couple of days ago, and the beam was
being shone into the centre of the transistor socket! If it's a fake, it's
a crazy stunt for someone with 100% positive feedback of over 1000, but ...

I've set up the double split expirement with a laser and a mirror.  I
cut two slits into the mirror with a razor and glued it to the end of
my laser.  When I shine it in the dark I see a clear wave pattern on
the wall.  That's great but I want to set up a photo detector on one of

Dear Optics Group,
I came up with an idea (which I'm keeping confidential for now) for a
way to stabilize a filament light-source.  The technique offers the
advantages of stability, quick warm-up time, and low-cost.  My question

I face new problems now:
1. I've did read about photodiodes and it seems that the response time
is about 100 ns. Can I measure the fluctuations in the intensity of a
light ray which occurs at smaller intervals of time (pico seconds for

I've got a 3 unidentified items here that look not a million miles from
laser diodes stuck in big brass heatsinks with collimating optics. But I'd
like to know for sure, and maybe resurrect them into life if they are indeed
lasers (and not something more innocent and less fun). ...

I need a video camera for 1550nm, for example an IR vidicon camera. Any idea
where to get a cheap one (let's say < $500) ?
Are there any CCD cameras for 1550nm?
Thanks,

I need a little advice on Z folded cavity for femtosecond laser. Why
this type of cavity is widely used in the construction of femtosecond
laser. What is the advantage and operation principal. Any ideas?
Thanks.

When we take away the emission filter and look via the eyepieces we see
2 different spots of our laser light.
Description of our optical path:
We focus our 405nm laser beam through a dichroic mirror which reflects

I've got a bunch of parts here that I'm thinking about trying to make
into a diode pumped, frequency doubled laser.  The heart would be a 20W
808nm laser diode bar pumping a 15mm long, 1mm diameter YAG rod.  This
is already mounted in a gold plated copper reflector / heat sink ...

here's your "shot-in-the-arm" hopefully for you long-timers of this ng (saw
recent thread about ng dying).
i'm not completely new to lasers and am fairly adept with electronics. i've
done my homework so as not to annoy anyone here too much with stupid