Natural Science Forum / Physics / Optics / April 2006

Does YAG/ vanadate only absorb the pump light  when it's in its cavity
and lasing? ie does it effectively go from being transparent to opaque
(at say 807nM) over a few mm depth - dependant on doping level?
I think I may have answered my question already today while trying to

Hi again,
I have a question with anyone who's had a chance to work with closely with
both the older 160mm Zeiss objectives and the newer ICS optics,
particularily with water immersion lenses.

Anyone has a clue or experience why this is happening on this model? We
are using one in our lab for experiments in laser microscopy.
Appreciate any help?

I'm looking for a reliable vendor for custom cylinder lenses.  These
are plano cylinder in form, about 12mm x 12mm cross section.
Please don't reply unless you have had experience procuring custom
lenses.

Hi to all,
I am new to the world of lasers and I haven't found answers to my
question on the net yet.  Hope you can bring me further.
I have a surface made of extremely clear polymer (e.g. Envirotex lite -

There was a download bug for the KDP2 demo which was reported today
and fixed.
Sincerely,
James E. Klein

I am looking at the USB digital microscope eyepiece at
http://www.physlink.com/estore/cart/USBDigitalMicroscopeEyepiece.cfm
Someone on one of these lists recommended it.
It does not say how many megapixels.   Home Science Tools, where I bought

Now, you can buy outstanding eyepieces from Nikon, Zeiss, Olympus, etc.
But it wasn't always that way.
I wonder why it took companies making microscopes so long to come out
with decent eyepieces?

I'm am currently building a text projector which utilizes a single
laser module, along with a motor driven mirror disc to project letters
onto a surface. The concept works great, but the laser module is a
bottleneck, that is, I can't modulate it fast enough so the text

Hello, just curious, what amount of 660nm would I need to make for a nice
balanced yellow, when combined with a dichro with 35mW of 532nm?
Thanks!
Dave

Does anyone knows where I can find :
HgCdTe Linear Array or InGaAs linear array with a non-negligeable
responsitivity around 2000 nm.
The price should be reasonnable.

Why does the wave gets bent when it travells from one RI to another,I
know it's basically beacuse of change of speed.How does one can
visualise the travelling of a wave in a medium?

I don't hang out on alt.lasers, so this question may have been
asked and answered or ridiculous, but my google got nothing relevant.
Does anyone know if there exists a LASER or MASER that uses
thermally excited atoms to lase? If so, where can I find more info?

Can anyone tell me that is the property that describes why a laser get
larger (wider) over distance: what is this called?
For example when I use a laser pointer, what is the property of the
laser that describes why the laser on the wall at 20 feet away is

I am trying to understand what is needed to photo engrave on polished black
granite with a laser.  From what I have read you could use a 20 watt CO2
laser on a CNC table that allows the laser to navigate over the granite
surface.  The laser must engrave a halftone pattern, a ...