Natural Science Forum / Physics / Optics / July 2007

Is it theoretically-possible to facilitate hydrogen-hydrogen fusion
within the earth's troposphere using a laser? If so, what would be the
maximum wavelength [or minimum frequency] and minimum intensity of
laser light required for this? Also what would be the minimum

Hi all, I'm looking for some help with my optics setup.  I want to
create an approximate point source from collimated laser light.  Since
any focused spot has finite size, the source is never an infinitesimal
point, and the source has a numerical aperture.  I need a fairly large

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I am looking at two competing spectrometers for looking at the region
0.9um to 2.something um.  I'll try to summarize:
                     Ocean Optics           StellarNet
                     ------------           ----------

I am a new fellow in this field.
Please help me out suggesting which software to use for designing
laser systems, or gaussian optics systems.
is there any good books which deal with the problems of gaussian

I'm using my Coherent 212 laser power meter to measure the output of
some green dpss lasers I have.  The meter is calibrated for the head I
have, and I have the spectral sensitivity curve for the head as well,
so I'm good to go in those respects, but I have a couple of basic

I ran across a Zeiss 44 72 17 100W lamphouse in my remnants box.  It
should fit either an Axioplan or Axioskop 1.  It is near new condition
showing only two small paint scratches.  Lens is perfect.  Unit is
probably at least seven years old and was a spare house.  I thought I

OK...this might be a totally dumb question, but before I spend the
money on the adapter, I want to make sure that I get the right one.
I'm going to mount a older polariod dmc2 camera on a zeiss microscope.
The information for the camera states that for the c-mount adapter,

In the Kohler illumination, the image of the light source should be
ultimately projected onto the rear focal plane of the objective. But
when the objective moves up and down to acquire a stack of images, its
rear focal plane also moves. So what is the mechanism that allows the

           Focusing through Sapphire Plate
We are trying to focus an ideal converging beam through a 6 mm plane
parallel plate of Sapphire. The focal point should be at the back surf of
the plate.

I recently purchased an unused Coherent C315m 100Mw laser.  It is a brand
new unit, however, it is dated 1999.  I intend using it for holography.
It all works perfectly and stabilises at around 60Mw on my power meter.
Feedback from the digital controller shows the power setpoint ...

I try to learn some topics from optical wave propagation.
I have read recently some papers and books  that concerns such
subject
matter and I found that in many papers Helmholtz equation is

Some references define the Field Of View (in object space) of an
Optics System as
Field Of View = Detector Size/EFL    (1)
where

I am trying to build an optical spotlight with a super narrow beam
spread.  Like an 18" circle from 20-30 ft away.
What kind of reflector to use? What diameter?
What lens? bi-convex. plano-convex? In what order? What is the

We're moving some lighting truss in a night club, and will need to extend
power. The system is using Socapex type 19 pin connectors made by Kupo.
Is it possible to buy used jumpers that are compatible with the Kupo brand?
I forgot to look specifically, but imagine that we would ...