Natural Science Forum / Physics / Optics / February 2005

With the popularity of DIY monitor/projectors these days, I was just
wondering if using three lasers(RGB) as the projection light source is a
good idea? The LCD panels most people are using are polarized, and they
have the unfortunate side effect of absorbing most of the light we ...

Are my eyes damaged ?

I have a blue dpss and a green dpss I would like to combine befor putting it
through my scanner.
At the moment i am using a 50/50 beamsplitter cube but obviously i have a
second beam that is using half my power.

I just figured out that my zeiss is fitted for epi-fluorescence too!
The other lamp, which I thought was "just" for incident
illumination, is a 100w mercury jobby (bright as hell once it warms up)
and the block under the objectives has a filter pair installed (blue

have a number of 1.375" x .040" blanks surplus to our needs .

I just saw the video of David Copperfield where a laser beam cuts him
in half. I dont know which tour he did this act on as I havent seen him
live for about 10 years.
Any comments on this effect?

My friend found 20 cm long laser with 2 kV HV psu.
Is this af any use, he wants to give it to me? What power is it?
Kre¹o

If an oil immersion lens has an iris that allows the N.A. to be reduced
below 1.0 - can it be used without oil?
Similarly - if an immersion lens without an iris is rated with an N.A.
of (say) 0.9 or less - then can it too be used dry?

I want to examine my cum, because I think that after working in the
nuclear power plant for 40 years, it's dead.
What do I need ?

I am trying to make a little handheld device that will project an image
onto a surface (like a wall).  I want the image to be as wide as
possible (ideally 12-24 inches in circumference) but I want the
projection device to be as short as possible (ideally 1" long or less)

I'm working on a yearly repair job and it was time to do a complete overhaul
of an AO series 10 inverted.  This is the only one of these I do so I had no
experience but I have done at least a 1000 of 10's.  It was a fun job.  Now
when you do a series 10 you need to remove the ...

I am looking for a lenslet array with about a 5mm pitch and an array size of
at least 6x6.  Should be spherical, with f#>10 and close to 100% coverage.
Any pointers would be appreciated.
Thanks in advance,

We have been developing red lasers and can now after 2 years of testing and
development can offer red lasers in the following wavelengths
628nm, 630nm, 635nm, 638nm,
power between 300mw and 400mw

Can anyone tell me anything about these lasers.  The coherent website
states that:
"The GEM CW series is a single integrated package for ease of
integration (no RF cable; single package to mount/cool). Also has a

Found this post in rec.aviation.piloting