Natural Science Forum / Physics / Optics / October 2005

I'm trying to construct a long range (650ft/200m minimum) infrared
break beam.  I'm not sure of the best way to accomplish this, but one
of my ideas is to take a long range green laser pointer, like this one
for example (http://www.thinkgeek.com/gadgets/lights/5a47/), and remove

Anybody in the US using Mamba Black?, I'd like a review in English, not
German. I have a regular Mamba setup here and one I bought for a friend
for a club install.  We're using the MAX 506 parallel port DAC (only 8
bits) and are happy with it, but I'd like to know how well the VST

I am new to Fibre optics and don't know where to look.
I am looking for plastic fibres that are tough and flexible.
Idealy they would be as tough and flexible as fishing line.
The light transmission properties are secondary as I am designing a

Can someone here share his experiences or opinions about the OptisWorks
program? http://www.optis-world.com/G_O.asp?soft_id=3
It is an extension to Solidworks and advertised to be a full featured optics
design program. Its advantage is the full integration of optical elements in

does anyone know the output power of the new blue laser diodes that are
going to be used in the new dvd-rw systems planned for 2006

    can anyone help me to find information about
particulate aerosol laser sensors?
Any information can be useful.
Thanks in advance, SBS.

Diffraction, seen when light passes through a diffraction grating, and the
pattern produced by overlaying two net curtains (for example) are both
referred to as 'interference' patterns.
But it seems clear to me that these two are unrelated effects, despite the

I plan to cut a softer Epon block of retina with a histological
microtome (Leica). Because Epon is hard I plan on using a tungsten
carbide disposable blade.
These blades are not cheap, so I wonder what people think of Leica

Heads up for anyone experimenting on tripling YLF or YAG .
1. Qty (2) LBO crystals made by Castech
2. Qty (1) 75 uF, 1,500 VDC pulse cap
See " http://search.ebay.com/_W0QQsassZlaserloverQQhtZ-1 "

For Auction, a Marconi T250 Pulsed CO2 Laser.
Pulse Energy of 38 millijoules Ebay Item number: 7557959305

I have a 0.4W  @ 0.6A CW laser diode , can i pulse it safely ? (eg 10us
pulses of 6A )
you can see the diode here
http://cgi.ebay.com/JDS-Uniphase-High-Power-Laser-Diode-with-Optic-Fibre_W0QQite
mZ7556534819QQcategoryZ9712QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Dear group.
Can anybody inform me about who sells 1450 nm laserdiodes? The ones I
contacted so far did not have any in stock and I need some quite fast (CW
type 5-10 mW)

I am looking for graded-index multimode fiber with large core diameters
(>400 micron).  There was a company in Germany who offered some ~600 um
fibers but I forget their name.
Any suggestins will be appreciated

I wonder what kind of algorithms are used in comuter document scanners
(e.g., flat bed ) for high resolution scanning.  There must be some
kind of subpixel processing involved.  Also, in addition to sub-pixel
they must go beyond optical resolution of the lens.  I wonder how.

  We need to make measurements of the spectral reflectance and
transmission of a 4" x 8" window in the visible.  The accuracy should
be within a percent or so, and the spectral resolution sufficient to
characterize laser line filters.  This is a development effort, and