Re: transmittance @ 1550 nm

Hi Brian
I'm interested in 1.55 because it's eye-safe and also because it's
often used in telecommunications.

al

Brian Howie wrote:
In message <1157721463.314828.243910@xxxxxxxxxxxxxxxxxxxxxxxxxxx>, al
<alankoivunen@xxxxxxxxxxx> writes
Hi - I'm working on a project to measure atmospheric turbulence using
transmissions from a 1550 nm laser and a receiver built around an
off-the-shelf telescope
(like the Meade LX and RCX series). I'm trying to find out, roughly,
what the transmission losses are at this wavelength, and the Meade
technical guys don't seem to answer their telephones.

Does anyone out there have a ball park idea what the losses are for
these telescopes at this
wavelength ?


Thanks
Alan


p.s. I'm trying to build a simpler version of the instrument described
in


http://www.dur.ac.uk/g.d.love/downloadable/slodar2005.pdf


I can't answer your question, but I'm curious about why 1.55um

I use one of these at work to do the same job, it uses two lots of 450
red leds

http://www.scintec.com/Site.1/PDFs/01_LayBLS.pdf

Brian

--
Brian Howie

.

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