[Laser] Voice communication using 940nm IR LED in full daylight

[Tom Becker]

I had a conversation with a laser buddy about atmospheric absorption 
some time ago, specifically about what to expect in optical ducting over 
water, like ghost-shipping mirages.  When this occurs, I understand, 
reflections under a thermocline extend the apparent optical horizon to, 
sometimes, great distances.

We questioned what absorption to expect when the path is very close to 
the water surface, what is the nature of the thermocline, cooler-above 
or cooler-below, and how that plays with relative humidity and, thus, 
absorption close to the surface.

Does anyone have experience with low over-water paths?


Tom
Cape Coral