Laser light in water

**lasersandlights** · 05-12-2009, 15:13

Does laser light when directed at water, defocused or focuses, react differently than another lighting source, say led's?

**Laserman532** · 05-12-2009, 16:05

Originally Posted by lasersandlights

Does laser light when directed at water, defocused or focuses, react differently than another lighting source, say led's?

do you own a laser pointer?

**Doc** · 05-13-2009, 12:20

I believe the diffraction is wavelength dependent rather than coherence dependent. I may be wrong.

**keeperx** · 05-13-2009, 12:35

here is an example of how laser light detracts in water,
pictures are from this sight
http://www.warren-wilson.edu/~physic...on/index.shtml

**daedal** · 05-13-2009, 13:47

The key word here is "refractive index"...

Just like Doc said, this is more about lambda rather than coherence...

Keeperx... that picture seems to be missing the effect of the laser meeting the glass at the bottom of the fish tank

--DDL

**allthatwhichis** · 05-13-2009, 15:40

Makes me want to get a fish tank to play with though...

**Doc** · 05-14-2009, 06:47

Originally Posted by allthatwhichis

Makes me want to get a fish tank to play with though...

Unrelated but;

I found that my tropical fish were profoundly attracted to the beam from a 3mW red pointer, they'd chase it up and down the tank all night.

Maybe a good fish bate on the base of a fishing float?

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