TaterMay
0
- Joined
- May 16, 2015
- Messages
- 350
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So I was playing around with my lasers late at night, and I discovered an interesting effect when shining my lasers into the kiddie pool at my apartments. What's interesting is that it only happens in the kiddie pool, which is 1 or 1.5 ft deep. If I shine it in the normal pool, which goes down to about 4 ft deep, the effect disappears. I am quite sure it is due to the coherence of the beam, but I can't for the life of me come up with why it would only happen in the shallow water.
Also interesting to me is the fact that the shadow appears to be perfectly circular around the beam regardless how steep the angle is between the beam and the surface of the water. I imagine this is due to the water diffracting the beam and making the beam more perpendicular to the plane of the surface once it is actually in the water.
Some further testing I would like to do is determining at what depth the effect begins to appear, if it disappears again with more shallow water than the kiddie pool, and if focusing/defocusing the beam affects the shadow. What do you guys think?
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-42-59_zpsntevaqrg.png.html][/URL]
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-43-23_zpswxzvbpzt.png.html][/URL]
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-43-32_zpskaswypdo.png.html][/URL]
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-42-27_zpsy8fynvcv.png.html][/URL]
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-42-41_zpsxqddwp1x.png.html][/URL]
Also interesting to me is the fact that the shadow appears to be perfectly circular around the beam regardless how steep the angle is between the beam and the surface of the water. I imagine this is due to the water diffracting the beam and making the beam more perpendicular to the plane of the surface once it is actually in the water.
Some further testing I would like to do is determining at what depth the effect begins to appear, if it disappears again with more shallow water than the kiddie pool, and if focusing/defocusing the beam affects the shadow. What do you guys think?
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-42-59_zpsntevaqrg.png.html][/URL]
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-43-23_zpswxzvbpzt.png.html][/URL]
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-43-32_zpskaswypdo.png.html][/URL]
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-42-27_zpsy8fynvcv.png.html][/URL]
[URL=http://s356.photobucket.com/user/TaterMay22/media/Mobile%20Uploads/Screenshot_2015-09-10-09-42-41_zpsxqddwp1x.png.html][/URL]
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