I want to generate a bending of laser beam propagation in free space or underwater, I think an underwater occurrence of a bending of beam under conditions such as turbidity, increase of water temperature. I need some ideas to apply this phenomenon
Two ideas
1) Set up a temperature gradient in the water (cold at the bottom hot on top to avoid creating vertical mixing and turbulence) The temperature gradient with set up a similar gradient in refractive index and similar to a mirage in the desert, the light rays will bend
2) Read the literature on Airy beams. In these beams the position of maximum intensity moves sideways (usually only slightly) upon propagation. No gradient in refractive index is required.
Here's another one - add (without mixing) kitchen salt to the water tank - if you use enough salt, you can bend beams with tiny cross sections, like a "laser" pointer. It was my favorite high-school experiment!
Hi,
The easiest way could be using water to guide your light beam in free space, i.e., creating a " water fiber" by coupling light into water that fill a tank with a hole in one of its sides, and letting gravitation do the rest of the work for you...
I hope it helps,
Assaf
Theoretically we can create by passing laser in medium varying refractive index . acceding in order but in practice I have not done yet.
Kamal
In the 1960's, Bell Labs experimented with thermally created gas lenses to guide a laser beam, little heated tubes with colder, denser air in the centre, steered the light. This would also work in liquid.
Play with phase masks, the reason why Airy beams bend is due to the interplay of two wavefronts with opposite curvature.
My Dear Salam Nazhan, I need ideas to generate a bending of laser beam propagation in free space for lab scale or underwater
In a specific applications could be use a short fiber just to bend the laser beam for a distance or direction
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