No mirrors: In a first, lasers deflected using only air

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In the past, objects such as lenses, prisms, and mirrors have been used to direct these high-energy beams, but with increasing intensity of the beams, the shortcomings of these objects have come to the fore. Not only do these lasers cause damage to these objects, but they also undergo degradation to certain extents that interfere with experimental setups.

The loudspeakers allowed for the creation of a striped grating using dense and sparse areas of air. Just like differences in the density of air lead to differential bending of light in the Earth's atmosphere, the density differential in the grating could be used to bend the laser beams.

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