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A quirk in scientific 3-D modeling has led to the discovery thatlaser lightcan — under the right consideration — cast its own shadow .
The determination challenges our current understanding of what a shadow is , researchers write in a raw newspaper publish Nov. 14 in the journalOptica .
" Laser light casting a phantom was antecedently thought out of the question since light commonly pass through other light without interacting , " bailiwick co - authorRaphael Abrahao , a physicist at Brookhaven National Laboratory , said in astatement . " Our demonstration of a very antagonistic - intuitive optical effect invite us to reconsider our opinion of shadow . "
think shining two torch ray through each other — neither one freeze the other . However , some 3D data processor models of optical maser systems depict the optical maser beam as a cylinder . Those good example give the faux optical maser irradiation its own shadow because they treat it as a square object instead of a ray of lighter . During a lunchtime conversation about this quirk of the clay sculpture arrangement , some of the scientist wondered whether they could replicate the phenomenon with a material shaft .
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" " What start as a funny give-and-take over lunch led to a conversation on the physical science of laser and the nonlinear ocular reaction of materials , " " Abrahao say in the statement . " From there , we resolve to conduct an experiment to demonstrate the phantom of a laser beam . "
The researchers set up an experiment with a ruby lechatelierite , a popular material for consider strange properties of light . They aim a green optical maser and a low laser into the ruby at proper angles to each other . On a screen opposite the down laser , they saw a dark seam where the green laser blocked blue light leaving the crystal .
This curious phenomenon arises from a property of the ruby itself . When the green optical maser encounters particle along its path through the watch crystal , it yield the negatron in those atoms a mo of extra energy . In their gamey - energy commonwealth , those electron can absorb profane light from the second optical maser . The green laser beam thus deport like an aim , blocking the blue light and regorge a dark tune across the screen .
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That morose argumentation meets all the criterion for a shadow : it was visible by centre , it take the shape of an object blocking illumination and it moved as the researchers be active the green laser .
The scientists also found that they could tune the intensity level of the green laser to create a darker or clean shadow . The maximum dividing line between lighted and shadowed area on the filmdom was about 22 % , similar to the contrast of a tree ’s fantasm on a sunny day .
" " This find expands our savvy of low-cal - matter fundamental interaction and open up up fresh possibilities for use visible light in ways we had n’t consider before , " " Abrahao allege in the argument .
This determination could try out useful in various fields , Abrahao supply . One instance is optical switching in devices that rely on brightness level to control the comportment of another lighting , or in technologies that require accurate control of clean transmission , such as high - powered lasers .
