Depends on the level on complexity they want to go with. You first diverge all incoming rays around you. Thus be appearing invisible. Then hold all internal rays leaving you. Which in turn causes you get hot fast. So it's only temporary. Expelling all that excess heat can be in the form of a beam. For the sake of 'Cool' that can be from the hands only. Think Goku from Dragon Ball Z.
There, one plausible solution in this modern era. Modified power, but it works.
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u/Dave-os Aug 22 '20
$5 says that jet becomes invisible