Using air to deflect lasers

https://phys.org/news/2023-10-air-deflect-lasers.html

"invisible air grating immune to laser damage, preserves original beam quality... uses acoustic (frequency and intensity) dense and less dense air waves forming striped grating changes laser direction... 50% redirection efficiency soon to be significantly higher... IR laser pulse peak power 20 GW... fast switch high-power lasers, material processing, fusion research, particle accelerators, high-performance optical gratings, lenses and waveguides... also use other gases with other wavelengths and their optics and geometries"