Doughnut-shaped laser used to create an optical fibre out of air
https://www.newscientist.com/article/2356816-doughnut-shaped-laser-used-to-create-an-optical-fibre-out-of-air/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
Doughnut-shaped laser used to create an optical fibre out of air