Bessel beam

A Bessel beam is a type of light wave that maintains its shape as it travels, unlike typical beams that spread out. It consists of a central, bright core surrounded by rings of light. This unique structure allows Bessel beams to focus on a point and remain sharp over long distances, making them useful in applications like microscopy and optical communication. They can also move through obstacles without losing their clarity, which is valuable in various scientific and engineering fields.