Femtosecond Filament Coupled with Structured Light for Free-Space
AbstractThe generation of a laser filament through clouds produces a shockwave
which displaces the small water droplets from the air to create a
quasi-transparent channel through which, information can be transmitted.
We present a robust method that utilizes the channel for free-space
optical communication using structured light beams coupled with a
femtosecond filament. Structured light beams based on their spatial
profiles are perfectly suited to propagate around the filament. We have
also developed a 4-bit communication channel using a segmented annular
beam. Our system demonstrates resilience to noise and is unaffected by
the filament. This method can improve the scalability, robustness, and
capacity of the free optical channel.