Related Experiment Video
Updated: Jul 9, 2025

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
Focusability of coherently combined beams propagating downwards in the turbulent atmosphere
Abstract:
The focusability of coherently combined beams (CCBs) propagating from orbit through the turbulent atmosphere to the ground is studied, where the diffraction, self-focusing and turbulence effects are considered. It is shown that the spot size on the ground of CCBs is much smaller than that of incoherently combined beams (ICBs). The analytical expression of the B integral of CCBs propagating in the turbulent atmosphere is derived, and an effective design rule for the CCB power transportation without filamentation is presented. It is found that the focusability of CCBs propagating in the turbulent atmosphere can be improved by the gradient power distribution method, and the spot size on the ground can always be reduced below the diffraction limit. Furthermore, the optimal gradient power distribution to reach the highest focusability on the ground without filamentation is presented.
Related Concept Videos
Deflection of a Beam
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
Steady, Laminar Flow Between Parallel Plates
Laminar and Turbulent Flow
Steady, Laminar Flow in Circular Tubes
Focusing of Light in the Eye
Turbulent Flow

