Twisted speckle entities inside wavefront reversal mirrors

TL;DR

This paper reports a novel property of optical speckle patterns inside wavefront reversal mirrors, revealing twisted entities formed by interference, which are relevant to various phase-conjugating mirror systems.

Contribution

It uncovers the existence of twisted speckle entities in wavefront reversal mirrors, a previously unknown phenomenon observed through numerical simulations.

Findings

Twisted speckle entities form around optical vortex lines.

These entities occur across various speckle parameters.

Relevance to Brillouin and four-wave mixing phase-conjugate mirrors.

Abstract

The previously unknown property of the optical speckle pattern reported. The interference of a speckle with an oppositely moving phase-conjugated speckle wave produces a randomly distributed ensemble of a twisted entities (ropes) surrounding optical vortex lines. These entities appear in a wide range of randomly chosen speckle parameters inside the phase-conjugating mirrors regardless to an internal physical mechanism of the wavefront reversal. These numerically generated interference patterns are relevant to a Brillouin $\bf PC$-mirrors and to a four-wave mixing $\bf PC$-mirrors based upon laser trapped ultracold atomic cloud.