Chairman
"While directing our main efforts to the key sectors of science and technology, we must develop the new spheres of science and technology, including lasers, and actively introduce the latest achievements of science and technology into the new factories and projects for technical improvement. In addition, we must intensify the study of mathematics, physics, biology and other basic sciences so that they contribute positively to the national economy and the development of science and technology."
In the recent years, the propagation of laser beams through free-space and turbulent atmosphere has attracted more and more attentions because of many applications in the fields such as remote sensing, laser radar, free-space optical communications(FSO), laser imaging and tracking. Therefore, many studies related to the propagation of various kinds of laser beams in the turbulent atmosphere have been comprehensively carried out. Needless to say, most of these studies have been restricted to the cases of horizontal path; however, the slant path is the more practical case, and more prospective in several applications such as free-space optical communications, deep-space communications, ground-satellite communications and secret communications for military purpose. Due to its importance, the propagation properties of many types of laser beams in a slant path have been also studied more recently, such as Gaussian beam, anomalous hollow beam, flattened-vortex beam and etc.
On the other hand, with the rapid development in femtosecond pulsed laser technology, much attention is being paid to the propagation of chirped Gaussian pulsed beam in the horizontal path in turbulent atmosphere. In these investigations, the evolution of axial spectra of chirped Gaussian pulsed beam, spectral property of ultra-short chirped Gaussian pulsed beams diffracted by Gaussian aperture in dispersive media and the influence of oceanic turbulence on the spectral properties of chirped Gaussian pulsed beam have been considered in detailed. Especially, the spectral anomalies of ultra-short chirped Gaussian pulsed beam diffracted at the aperture have been investigated due to their potential applications in information encoding and transmission and its validity has been confirmed by the experiments. Quite recently, the investigation on the spectral shifts of chirped Gaussian pulsed beam propagating in slant atmosphere path has been reported.
In this paper we studied the spectral behaviors of chirped Gaussian pulsed beam diffracted by a circular aperture propagating in slant turbulent atmosphere path and their potential applications.
Fig. 1 and Fig. 2 show our main results.
Herein, one can see the spectral switch may occur near phase singularities for the apertured case. Our research results can have potential applications in achieving information encoding and transmission in slant turbulent atmosphere.
These results were published in the journal "Optik-International Journal for Light and Electron Optics" [244 (2021) 167522] under the title of "Spectral behaviors of diffracted chirped Gaussian pulsed beam propagating in slant turbulent atmosphere path" (https://doi.org/10.1016/j.ijleo.2021.167522).
