Countless ultrafast imaging techniques have been developed and even though they brought significant insights, their application out of a laboratory environment is however often quite limited, either by the complexity of operation or by a heavy data processing. We demonstrate flexible single-shot imaging via the combination of sequentially timed all-optical mapping photography with acousto-optics programmable dispersive filtering and digital in-line holography. The frame rate and exposure time can be independently adjusted without complex shaping stages, making the system remarkably agile. In-line holography allows to achieve an even higher simplicity through its lensless operation and the reconstruction on a wide depth of field.
Different methods of optical vortex detection were investigated. The method of generating optical beams with a nonzero orbital angular momentum using a liquid-crystal HoloEye LC-2002 light modulator was demonstrated, and various methods for detecting optical vortices were tested. The distance at which the structure of the vortex beam decays for the technically possible aperture of the receiving interference system was determined. The results of experimental studies of beam size at different distances were presented. Calculations of the beam and the singularity of the optical vortex divergence angle are performed as a function of the length of the atmospheric path. Additional method for vortices detection based on data from the output of the Shack-Hartmann wavefront sensor using a machine learning system was also presented.
The dynamics of propagation of an optical vortex through an artificial enclosed atmospheric path was examined. The method of generating optical beams with a nonzero orbital angular momentum using a liquid-crystal HoloEye LC-2002 light modulator was demonstrated, and various methods for detecting optical vortices were tested. The distance at which the structure of the vortex beam decays for the technically possible aperture of the receiving interference system was determined under the conditions of the stand. The results of experimental studies of beam size at different distances were presented. Calculations of the beam and the singularity of the optical vortex divergence angle are performed as a function of the length of the atmospheric path. The influence of the turbulent medium on the ability of the receiving system to register an optical vortex was also considered.
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