Measurement and statistical analysis of the wavefront distortions induced by atmospheric turbulence using two-channel moiré deflectometry

Atmospheric Turbulence Characterization and Wavefront Sensing by Means of the Moiré Deflectometry

Adaptive optics compensation of multiple orbital angular momentum beams propagating through emulated atmospheric turbulence.

We propose an adaptive optics compensation scheme to simultaneously compensate multiple orbital angular momentum (OAM) beams propagating through atmospheric turbulence. A Gaussian beam on one polarization is used to probe the turbulence-induced wavefront distortions and derive the correction pattern for compensating the OAM beams on the orthogonal polarization. By using this scheme, we experime...

Performance and Evaluation of Interferometric based Wavefront Sensors

Adaptive optics (AO) is a technology used to improve the performance of optical systems by reducing the effect of wavefront distortions. It is used in astronomical telescopes and laser communication systems to remove the effects of atmospheric distortion. An AO system basically consists of three main components, a wavefront sensor, a wavefront corrector and a control system. A new wavefront sen...

A Fourier Series Based Atmospheric Phase ScreenGenerator for Simulating

A new Fourier Series atmospheric phase screen generator is introduced. A Fourier Series (FS) is used to represent the wavefront phase as a two dimensional periodic function. The period of the function is chosen to be much larger than the outer scale of the turbulence and thus the FS accurately represents the power in the low spatial frequencies of the wavefront. The accuracy of the representati...

On an Adaptive Control Algorithm for Adaptive Optics Applications

The wavefront aberrations induced by atmospheric turbulence can severely degrade the performance of an optical imaging system Adaptive optics refers to the process of removing unwanted wave front distortions with the use of a phase corrector before the image is formed The basic idea in adaptive optics is to control the position of the surface of a deformable mirror in such a way as to approxima...