We propose and experimentally demonstrate a noninterferometric method to quantitatively determine the topological charge complete phase structure of vortex beam scrambled by random scattering medium. In proposed technique, with an arbitrary coaxially enters into medium another nonvortex orthogonal polarization state. This couples spatial modes coherent light prior entering Correlation states field encodes signature twisted mode beam. Recovery complex correlation functions hence are retrieved...

A simple interferometric polarimeter with an integrated calibration scheme is proposed for accurate and fast mapping of the state polarization (SOP). Conventional single-shot polarimeters that detect amplitude phase orthogonally polarized field components by interferometry using Fourier fringe analysis suffers from errors caused imperfect reference beam ambiguity in spatial carrier frequency pattern. In system, eliminates those error sources enables measurement SOP without prior knowledge frequency.

Propagation of a coherent light through an anisotropic random medium generates randomly polarized field, known as polarization speckle. In this paper, experimental technique is proposed and demonstrated to recover the transmittance object from Recovery speckle made possible by combining far-field intensity correlation with off-axis holography determine complex coherence function The desired which uniformly filtered using polarizer. results are compared case where determined in absence

Smooth control of the intrinsic orbital angular momentum (OAM) carried by a beam light is important for $e.g.$ optical tweezers, communication, and quantum information processing, while extrinsic OAM useful super-resolution microscopy light-matter interaction with atoms, molecules, condensates. This study presents technique to in single-path configuration that free from mechanical errors. By managing relative intensity Pancharatnam-Berry phase difference between two orthogonal spatial modes...

We propose a novel birefringent interferometer setup for the study of unfolding points, and obtain first time to our knowledge spatial polarization structure very near point uniformly polarized optical vortex beam propagating in crystal. The is reconstructed by folding back two separated eigen-beams at output crystal into single using another identical crystal, resulting Mach-Zehnder type. also demonstrate that separation can be varied small rotation second

A pair of stable noncanonical scalar vortices the same charge is generated experimentally across cross section an optical beam using a computer-generated hologram with higher-order fractional screw dislocation. The nature identified by gradient phase around each vortex and also crossing angle between zero contours real imaginary parts field. anisotropy controlled order hologram. behavior rate change individual found to be different from that earlier reports on vortices. observed experimental...

Optical vortex beams with fractional topological charges (TCs) are generated by the diffraction of a Gaussian beam using computer holograms embedded mixed screw-edge dislocations. When input has finite wave-front curvature, show distinct transformations in comparison to integer charge optical vortices. The at different TCs investigated through birth and evolution points phase singularity, azimuthal momentum transformation, occurrence critical transverse vorticity around singular points. This...

Abstract A technique based on the superposition of two uncorrelated speckle patterns and contrast measurement is proposed demonstrated to track polarization rotation an optical beam behind a scattering layer. One superposed considered as reference, it shown that with help reference pattern known linear polarization, possible layer in non-invasive manner by measuring resultant pattern. The working principle experimental demonstration are presented, results compared theoretically predicted...

We present what we believe to be the first experimental demonstration of anomalous spectral behavior such as shifts and switches due temporal correlation around intensity minima in a white-light interferometer. Unusual number fringes, measured within source bandwidth, function path delay between interfering beams is also reported. Experimental observations match well with spectra calculated by using interference law domain.

We report a novel experimental method to measure nanometer displacements using wavelength shifts of spectral peaks around switch or singular phase points in the interference spectra due temporal correlation Michelson interferometer illuminated by broadband white-light source. Dramatic changes characteristics are recorded as function path difference between interfering beams position. These then compared with measurements far from it order demonstrate higher sensitivities involved proposed method.

A new technique based on superposition of two speckle patterns is proposed and demonstrated for controlled modulation the spatial polarization distribution resultant speckle. It theoretically experimentally that laser can be achieved by proper choice states as well average intensity constituent speckles. shown useful to generate different with sinusoidal variation in their degree polarization, which tuned from zero unity. This find application sensing, biomedical studies, determining...

The propagation of a coherent beam light through random scattering medium results in the generation speckle pattern. Although intensity distribution pattern is nature, information object hidden behind scrambled into it. can be retrieved using off-axis holographic technique, where retrieval made from recorded interferogram, formed by superposition speckles and tilted reference In present paper, effect average number on signal-to-noise ratio investigated two different domains speckles, which...

In this Letter, we propose and experimentally demonstrate a new, to the best of our knowledge, non-interferometric highly stable technique unscramble incident orbital angular momentum (OAM) state quantitatively measure phase structure from non-imaged random light. A new theoretical basis is developed also verified by numerical simulation experimental demonstration. We investigate OAM modes light using orthogonal projection.

Spin-valley coupling in monolayer transition-metal dichalcogenides gives rise to valley polarization and coherence effect, limited by intervalley scattering caused exciton-phonon, exciton-impurity, electron-hole exchange interactions (EHEIs). We explore an approach tune the EHEI controlling exciton center of mass momentum (COM) utilizing photon distribution higher-order optical vortex beams. By virtue this, we have observed exciton-COM-dependent depolarization decoherence, which us ability...

We propose a mechanism of intravalley spin–flip scattering in spin–valley-coupled two-dimensional (2D) systems by transferring the momentum light into exciton center mass using optical vortex (OV) beams. By varying dispersion topological charge OV beam, we demonstrate unique approach to control rate excitons. From our photoluminescence measurements, that W-based TMDs can be tuned externally Variation intensity with charges shows crossover temperature (>150 K), indicating competition among...

Disorder-induced feedback makes random lasers very susceptible to any changes in the scattering medium. The sensitivity of lasing modes perturbations disordered systems has been utilized map regions perturbation. A tracking parameter that takes into account cumulative effect spatial distribution system defined locate region which a scatterer is displaced by few nanometers. We show numerically precision method increases with number modes. proposed opens up possibility application as tool for...

Spatial-polarization entangled beams can be generated by a coherent superposition of any pair orthogonal states in polarization and spatial modes. These have non-separability between orbital angular momentum degrees freedom. In the present work, common-path technique is proposed to generate classically beam. The effect birefringence on linear entropy scattered also investigated. results show that partially beam more sensitive than maximally find applications secured communication optical...

The topological transformation of optical vortex beams from fractional fork holograms induced by the modulation controlled Gouy phase (GP) is demonstrated. GP change tuned varying wavefront curvature input beam on plane generating optic. locus point singularity traces a semi-circle about axis for maximum possible associated GP. morphology parameters describing anisotropic phases generated vortices are in experiment curvature. Through transverse Poynting vector beams, control extrinsic...

We report here a detailed experimental study to demonstrate the effect of source spectral characteristics such as bandwidth (Deltalambda), peak wavelength (lambda(0)), and shape spectrum on shifts switches measured due temporal correlation in white-light Michelson interferometer operated domain. Behavior switch position, amplitude, symmetry are discussed detail function optical path difference between interfering beams. The results compared with numerical calculations carried out using...

The change of the spatial coherence-polarization (CP) property a speckle pattern due to modulation birefringence in scattering medium is investigated experimentally. introduced by attaching layers overhead projector (OHP) sheets it. It shown that polarization distribution can be tuned from uniformly polarized case randomly increasing number OHP sheets. CP with study degree coherence and polarization, these variations are further confirmed probability density function intensity measurement...

A different kind of intensity correlation, denoted as polarization-based correlation (PBIC), is proposed and demonstrated to investigate the between polarizations a depolarized speckle pattern (DSP), which has non-uniform spatial polarization distribution. It shown both theoretically experimentally that range PBIC for any DSP depends on average speckles corresponding particular polarization. The determined nature change components, due variation in intensity, found be matching well with...