Simulation of Im-Bessel beam propagation through time-correlated atmospheric turbulence

Ferlic, Nathaniel A.; Iersel, M. van; Davis, Christophér C.

doi:10.1117/12.2593738

Cited by 4 publications

(8 citation statements)

References 37 publications

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“…At low frequencies the PSD slope flattens out due to the phase correlation induced by the time-varying phase screen generation mimicking the effects of a mean flow velocity. 12 The PSD slope follows a −5/3 power law that is representative of a temporal measurement of turbulence containing a refractive index power spectrum slope of −11/3 which is expected from Kolmogorov phase screens.…”

Section: Gaussian Beam: L =mentioning

confidence: 94%

“…In contrast to most phase screen methods, the phase distortion generated in this experiment is optical turbulence that is assumed to be temporally correlated by modeling it as a first-order auto-regressive process. 12 This is motivated by the need to model the phase statistics of the beatnote in the time domain instead of using statistical ergodicity to transform a time domain average into an ensemble average. Generation of the turbulent phase screens is done using a randomized spectral sampling method to improve the low spatial frequency accuracy of each individual screen.…”

Section: Phase Distortion Generationmentioning

confidence: 99%

“…Wave-optic simulations are developed to model the photocurrent based on previous models implementing time-varying phase screens. 12 The model uses a split-step method implementing a single phase screen, similar to the single SLM in the experiment, and a modal decomposition detection method. The beam profile used in simulations is that created by the spiral phase hologram that creates a hypergeometric beam instead of an ideal Laguerre-Gaussian beam.…”

Section: Phase Distortion Generationmentioning

confidence: 99%

See 2 more Smart Citations

Radio frequency intensity modulation vs. heterodyne modulation on laser beams traversing a random optical phase distortion

Ferlic

Mullen

Laux

2023

Ocean Sensing and Monitoring XV

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In the underwater environment, scattering due to optical turbulence can degrade radio frequency (RF) information encoded on a laser beam's intensity profile and can limit the effectiveness of free-space optical communications. However, for sensing applications, changes in the RF subcarrier due to turbulence could be used to characterize the underwater environment. An alternative form of modulation can be created through heterodyne detection by interfering two co-propagating beams with different optical frequencies on an optical detector. This form of modulation was used to sense spatial properties of optical turbulence using beams carrying orbital angular momentum (OAM). Upon detection, each modulation method results in an oscillating photocurrent; however, it is not clear if the photocurrent produced by each modulation method responds differently to the effects of turbulence. To address how these modulation schemes may be affected by turbulence, a series of experiments are conducted. The results are analyzed to identify the impact of different charges of OAM relative to a Gaussian beam.

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Section: Gaussian Beam: L =mentioning

confidence: 94%

Section: Phase Distortion Generationmentioning

confidence: 99%

Section: Phase Distortion Generationmentioning

confidence: 99%

See 1 more Smart Citation

Radio frequency intensity modulation vs. heterodyne modulation on laser beams traversing a random optical phase distortion

Ferlic

Mullen

Laux

2023

Ocean Sensing and Monitoring XV

Self Cite

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show abstract

“…Both military and civilian sectors have pursued free space optical communications for these reasons, but the main challenge is the interaction between laser light and random media such as atmospheric turbulence. It has been suggested that partial coherence [4] can improve the deleterious effects of turbulence on the laser beam [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Underwater propagation of spatially partially coherent beams carrying orbital angular momentum

Akhtar,

Avramov-Zamurovic,

Nelson

et al. 2023

Ocean Sensing and Monitoring XV

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We consider the design and generation of spatially partially coherent (SPC) beams carrying orbital angular momentum (OAM) propagating through complex random media. It has been theoretically shown that spatial coherence can be controlled through a prescribed linear superposition of Laguerre-Gaussian (LG) modes. Experimentally the SPC beams are obtained by randomly cycling the phase screens of the coherent modes, with each mode contributing a weight that is proportional to its eigenvalue in the coherent mode decomposition equation. The spectral degree of coherence, ξ , theoretically varies from 0 (fully coherent) to 1 (incoherent). Experimentally, it is suggested that we can reach the highest level of incoherence when the modes are combined where LG mode orders are of equal weights. Preliminary measurements indicate a reduced coherence corresponding to increasing ξ. Our experimental design imposes turbulence on the beam to examine the effects of its spatial partial coherence on the scintillation index (SI). It has been shown that benefits to communication system performance, specifically underwater, can be achieved through the control of spatial coherence properties of laser light propagation.

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“…In [ 27 ], an experimental implementation of the Bessel-correlated beams as a superposition of coherent modes generated using a spatial light modulator was presented. Modeling of beam propagation with Bessel correlation through time-correlated atmospheric turbulence was presented in [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Nonparaxial Propagation of Bessel Correlated Vortex Beams in Free Space

Petrov

2022

Micromachines

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The nonparaxial propagation of partially coherent beams carrying vortices in free space is investigated using the method of decomposition of the incident field into coherent diffraction-free modes. Modified Bessel correlated vortex beams with the wavefront curvature are introduced. Analytical expressions are presented to describe the intensity distribution and the degree of coherence at different distances. The evolution of the intensity distribution during beam propagation for various source parameters is analyzed. The effects of nonparaxiality in the propagation of tightly focused coherent vortex beams are analyzed.

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Simulation of Im-Bessel beam propagation through time-correlated atmospheric turbulence

Cited by 4 publications

References 37 publications

Radio frequency intensity modulation vs. heterodyne modulation on laser beams traversing a random optical phase distortion

Radio frequency intensity modulation vs. heterodyne modulation on laser beams traversing a random optical phase distortion

Underwater propagation of spatially partially coherent beams carrying orbital angular momentum

Nonparaxial Propagation of Bessel Correlated Vortex Beams in Free Space

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