Geometric Optimization of a Cylindrical Plasma Adaptive Optics Lens

Neiswander, Brian; Matlis, Eric; Corke, Thomas

doi:10.2514/1.j052029

Cited by 7 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wall recombination has been neglected in writing k r in Eq. (13), which is a good approximation at the pressure levels considered here. 9…”

Section: A Conservation Equationsmentioning

confidence: 67%

“…In plasmas, a tunable refractive-index distribution can be achieved through concentration gradients in the population of free electrons. 7,[9][10][11][12][13][14][15] A brief explanation of this phenomenon is provided below.…”

Section: Introductionmentioning

confidence: 99%

“…The effects described above have been exploited in recent experiments [12][13][14][15] to manipulate light through capacitively coupled plasma lenses for aero-optical applications in the mTorr-pressure range. In the present study, however, focus is made on inductive coupling at near-atmospheric pressures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Computational hydrodynamics and optical performance of inductively-coupled plasma adaptive lenses

2015

View full text Add to dashboard Cite

This study addresses the optical performance of a plasma adaptive lens for aero-optical applications by using both axisymmetric and three-dimensional numerical simulations. Plasma adaptive lenses are based on the effects of free electrons on the phase velocity of incident light, which, in theory, can be used as a phase-conjugation mechanism. A closed cylindrical chamber filled with Argon plasma is used as a model lens into which a beam of light is launched. The plasma is sustained by applying a radio-frequency electric current through a coil that envelops the chamber. Four different operating conditions, ranging from low to high powers and induction frequencies, are employed in the simulations. The numerical simulations reveal complex hydrodynamic phenomena related to buoyant and electromagnetic laminar transport, which generate, respectively, large recirculating cells and wall-normal compression stresses in the form of local stagnation-point flows. In the axisymmetric simulations, the plasma motion is coupled with near-wall axial striations in the electrondensity field, some of which propagate in the form of low-frequency traveling disturbances adjacent to vortical quadrupoles that are reminiscent of Taylor-G€ ortler flow structures in centrifugally unstable flows. Although the refractive-index fields obtained from axisymmetric simulations lead to smooth beam wavefronts, they are found to be unstable to azimuthal disturbances in three of the four three-dimensional cases considered. The azimuthal striations are optically detrimental, since they produce high-order angular aberrations that account for most of the beam wavefront error. A fourth case is computed at high input power and high induction frequency, which displays the best optical properties among all the three-dimensional simulations considered. In particular, the increase in induction frequency prevents local thermalization and leads to an axisymmetric distribution of electrons even after introduction of spatial disturbances. The results highlight the importance of accounting for spatial effects in the numerical computations when optical analyses of plasma lenses are pursued in this range of operating conditions. V C 2015 AIP Publishing LLC.

show abstract

“…Wall recombination has been neglected in writing k r in Eq. (13), which is a good approximation at the pressure levels considered here. 9…”

Section: A Conservation Equationsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computational hydrodynamics and optical performance of inductively-coupled plasma adaptive lenses

2015

View full text Add to dashboard Cite

show abstract

“…An ionized gas can therefore be utilized for rapid production of the required OPD, due to the very fast response of electrons to external fields. The most simple adaptive optical element, a plasma lens, can be realized using an axially symmetric (cylindrical) discharge in which the density of electrons and thus the OPD can be controlled by an external applied voltage . An addressable array of such lenses covering a solid state mirror could be used to form a plasma‐based wavefront correction device, a plasma adaptive mirror, whose frequency response would be limited only by the plasma on/off times of the individual elements …”

Section: Emerging Application Fieldsmentioning

confidence: 99%

White paper on the future of plasma science for optics and glass

Šimek

Černák

Kylián

et al. 2018

Plasma Processes & Polymers

View full text Add to dashboard Cite

This paper reflects on the future of low-temperature plasma science in relation to the manufacturing and novel uses of glass. The text summarizes the current state of the art on the major topics discussed, such as glass processing, optics and photonics, healthcare issues, building and fenestration applications. It also identifies several challenges that are driven by applications, and which are compatible with roadmaps for their respective industries. The frontiers of plasma science are discussed, for example, in relation to the use of plasmas as an active optical element in fast-response adaptive optics systems, optical metamaterials, and the development of next-generation nanolithography. Future demand for the successful implementation of plasma-based technologies in the glass, optics, and photonic industries will depend on further progress in plasma science. Hence, some needs and recommendations concerning both fundamental and applied plasma research are summarized.

show abstract