Results 121 to 130 of about 1,567 (171)
Recent Progress in Liquid Microlenses and Their Arrays for Adaptive and Applied Optical Systems. [PDF]
Micromachines (Basel)Lu S +6 more
europepmc +1 more source
Prism matching for piston segmentation correction with adaptive optics systems on extremely large telescopes [PDF]
2021 36th International Conference on Image and Vision Computing New Zealand (IVCNZ), 2021 Images observed at ground-based telescopes are blurred by Earth’s atmosphere. Adaptive optics systems can correct for this blurring by using a wavefront sensor to measure the instantaneous wavefront aberration created by the atmosphere, and a ...
Richard M Clare +2 more
exaly +3 more sources
Some of the next articles are maybe not open access.
Cross-fringe piston sensor for segmented optics
Applied Optics, 2022This paper presents a simple slit-mask-based sensing scheme that can be applied to a robust piston error sensor for segmented optical systems, even in space. Utilizing crossed fringes generated from multiple double-slit pairs, the sensor simultaneously detects multiple points in a segmented optical system in one shot. The experiments tested six pistons
Seichi Sato, Tadahito Mizutani
exaly +3 more sources
The LBTI Fizeau imager – II. Sensitivity of the PSF and the MTF to adaptive optics errors and to piston errors [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 peer reviewedWe show numerical simulations with monochromatic light in the visible for the LBTI Fizeau imager, including opto-dynamical aberrations due here to adaptive optics (AO) errors and to differential piston fluctuations, while other errors have ...
Denis Defrère +2 more
exaly +2 more sources
Physical Review A, 1986
We report an experimental and theoretical study of the optical piston, a consequence of the phenomenon of light-induced drift (LID), observed in binary mixtures of Na vapor and a buffer gas. Good agreement has been found between experiment and existing theory as far as the shape of the Na density profile in the piston is concerned.
, Werij, , Haverkort, , Woerdman
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We report an experimental and theoretical study of the optical piston, a consequence of the phenomenon of light-induced drift (LID), observed in binary mixtures of Na vapor and a buffer gas. Good agreement has been found between experiment and existing theory as far as the shape of the Na density profile in the piston is concerned.
, Werij, , Haverkort, , Woerdman
openaire +2 more sources
Journal of Modern Optics, 2001
Abstract Light-driven electron transitions between different traps in the direction opposite to an electric force eE (e is the electron charge and E is the static electric field) are studied. We show that in Ge-doped silica fibres the electrons are transfered predominantly between different Ge centres at concentrations ≥ 10 mol.% and dominate over the ...
V. B. Antonyuk, B. P. Antonyuk
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Abstract Light-driven electron transitions between different traps in the direction opposite to an electric force eE (e is the electron charge and E is the static electric field) are studied. We show that in Ge-doped silica fibres the electrons are transfered predominantly between different Ge centres at concentrations ≥ 10 mol.% and dominate over the ...
V. B. Antonyuk, B. P. Antonyuk
openaire +1 more source
Optics Communications, 1987
Abstract We report observation of an optical piston due to the effect of light induced drift in a rubidium-argon mixture. A tunable semiconductor diode laser is used for diagnostics of rubidium density and isotropic ratio. Sign and magnitude of the light induced drift effect depend directly on fine and hyperfine structure of rubidium.
W.A. Hamel, A.D. Streater, J.P. Woerdman
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Abstract We report observation of an optical piston due to the effect of light induced drift in a rubidium-argon mixture. A tunable semiconductor diode laser is used for diagnostics of rubidium density and isotropic ratio. Sign and magnitude of the light induced drift effect depend directly on fine and hyperfine structure of rubidium.
W.A. Hamel, A.D. Streater, J.P. Woerdman
openaire +1 more source
Thermo-optical piston in gases
AIP Conference Proceedings, 2014The new steady state of the gas – thermo-optical pressure difference is considered. This condition occurs in the gas that is in a closed capillary in the field of resonant laser radiation and a temperature gradient. The pressure difference at the ends of the capillary is determined by the interaction of three fluxes – thermal creep, the light-induced ...
I. V. Chermyaninov, V. G. Chernyak
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Physical Review Letters, 1999
Light-induced drift of optically active atoms in a buffer gas is a consequence of the unequal diffusive frictions suffered by the excited and the ground-state atoms. This drift can be used to create an "optical piston," which is best observed when the piston action is confined to a one-dimensional motion.
S. Dattagupta, R. Ghosh, J. Singh
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Light-induced drift of optically active atoms in a buffer gas is a consequence of the unequal diffusive frictions suffered by the excited and the ground-state atoms. This drift can be used to create an "optical piston," which is best observed when the piston action is confined to a one-dimensional motion.
S. Dattagupta, R. Ghosh, J. Singh
openaire +1 more source
Considerations about the differential piston for adaptive optics interferometry
SPIE Proceedings, 2000This contribution extends a previous work where the concept of piston angular anisoplanatism was introduced and the issue of sky-coverage for large ground-based optical interferometers was raised. We obtain expressions for the temporal power spectra of phase fluctuations caused by differential piston and photon noise.
Marcel Carbillet +2 more
exaly +2 more sources