Browsing by Author "Vorontsov, M.A."
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Item Nonlinear Analysis of a High-Resolution Optical Wave-Front Control System(2001) Justh, Eric W.; Krishnaprasad, Perinkulam S.; Vorontsov, M.A.; ISR; CDCSSA class of feedback systems for high-resolution optical wave-front control(or adaptive optic wave-front distortion suppression) is modeled andanalyzed. Under certain conditions, the nonlinear dynamical system modelsobtained are shown to be gradient systems, with energy functions that also serve as Lyapunov functions. The approach taken here to a problemof nonlinear control system design and analysis might also be applicableto other problems involving high-resolution control of physical fields,particularly if the field sensing is performed optically.Proc. IEEE Conference on Decision and Control, pp. 3301-3306,2000. Item Opto-Electronic Zernike Filter for High-Resolution Wavefront Analysis using a Phase-Only Liquid Crystal Spatial Light Modulator(2001) Carhart, Gary W.; Vorontsov, M.A.; Justh, Eric W.; ISR; CDCSSAn opto-electronic technique for high-resolution wave-front phase imagingis presented and demonstrated experimentally. The technique is analogousto the conventional Zernike phase-contrast approach, but uses modernspatial light modulator technology to increase robustness and improveperformance.Because they provide direct measurements of wave-frontphase (rather than wave-front slope measurements, as in Shack-Hartmannsensors), robust phase-contrast sensors have potential applications inhigh-speed, high-resolution adaptive optic systems.
Advantages of theopto-electronic approach over alternative advanced phase-contrasttechniques (such as a related phase-contrast sensor which uses a liquid-crystal light valve exhibiting a Kerr-type optical response toperform Fourier filtering) are discussed. The SLM used for theexperimental results is a 128x128-element pixilated phase-only liquidcrystal spatial light modulator from Boulder Nonlinear Systems, Inc.
SPIE Proc., High-Resolution Wavefront Control: Methods,Devices, and Applications II, Vol. 4124, pp. 138-147, 2000.