Phase locking in two -dimensional laser arrays.
Item
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Title
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Phase locking in two -dimensional laser arrays.
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Identifier
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AAI3144158
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identifier
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3144158
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Creator
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Zhou, Yi.
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Contributor
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Adviser: Ying-Chin Chen
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Date
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2004
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Optics
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Abstract
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In this thesis, we document a study of phase locking in two-dimensional laser arrays through controlling the beam profiles in the far field of the emitters. The far-field beam profiles are accessed at the focal plane of a converging lens when the emitters are placed at the other focal plane in the self-imaging confocal resonator. The monolithic two-dimensional emitters are created in a neodymium-doped yttrium vanadate (YVO4) crystal through localized pumping using multiple diode laser beams delivered by a bundle of optical fibers. A spatial filter that matches the far-field pattern of the in-phase mode is used for mode selection. We have studied a four-element array forming a square pattern and a twelve-element array on an annulus. In both cases, the laser arrays operate stably in the in-phase mode with high efficiency. This is also the first time that a stable in-phase operation is achieved in two-dimensional laser arrays. Compared to the previously reported near-field techniques, the far-field approach involves much simpler beam profiles. The resonator has a higher efficiency and less sensitivity to the power variation among the emitters. The remedies to the effects of random time-dependent phase variations in the individual element on phase locking are also discussed.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
