The Experts below are selected from a list of 4764 Experts worldwide ranked by ideXlab platform
Gu Yuan - One of the best experts on this subject based on the ideXlab platform.
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Design of diffractive-phase axicon illuminated by a Gaussian-Profile Beam
1996Co-Authors: Zhang Guoqing, Yang Zhen-jun, Dong Zhen, Gu YuanAbstract:The diffractive-phase axicon can convert the Gaussian-Profile Beam into axial uniform intensity distribution with long focal depth and high lateral resolution. Two types of phase-retardation functions for the nonuniform-illuminating axicon are derived in terms of the ray tracing and the geometrical law of energy conservation. Based on the general theory of the amplitude-phase retrieval in optical system and the iteration algorithm, the optimization design of the phase distribution of the diffractive-phase axicon can be achieved. The simulation calculations show that the new approach may successfully offer the design of the desired diffractive-phase axicon with long focal depth and high lateral resolution. A comparison of the performances of the holographic axicon with the phase-retardation functions from the geometrical optics prediction and the diffractive-phase axicon designed by the new approach is also presented.
Zhang Guoqing - One of the best experts on this subject based on the ideXlab platform.
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Design of diffractive-phase axicon illuminated by a Gaussian-Profile Beam
1996Co-Authors: Zhang Guoqing, Yang Zhen-jun, Dong Zhen, Gu YuanAbstract:The diffractive-phase axicon can convert the Gaussian-Profile Beam into axial uniform intensity distribution with long focal depth and high lateral resolution. Two types of phase-retardation functions for the nonuniform-illuminating axicon are derived in terms of the ray tracing and the geometrical law of energy conservation. Based on the general theory of the amplitude-phase retrieval in optical system and the iteration algorithm, the optimization design of the phase distribution of the diffractive-phase axicon can be achieved. The simulation calculations show that the new approach may successfully offer the design of the desired diffractive-phase axicon with long focal depth and high lateral resolution. A comparison of the performances of the holographic axicon with the phase-retardation functions from the geometrical optics prediction and the diffractive-phase axicon designed by the new approach is also presented.
J R Jimenez - One of the best experts on this subject based on the ideXlab platform.
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a correction factor for ablation algorithms assuming deviations of lambert beer s law with a Gaussian Profile Beam
2012Co-Authors: Francisco Rodriguezmarin, E Hita, Rosario G Anera, Aixa Alarcon, J R JimenezAbstract:In this work, we propose an adjustment factor to be considered in ablation algorithms used in refractive surgery. This adjustment factor takes into account potential deviations of Lambert-Beer’s law and the characteristics of a Gaussian-Profile Beam. To check whether the adjustment factor deduced is significant for visual function, we applied it to the paraxial Munnerlyn formula and found that it significantly influences the post-surgical corneal radius and p-factor. The use of the adjustment factor can help reduce the discrepancies in corneal shape between the real data and corneal shape expected when applying laser ablation algorithms.
Tingchung Poon - One of the best experts on this subject based on the ideXlab platform.
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Gaussian Beam Profile shaping by acousto optic bragg diffraction
1994Co-Authors: Mark D Mcneill, Tingchung PoonAbstract:We study how Gaussian laser-Beam Profiles can be modified into a desired form using acousto-optic Bragg diffraction. By exploiting the angular dependence of Bragg diffraction of plane waves by acoustic gratings, we demonstrate that the conversion from a Gaussian-Profile Beam into either a near-field or a far-field flattop Profile is possible.
Yang Zhen-jun - One of the best experts on this subject based on the ideXlab platform.
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Design of diffractive-phase axicon illuminated by a Gaussian-Profile Beam
1996Co-Authors: Zhang Guoqing, Yang Zhen-jun, Dong Zhen, Gu YuanAbstract:The diffractive-phase axicon can convert the Gaussian-Profile Beam into axial uniform intensity distribution with long focal depth and high lateral resolution. Two types of phase-retardation functions for the nonuniform-illuminating axicon are derived in terms of the ray tracing and the geometrical law of energy conservation. Based on the general theory of the amplitude-phase retrieval in optical system and the iteration algorithm, the optimization design of the phase distribution of the diffractive-phase axicon can be achieved. The simulation calculations show that the new approach may successfully offer the design of the desired diffractive-phase axicon with long focal depth and high lateral resolution. A comparison of the performances of the holographic axicon with the phase-retardation functions from the geometrical optics prediction and the diffractive-phase axicon designed by the new approach is also presented.