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Roberto Ortega-martínez - One of the best experts on this subject based on the ideXlab platform.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses: Gaussian illumination and experiment
Journal of the Optical Society of America. A Optics image science and vision, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the spatiotemporal intensity of Gaussian temporal envelope pulses with initial durations of 200 fs and a carrier wavelength of 810 nm at the paraxial focal plane of an achromatic doublet lens for a well-collimated incoming pulse beam by using the Seidel Aberration theory for thin lenses with the stop at the lens. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for Gaussian illumination and present experimental results for 200 fs pulses focused by a near-IR achromatic doublet.
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Effects of Primary Spherical Aberration, coma, astigmatism and field curvature on the focusing of ultrashort pulses: homogenous illumination.
Journal of the Optical Society of America. A Optics image science and vision, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the spatiotemporal intensity of pulses with durations of 20 fs and shorter and a carrier wavelength of 810 nm at the paraxial focal plane of an achromatic doublet lens. The incident pulse is well-collimated, and we use the Seidel Aberration theory for thin lenses to evaluate the phase change due to the Aberrations of the lens. In a set of cemented thin lenses with the stop at the lens, there is only Spherical Aberration, coma, astigmatism and field curvature, whereas the distortion Aberration in the phase front is zero. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for homogenous illumination. We will show that the temporal spreading introduced by these Aberrations in pulses shorter than 20 fs at 810 nm is very small but the spatial spreading is not, which reduces the intensity of the pulse considerably.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses
22nd Congress of the International Commission for Optics: Light for the Development of the World, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the Gaussian temporal envelope of pulses with a duration of 20fs and a carrier wavelength of 810nm at the paraxial focal plane of an achromatic doublet lens. The incident pulse beam is well-collimated and we use the Seidel Aberration theory for thin lenses. In a set of cemented thin lenses with the stop at the lens, there is only Spherical Aberration, coma, astigmatism and field curvature. The distortion Aberration introduced by the lens is zero. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for homogenous illumination.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses: experimental results
22nd Congress of the International Commission for Optics: Light for the Development of the World, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the Gaussian temporal envelope of pulses with an initial duration of 200fs and a carrier wavelength of 810nm at the paraxial focal plane of an achromatic doublet lens designed in the IR region. The Seidel Aberrations for thin lenses are evaluated for a well-collimated beam. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for gaussian illumination and experimental results are presented for 200fs incident pulses and for three incident angles: 0°, 5°, and 8°.
Martha Rosete-aguilar - One of the best experts on this subject based on the ideXlab platform.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses: Gaussian illumination and experiment
Journal of the Optical Society of America. A Optics image science and vision, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the spatiotemporal intensity of Gaussian temporal envelope pulses with initial durations of 200 fs and a carrier wavelength of 810 nm at the paraxial focal plane of an achromatic doublet lens for a well-collimated incoming pulse beam by using the Seidel Aberration theory for thin lenses with the stop at the lens. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for Gaussian illumination and present experimental results for 200 fs pulses focused by a near-IR achromatic doublet.
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Effects of Primary Spherical Aberration, coma, astigmatism and field curvature on the focusing of ultrashort pulses: homogenous illumination.
Journal of the Optical Society of America. A Optics image science and vision, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the spatiotemporal intensity of pulses with durations of 20 fs and shorter and a carrier wavelength of 810 nm at the paraxial focal plane of an achromatic doublet lens. The incident pulse is well-collimated, and we use the Seidel Aberration theory for thin lenses to evaluate the phase change due to the Aberrations of the lens. In a set of cemented thin lenses with the stop at the lens, there is only Spherical Aberration, coma, astigmatism and field curvature, whereas the distortion Aberration in the phase front is zero. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for homogenous illumination. We will show that the temporal spreading introduced by these Aberrations in pulses shorter than 20 fs at 810 nm is very small but the spatial spreading is not, which reduces the intensity of the pulse considerably.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses
22nd Congress of the International Commission for Optics: Light for the Development of the World, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the Gaussian temporal envelope of pulses with a duration of 20fs and a carrier wavelength of 810nm at the paraxial focal plane of an achromatic doublet lens. The incident pulse beam is well-collimated and we use the Seidel Aberration theory for thin lenses. In a set of cemented thin lenses with the stop at the lens, there is only Spherical Aberration, coma, astigmatism and field curvature. The distortion Aberration introduced by the lens is zero. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for homogenous illumination.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses: experimental results
22nd Congress of the International Commission for Optics: Light for the Development of the World, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the Gaussian temporal envelope of pulses with an initial duration of 200fs and a carrier wavelength of 810nm at the paraxial focal plane of an achromatic doublet lens designed in the IR region. The Seidel Aberrations for thin lenses are evaluated for a well-collimated beam. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for gaussian illumination and experimental results are presented for 200fs incident pulses and for three incident angles: 0°, 5°, and 8°.
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Third-order dispersion effects generated by non-ideal achromatic doublets on sub-20 femtosecond pulses
Journal of Modern Optics, 2011Co-Authors: F. C. Estrada-silva, Jesús Garduño-mejía, Martha Rosete-aguilarAbstract:Gaussian temporal envelope pulses with initial durations of 10 fs, 15 fs and 20 fs and a carrier wavelength of 810 nm were analyzed at the paraxial focal plane of non-ideal achromatic doublet lenses for well-collimated incoming pulses parallel to the optical axis. The wave vector is expanded up to third order, to investigate the effect of third-order group velocity dispersion on the pulse and the results are compared to those obtained when the wave number is expanded up to second order. The propagation time difference and the Primary Spherical Aberration were included in the calculations using the thin lens approximation theory. Results are presented for a homogenous illumination beam.
D. J. Goldstein - One of the best experts on this subject based on the ideXlab platform.
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A quantitative computer simulation of microscopic imaging
Journal of Microscopy, 1991Co-Authors: D. J. GoldsteinAbstract:SUMMARY A versatile program is described for a BBC- or IBM-compatible microcomputer, which uses a fast Fourier transform in calculating diffraction-limited microscopic images. The defined ‘object’ can be a diffraction grating or a discrete specimen seen in cross-section, of arbitrary interval (or width), transmittance and retardation. Many microscopical techniques can be simulated including bright-field, phase contrast, central and peripheral dark-field, schlieren, apodization, fluorescence, differential interference contrast and confocal scanning. Instrumental settings which can be varied include the aperture, focus and Primary Spherical Aberration of the objective, the coherence and obliquity of the illumination, and in phase contrast the width, transmittance and retardation of the phase plate. The Fourier transform and various other algorithms used in the program are explained.
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Quantitative theory of ideal phase‐contrast microscopy, taking object width into account
Journal of Microscopy, 1991Co-Authors: D. J. GoldsteinAbstract:SUMMARY In ‘ideal’ phase-contrast microscopy all the direct light and none of the diffracted light is influenced by the phase plate in the back focal plane of the objective. Contrary to almost all previous work, it appears that the intensity of an ideal phase-contrast image is affected not only by the transmittance and retardation of the object and of the phase plate, but also by the width of the specimen (or total width of multiple specimens) relative to the microscopic field. Equations and computer code are presented with which the intensity of such images can be calculated. Previously published equations are special cases, and implicitly or explictly assume either that the object is of negligible width, or occupies precisely half the microscopic field. The absolute brightness of an image in ideal central dark-field microscopy is a function of the object retardation, but the intensity of the image relative to the background is a function only of the width of the object(s) relative to the field. The equations give results for ideal phase-contrast microscopy identical with those of a computer program simulating microscopic imaging. The program can in addition take into account non-ideal factors including a finite width of phase plate, finite objective aperture, deviations from best focus, glare, Primary Spherical Aberration and obliquity of the coherent illumination.
M. A. González-galicia - One of the best experts on this subject based on the ideXlab platform.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses: Gaussian illumination and experiment
Journal of the Optical Society of America. A Optics image science and vision, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the spatiotemporal intensity of Gaussian temporal envelope pulses with initial durations of 200 fs and a carrier wavelength of 810 nm at the paraxial focal plane of an achromatic doublet lens for a well-collimated incoming pulse beam by using the Seidel Aberration theory for thin lenses with the stop at the lens. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for Gaussian illumination and present experimental results for 200 fs pulses focused by a near-IR achromatic doublet.
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Effects of Primary Spherical Aberration, coma, astigmatism and field curvature on the focusing of ultrashort pulses: homogenous illumination.
Journal of the Optical Society of America. A Optics image science and vision, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the spatiotemporal intensity of pulses with durations of 20 fs and shorter and a carrier wavelength of 810 nm at the paraxial focal plane of an achromatic doublet lens. The incident pulse is well-collimated, and we use the Seidel Aberration theory for thin lenses to evaluate the phase change due to the Aberrations of the lens. In a set of cemented thin lenses with the stop at the lens, there is only Spherical Aberration, coma, astigmatism and field curvature, whereas the distortion Aberration in the phase front is zero. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for homogenous illumination. We will show that the temporal spreading introduced by these Aberrations in pulses shorter than 20 fs at 810 nm is very small but the spatial spreading is not, which reduces the intensity of the pulse considerably.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses
22nd Congress of the International Commission for Optics: Light for the Development of the World, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the Gaussian temporal envelope of pulses with a duration of 20fs and a carrier wavelength of 810nm at the paraxial focal plane of an achromatic doublet lens. The incident pulse beam is well-collimated and we use the Seidel Aberration theory for thin lenses. In a set of cemented thin lenses with the stop at the lens, there is only Spherical Aberration, coma, astigmatism and field curvature. The distortion Aberration introduced by the lens is zero. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for homogenous illumination.
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Effects of Primary Spherical Aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses: experimental results
22nd Congress of the International Commission for Optics: Light for the Development of the World, 2011Co-Authors: M. A. González-galicia, Martha Rosete-aguilar, Jesús Garduño-mejía, Neil C. Bruce, Roberto Ortega-martínezAbstract:We analyze the Gaussian temporal envelope of pulses with an initial duration of 200fs and a carrier wavelength of 810nm at the paraxial focal plane of an achromatic doublet lens designed in the IR region. The Seidel Aberrations for thin lenses are evaluated for a well-collimated beam. We analyze the effect of these Aberrations in the focusing of ultrashort pulses for gaussian illumination and experimental results are presented for 200fs incident pulses and for three incident angles: 0°, 5°, and 8°.
Virendra N. Mahajan - One of the best experts on this subject based on the ideXlab platform.
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Symmetry properties of aberrated point-spread functions
Journal of the Optical Society of America A, 1994Co-Authors: Virendra N. MahajanAbstract:The symmetry properties of point-spread functions of optical imaging systems with circular pupils aberrated by a Zernike-circle polynomial Aberration were discussed by Nijboer [ “ The diffraction theory of Aberrations,” Ph.D. dissertation ( University of Groningen, Groningen, The Netherlands, 1942)]. Although it was not pointed out by him, his analysis and some of his results are valid only for systems with large Fresnel numbers. The symmetry properties for systems with small and large Fresnel numbers are discussed. The analysis is extended to systems with annular pupils aberrated by a Zernike-annular polynomial Aberration. This analysis is further extended to pupils with nonuniform but radially symmetric illumination such as Gaussian. It is shown, in particular, that whereas, for uniform pupils, the axial irradiance of the imaging-forming light cone for a Primary Spherical Aberration is symmetric about the defocused point with respect to which the Aberration variance is minimum, it is asymmetric for nonuniform pupils. The discussion is equally valid for focused beams of light. Computer-generated pictures of point-spread functions of systems with circular and annular pupils aberrated by Primary Aberrations illustrating their symmetry properties are given.