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Showing papers in "Optik in 1999"


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, a binary-phase diffractive optical element (DOE) is utilized to generate a couple of identical rotating (in a clockwise and counterclockwise direction) non-iffracting light beams.

39 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, the authors implemented the Mach-Zehnder geometry into a commercial microscope from Carl Zeiss Jena (JENATECH), which is equipped with a plane and spherical probe wavefront illumination.

36 citations


Journal Article
01 Jan 1999-Optik
TL;DR: High precision chromatic shift measurements in situ in cell nuclei are presented, opening the avenue to distance measurements far below the normal resolution limit.

36 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, the authors show that the width of laser beams is characterized by the second-order moment of the beam power density instead of beam intensity, and that this width is finite for any diffracted beam, and from the nonparaxial scalar approach of light beam propagation, that it follows a simple hyperbolic law of propagation.

21 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, the imaging characteristics of a birefringent lens sandwiched between two polarizers are studied analytically, and it is shown that the proposed system can be adapted either for apodization or for superresolution simply by rotating any of the two polarizer.

17 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, a general Transport of Intensit equation for paraxial optical wavefields in an arbitrary coherence state is derived, which provides an explicit relationship between the phase distribution in each monochromatic component of the beam and the propagation of its spectral density.

17 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, the general principle of automatic differentiation method for charged particle optics is given, and the aberration analysis of rotationally symmetric systems as well as deflection systems using AD method is thoroughly studied, and extraction of Gaussian properties and thirdorder geometric aberration coefficients from the AD results are obtained.

14 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, a high aperture theory based on a variation of the complex source point model in which combinations of sources and sinks are assumed in order to avoid singularities is presented. But the authors do not consider the higher order multipole modes.

13 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, the authors proposed a method for simultaneous determination of thicknesses and refractive indices of multi-layers using double beam interference microscopes with centrally obscured or annulus aperture lens.

11 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this article, a detailed comparison between the flattened Gaussian beam (FGB) and super-Gaussian beam (SGB) has been made and it has been shown that two FGB and SGB with the same M 2 -factor have the very similar field distribution and nearly same propagation characteristics in free space.

11 citations


Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, a model-based digital moire technique is presented, which makes use of a computer-generated sinusoidal fringe pattern as the projection grating and spatially parallel phase shift, as well as a robust phase unwrapping algorithm for automatic fringe analysis.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, simple holograms generating optical vortex are presented and the image given by such holograms is calculated numerically and analytically The theoretical results are verified by interferometric measurements.

Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, the optical absorption coefficient of amorphous cadmium oxide in the visible range was investigated. But the authors focused on the band-gap shift of this material.

Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, the authors suggest a novel device that may be constructed to obtain both negative or positive dispersion coefficient, based on the all diffractive achromatic Fourier transform setup.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, the Wigner distribution function approach was used to analyze light propagation in waveguides in two dimensions (fibers) by using the WIGNer Distribution Function approach and the results were simply reproduced by working in a four-dimensions phase space.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, the propagation in the morphologically significant plane is not significantly affected by the ellipticity of columnar cross-sections, which means that the design of devices using dielectric-magnetic MTIs is still not significantly impacted.

Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, a digital shadow moire technique is applied to obtain surface contours by adopting the concept of digital speckle pattern interferometry (DSPI) phase-shifting methods.

Journal Article
01 Jan 1999-Optik
TL;DR: Parallel-plate waveguides, bounded by perfectly conducting planes and filled with dielectric thin-film helicoidal bianisotropic mediums (TFHBMs), are shown to support guided wave propagation with characteristics dependent on the direction of propagation.

Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, a fiber optic four detector photopolarimeter (FOFDP) is proposed to measure the SOP of the lightwave as it travels along the fiber.

Journal Article
01 Jan 1999-Optik
TL;DR: The reduction of this handicap and of whatever kind other interesting results can be created with other integral transforms, is object of the following discourse.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, the diffraction efficiency of photorefractive gratings recorded in two-beam coupling configuration in crystals of BaTiO 3 and Ba TiO 3 :Ce at multiple wavelengths was studied.

Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, a double shear TV holographic system was presented to obtain the curvature fringes by incorporating phase shifting and image processing techniques, and the fringes were obtained by using phase shifting.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, the cross-spectral density at the Fraunhofer domain and the intensity distribution of the interferogram were investigated for non-regular 1-D gratings illuminated with a spatially partial coherent optical field.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, a simple technique for the determination of the complex transmittance of a spatial light modulator is described, which uses the variation of the diffraction efficiency of Ronchi gratings imprinted on the SLM, as a function of the grating contrast.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, lens aberrations are characterized in terms of the spherical and chromatic aberration of focal length f and focal distance g. The results are corroborated by computer data for electrostatic lenses and by experimental results.

Journal Article
01 Jan 1999-Optik
TL;DR: In this paper, a correlation output of a stone and tissue images, to guide the laser action is introduced, which increases the probability of stone recognition, rejection of the wall of the gall bladder and hence leads to increase in the safety of the laser lithotripsy.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, the resistance against additional noises of the higher order correlations is examined through a plausible model for the respective noises, and the possible significance of the excess coefficient are also discussed.

Journal Article
01 Jan 1999-Optik
TL;DR: An image and Fourier plane analysis of the polarization states of the readout wavefront transmitted through a photorefractive crystal when a non-holographic register of a binary object is produced is presented in this paper.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, the coherent and incoherent combinations of 1D off-axis Gaussian beams, including their M 2 -factor, power in the bucket and propagation through a first-order optical ABCD system have been studied in detail.

Journal Article
01 Jan 1999-Optik
TL;DR: In this article, multidimensional Fourier transforms of vector functions are considered and various relationships are presented, including those for differentiation, convolutions and correlations, and power and energy.