Showing papers in "Optics Communications in 2000"

TL;DR: In this article, a novel radially polarized instead of a linearly polarized light annulus was proposed to reduce the focal area of a high aperture lens, which achieved an even smaller focal area, which is determined by the contour of the intensity distribution at half the maximum value.

TL;DR: In this paper, the authors demonstrate and analyse a method for efficiently generating a high-order Bessel beam of arbitrary order by illuminating an axicon with the appropriate Laguerre-Gaussian light beam.

TL;DR: In this paper, the amplification of near-field Raman scattering by using an apertureless near field scanning optical microscope the tip of which is a 40 nm silver-layer-coated cantilever of an atomic force microscope was observed.

TL;DR: In this paper, the authors show that the coupling of probe dipole and its image in the sample causes a steep increase of scattering cross-sections at small probe-sample distances.

TL;DR: In this paper, the authors used a liquid crystal display (LCD) to display the holograms and demonstrated the controllability of trapped particles in three dimensions without the need for mechanical elements in the setup.

TL;DR: In this article, a resonant cavity-enhanced light transmission mechanism in metallic gratings with subwavelength apertures is theoretically interpreted for operation with visible light and it is shown that under appropriate boundary conditions, the aperture behaves as open Fabry-Perot resonant cavities delivering a high photon flux, and that the coupling between the incident light and the fundamental mode supported by the aperture is strongly controlled by surface waves.

TL;DR: In this article, a few versions of effective medium theories that have been suggested as size dependent extensions of the Maxwell-Garnett theory are compared and the degree to which the different theories satisfy a physical consistency criterion is evaluated.

TL;DR: In this article, the density and decay kinetics of a plasma channel created in air by a self-guided intense ultra-short laser pulse are determined by a new electric cross-conductivity method and by diffraction interferometry.

TL;DR: In this paper, the trajectory of the Poynting vector for light of any polarisation was investigated using the local linear momentum density in Laguerre-Gaussian beams.

TL;DR: In this paper, the breakdown threshold intensities were measured for the range of pressure from 150 to about 3040 Torr, and the results showed that the pressure dependence of breakdown threshold is I thr ∝ p − n which is in agreement with the inverse bremsstrahlung absorption process creating breakdown.

TL;DR: In this paper, a new technique for optical coherence tomography imaging with spatially low-coherent light sources is presented, in which the low coherence interferometry (LCI) depth-scan is performed by the image of the light source, and therefore, simultaneously by a multitude of mutually incoherent LCI channels, to increase the probe beam power.

TL;DR: In this article, Hecht et al. describe the cell design and construction and demonstrate a range of focal lengths from +490 to +1000 μm for 2 to 12 V applied.

TL;DR: In this paper, the spectral density function of resonances is determined and its behavior is analyzed at different values of a parameter specifying the composite topology, which is not reduced to the Bruggeman topology but may be represented as a spheroid system.

TL;DR: In this article, a simple analytic expression describing the field of various orders of Bessel light beams produced by an axicon is obtained, and the focusing properties of an Axicon are discussed.

TL;DR: In this article, the first and second harmonic output of a mode-locked Nd:YAG laser system was used as a pump source for the generation of the frequency shifted Raman laser pulses.

TL;DR: In this paper, the authors describe the application of a new technique for the simultaneous determination of three-dimensional absorption and refractive index distributions using a combination of quantitative phase-amplitude microscopy and tomographic reconstruction techniques.

TL;DR: In this paper, an adiabatic technique is proposed to transfer non-classical correlations from traveling-wave single-photon wavepackets into atomic states and vise versa with nearly 100% efficiency.

TL;DR: In this paper, a method of recording four quadrature-reference-wave-holograms by CCD and reconstructing the object wave front by numerical calculation is presented, where the terms of direct transmitting, auto-correlation and conjugate wave in the four reconstructing waves are cancelled out and only the original object wave is left after overlapping.

TL;DR: In this article, a linear and ring Raman oscillator based on PbWO 4 was demonstrated in lead tungstate in the nanosecond regime, where the resonators were pumped by the fundamental and second harmonic wavelengths, respectively, of a Q-switched Nd 3+ :Y 3 Al 5 O 12 laser.

TL;DR: In this article, a variational approach is used to solve the multidimensional, inhomogeneous, nonlinear Schrodinger equation and spatiotemporal solitons can be stabilized under certain conditions.

TL;DR: In this article, a new mechanism for trapping metallic particles in inverted optical tweezers is proposed, where the particles are loosely confined, in three dimensions, to an annular region just below the beam waist where gravity is counterbalanced by the scattering force.

TL;DR: In this paper, the dynamics of a high power Yb3+-doped double-clad fiber laser in various optical configurations operating in the 1.08 μm wavelength were investigated.

TL;DR: In this paper, it was shown that the design wavelength of the filter can be tuned by a modest amount by tilting the filter with respect to the incident beam, theoretically as well as experimentally.

TL;DR: In this paper, the authors present experimental results on the measurement of third-order optical nonlinearity in the ns and ps domain, in several Tetra Tolyl Porphyrin molecules (TTP) using degenerate four wave mixing (DFWM) and Z-Scan techniques.

TL;DR: In this article, the dependence of the dynamical characteristics of an optically injected semiconductor laser on its intrinsic and operational parameters is studied and the effect of the injection current on the dynamics of the system is indirect through the differential gain effect and nonlinear gain effect.

TL;DR: In this article, a low-loss system for generating intensity patterns suitable for the trapping and manipulation of small particles or specimens is presented, which offers numerous advantages over current techniques involving the use of computer generated holograms or diffractive optical elements.

TL;DR: In this paper, a quantum eraser is used to achieve large fringe visibility in sorted subensembles, where the achieved visibility depends on the specific sorting scheme and the sorting procedure under general circumstances.

TL;DR: In this article, the spatial coherence of the electromagnetic field emitted by a half-space at temperature T close to the interface was analyzed and three different contributions to the cross-spectral density tensor were identified: thermally excited surface waves, skin-layer currents and small-scale polarization fluctuations.

TL;DR: In this article, an erbium-doped fiber laser was used for simultaneous multi-wavelength lasing, where the authors demonstrated that polarization hole burning can be enhanced by the changes of the light polarization states and bias current of optical MQW waveguide which serves as reflector in the laser.

TL;DR: In this paper, the coherent population trapping on the D and D lines of Rb at a 12 single hyperfine transition using the Zeeman sublevels of the hyperfine states is reported.