Showing papers in "Optics Communications in 2001"

TL;DR: In this paper, the authors demonstrate a technique for optical manipulation of micron-sized particles, including biological samples, using a zeroth-order Bessel light beam, which offers a non-diffracting focal line of light.

TL;DR: In this article, it was shown that the optical transmission through subwavelength holes in metal films can be enhanced by several orders of magnitude by enabling interaction of the incident light with independent surface plasmon (SP) modes on either side of the film.

TL;DR: Three different methods of phase retrieval from series of image measurements obtained at different defocus values are developed and compared, with an approximate solution to the transport of intensity equation (TIE) based on Fourier transforms using multigrid methods.

TL;DR: In this paper, a room temperature multiple Stokes and anti-Stokes picosecond generation in tetragonal YVO4 and GdVO4 host crystals for lasing trivalent lanthanides (Ln3+) has been observed for the first time.

TL;DR: An endoscope-compatible confocal laser scanning microscope (CLSM) for medical imaging is presented, which projects a magnified image on the distal end of a fiber-optic imaging bundle, which transfers the image to a CLSM situated at the proximal end.

TL;DR: In this article, a new type of permanent damage obtained in bulk fused silica by focusing IR femtosecond laser pulses with microjoule energy was reported, which consists of an uniaxial birefringence zone over a lateral size of a few microns and a depth of several tens of microns.

TL;DR: In this article, the generation of optical vortices by three plane waves interference is studied and the necessary conditions for such process are derived and the net structure of optical Vortices generated in this way is analyzed.

TL;DR: In this article, the authors studied the features of the closed-aperture (CA) Z-scan transmittance curves when the third-order nonlinear refraction and absorption, both of which can be independently positive or negative, are simultaneously present.

TL;DR: In this article, numerical results on femtosecond pulses in air including multiphoton ionization, group-velocity dispersion, space-time focusing, self-steepening, Raman response, and higher-order χ (5) defocusing are presented.

TL;DR: The first experimental observation of zero-order Mathieu beams in elliptic cylindrical coordinates was reported in this paper. But this was performed in the case of the wave equation.

TL;DR: In this article, the authors generalize a simple model describing second-harmonic generation (2HG) by highly focused excitation light to allow the possibility of sample inhomogeneities.

TL;DR: In this paper, the authors measured two-photon absorption (TPA) cross-sections of four organic molecules in solution and found that the nonlinear transmission method without consideration of other nonlinear effects results, under certain conditions, in erroneous values for the TPA crosssections.

TL;DR: In this paper, it was shown that by impinging radial polarization on a solid immersion lens (SIL) system, a rotational symmetric z-component of the focused wavefront with spot size similar to that predicted by scalar theory can be obtained.

TL;DR: In this article, the redistribution of laser power into higher energy pulses by means of a regenerative amplifier improves the TPEF depth penetration by two to three excitation scattering mean free paths.

TL;DR: The method developed can also be applied to the measurement of the warp of a small component under thermal loading and is capable of conducting fully automated measurements.

TL;DR: In this article, an extremely thin cell (ETC) with the thickness of Cs atomic vapour layer in the range of 150-300 nm has been developed for the first time, which can completely resolve each particular hyperfine transition of both 85 Rb and 87 Rb isotopes in D 2 line fluorescence spectrum.

TL;DR: In this article, a diode-end-pumped self-frequency-doubled (SFD) Yb:YAB laser was reported to achieve 1.1 W CW green output with a 10% optical conversion efficiency.

TL;DR: In this paper, it was shown that omnidirectional reflection is possible from quasi-periodic isotropic dielectric stacks following a Fibonacci sequence (FS).

TL;DR: A novel architecture of optical image encryption that uses cascaded multi-stages of fractional Fourier transforms with a random phase mask at each stage can result in a more secure image encryption with the addition of the extra degrees of freedom provided by the fractions of freedom.

TL;DR: In this paper, a laser diode transversely pumped compact, passively Q-switched, self-stimulating Nd 3+ :PbWO 4 /Cr 4+ :YAG Raman laser is proposed.

TL;DR: In this paper, the authors employed numerical field calculations to study quantitatively the wavelength-dependent interaction of visible light with nanometric holes in metallic screens and found that the transmission efficiency through holes in an ideally conducting screen of finite thickness was found to follow a power law as a function of wavelength with an exponent close to −4.

TL;DR: In this paper, the authors show that the process of nonlinear tunneling of optical solitons through a strong nonlinear thin film barrier exhibits jump-like nonadiabatic evolution, which eventually leads to the soliton "fission reactions".

TL;DR: In this article, a long-period grating (LPG) sensor is used to detect small variations in the concentration of an organic aromatic compound (xylene) in a paraffin (heptane) solution.

TL;DR: In this article, the authors demonstrate an all-fibre curvature sensor that uses two-core photonic crystal fiber (PCF) as the sensing element, in which phase difference is a function of curvature in the plane containing the cores.

TL;DR: In this article, the lateral and axial trapping efficiency of inverted optical tweezers with Gaussian and high-order Laguerre-Gaussian beams was investigated and it was shown that, for larger particles, the axial and lateral trapping efficiency was improved by using a LaguéreGaussian beam but, contrary to earlier suggestions, that the lateral efficiency was unchanged.

TL;DR: In this article, a novel technique is presented to measure displacement and temperature simultaneously with a single fiber bragg grating, which relies on attaching the FBG on a cantilever structure, so that the vertical displacement of the free end can be obtained by measuring the wavelength shift of FBG.

TL;DR: A new algorithm for fringe pattern normalization, that is, background suppression and modulation normalization is presented, based in the use of two orthogonal bandpass filters, from which a normalized irradiance distribution is obtained.

TL;DR: In this paper, the authors find general analytical bright and dark solitary wave solutions for the higher order nonlinear Schrodinger equation with cubic-quintic terms describing the effects of ultra-short (femtosecond) optical soliton propagation in non-Kerr media.

TL;DR: In this paper, the authors introduce a new direction in the field of atom optics, atom interferometry, and neutral-atom quantum information processing based on the use of microfabricated optical elements.