Showing papers in "Optics Communications in 2004"

TL;DR: In this article, it was shown that light impinging on isolated subwavelength holes in real metal film, in this case Ag, excite localized surface plasmon modes on the aperture ridge, which gives rise to optical tunneling with unexpected enhanced transmission peaks and directionality.

TL;DR: In this paper, the authors identify the cross relaxation (CR) and energy transfer upconversion (ETU) processes that are important to the operation of Tm 3+ -doped silica fiber lasers using the slope efficiency measured from a number of diode-pumped Tm3+-doped laser arrays.

TL;DR: In this article, a high-speed dynamic focus control system based on a microelectromechanical mirror was designed to maintain high transverse resolution over the entire depth scan, which can yield sub-optimal lateral resolution outside the focal zone for deep-imaging OCT systems.

TL;DR: In this paper, an easy-to-handle relationship between the Pyramid Wave-Front Sensor (PWS) measurements and the wave-front phase is derived and the results are compared to an existing analytical model for the SHS.

TL;DR: In this paper, it was shown that the degree of polarization of a beam generated by an electromagnetic Gaussian Schell-model source which propagates through atmospheric turbulence tends to its value at the source plane with increasing distance of propagation.

TL;DR: In this paper, a few-mode fiber excited by a Laguerre-Gaussian beam is used to produce light beams with radial, azimuthal, and hybrid polarization.

TL;DR: In this article, a long-period grating refractometer based on a CO 2 laser was used to detect chemical compounds. But the results showed that the grating can not only differentiate chemicals based on their refractive index, but also become a concentration indicator of a particular chemical solution.

TL;DR: In this article, the relationship between two popular linear phase retrieval methods based on the Transport of Intensity equation and the first Born approximation, respectively, is clarified using a unified theoretical approach, and a new phase retrieval method combining the two techniques has a broader validity range, higher accuracy and stability compared to the same techniques used separately.

TL;DR: In this paper, the authors studied the properties of the field in the fundamental mode HE11 of a vacuum-clad subwavelength-diameter optical fiber using the exact solutions of Maxwells equations.

TL;DR: In this article, the optical, structural, and nonlinear optical properties of silver nanoparticles prepared by laser ablation in various liquids were investigated at 397.5, 532, and 795 nm.

TL;DR: In this paper, the first images of human skin and anterior chamber of the eye in vivo based on complex spectral optical coherence tomography are presented, which requires stability of the object during at least three consecutive measurements.

TL;DR: In this article, the validity of the variable stripe length (VSL) method to measure optical gain in semiconductor materials was discussed and the main experimental as well as conceptual difficulties arising when the VSL method is barely applied to low gain materials such as silicon nanocrystals (Si-nc) devised in a planar waveguide geometry.

TL;DR: In this paper, the optical properties of Cu(II) compound having 1-chloro-2,3-o-cyclohexylidinepropane thin film to determine optical constants (refractive index n, extinction coefficient k and dielectric constant e).

TL;DR: In this paper, a simple Erbium-doped fiber laser by using cascaded fiber Bragg gratings (FBGs) written in high-birefringence fibers for switchable multi-wavelength operation is proposed.

TL;DR: In this article, the generalized nonlinear Schrodinger equation with variable coefficients is considered from the integrable point of view, and an exact multi-soliton solution is presented by employing the simple, straightforward Darboux transformation based on the Lax Pair.

TL;DR: In this paper, the authors present a successful design, realisation and characterisation of single-mode TE00-TM00 rib optical waveguides composed of SU-8 polymer.

TL;DR: In this article, a miniature optical gyroscope based on a waveguide coupled sequence of whispering gallery mode microresonators is proposed, which is expected to be large due to large dispersion of the system.

TL;DR: In this paper, the input image to be encrypted is multiplied by a phase mask, and either its Fourier or fractional Fourier transform is obtained using interference with a wave from another random phase mask.

TL;DR: In this paper, the third-order nonlinear susceptibilities (χ(3)) and nonlinear refractive indices (n2) of KDP, BBO and LiNbO3 crystals were measured at the wavelengths of 1064 nm and 532 nm by Z-scan technique.

TL;DR: A lensless optical security system based on computer generated phase only masks that uses the wavelength and the position parameters besides the phase codes as additional keys and consequently achieves much higher security.

TL;DR: A numerical differentiation algorithm, namely, the backward Taylor series expansion and the digital signal processing technique are employed, for the first time, to develop a generalized theory of a pth-derivative FIR optical differentiator, capable of processing Gaussian pulses with high accuracy.

TL;DR: In this article, an all-optical Boolean XOR gate implemented with a SOA-based Mach-Zehnder Interferometer (SOA-MZI) is numerically simulated at 10 and 40 Gb/s to extract simple design rules.

TL;DR: This paper proposes a new method of the Lidar signal acquisition based on discrete wavelet transform (DWT), which can significantly improve the SNR so that the effective measured range of LIDar is increased.

TL;DR: In this paper, the morphology of secondary vortices is analyzed and the local orbital angular momentum of the nearest vicinity of an optical vortex core is shown to characterize the vortex anisotropy.

TL;DR: Tm3+ doped CaF2 single crystals have been grown and studied for their broadband absorption and emission properties as discussed by the authors, and they have been demonstrated for the first time around 1.9 μm.

TL;DR: In this article, a novel long-period fiber gratings (LPFGs) fabricated by using a new writing technique that is mainly based on the thermal shock effect of focused high-frequency CO2 laser pulses at several kHz are reported.

TL;DR: In this article, two closely spaced linear defect waveguides in a two-dimensional photonic crystal of air holes in a semiconductor matrix are numerically studied using plane wave expansion and finite difference time domain methods.

TL;DR: In this article, the authors compare two definitions of spatial chirp, which they call "spatial dispersion" and "frequency gradient" for Gaussian beams and pulses, and the relationship between the two definitions is found to be analogous to that between the definitions of time and frequency domains.

TL;DR: In this paper, the inhomogeneous nonlinear Schrodinger equation with the loss/gain and the frequency chirping is considered, and the N-solitary solution is presented by employing the Darboux transformation.

TL;DR: In this paper, a novel design technique for low-loss waveguide crossing using the self-imaging properties of multimode interference (MMI) structures is presented, which exploits the observation that optical fields with a small 1/e width relative to that of the MMI structure in the image reformed region experience negligible propagation loss even in the absence of lateral guiding mechanism around the region.