Showing papers in "Optics Communications in 1993"

TL;DR: In this paper, a mode converter based on the Gouy phase was proposed to transform a Hermite-gaussian mode of arbitrarily high order to a Laguerre-Gaussian mode and vice versa.

TL;DR: In this paper, the screw dislocations of different charges produced by diffraction on the computer-synthesized grating or by nonlinear processes of second- harmonic generation are experimentally studied and discussed.

TL;DR: In this article, Fourier transforms of fractional order a are defined in a manner such that the common Fourier transform is a special case with order a = 1 and an optical interpretation is provided in terms of quadratic graded index media and discussed from both wave and ray viewpoints.

TL;DR: In this article, an absolute optical frequency measurement of the hyperfine components of the 5S 1 2 -5D 3 2 two-photon transitions in rubidium with an uncertainty of 1.3×10-11.

TL;DR: In this paper, a new method for phase-stepping grating profilometry of complex objects is proposed and verified by experiments, where both the discrete phase distribution and the modulation depth distribution are calculated.

TL;DR: In this article, a simple product wave function is proposed to describe an arbitrary dislocation network, and the phase maps predicted by this wave function are tested against measured interferograms for a variety of different dislocations.

TL;DR: In this article, a nonlinear ABCD matrix derived from the aberrationless theory of self-focusing is introduced to treat the propagation of gaussian beams in materials with Kerr nonlinearity.

TL;DR: In this article, a water window (λ = 2.3-4.4 nm) laser-plasma X-ray source which uses ethanol droplets as target is described.

TL;DR: In this paper, a modified equation describing the laser field in a passively mode-locked laser is presented, which includes a fast saturable absorber which is bleached only over a limited intensity-range.

TL;DR: In this article, high-order harmonic spectra which are flat over 20 eV were generated using intense laser pulses, and this bandwidth corresponds to temporal pulses on the order of ∼ 5 × 10-17 s, and thereby motivated a search for a new regime of short-pulse generation.

TL;DR: In this article, two radiofrequency ion traps are presented, a Paul-Straubel type ion trap, and an ion trap which essentially consists of two endcaps, the "endcap trap".

TL;DR: Stimulated Raman scattering (SRS) of picosecond pulses was investigated in Ba(NO3)2 crystals as mentioned in this paper, and the results were in good agreement with transient SRS theory.

TL;DR: In this article, two-dimensional simulation results are presented for the case of an intense ultrashort laser pulse propagating through an initially neutral high-pressure gas, where the combined effects of diffraction and ionization lead to self-defocusing of the pulse, which reduces the peak intensity from its vacuum value and restricts the maximum achievable plasma density.

TL;DR: In this article, the laser guiding of atoms in a hollow optical fiber is discussed, and it is shown that for reasonable laser power 1W, the use of atomic guidance in an optical waveguide allows an atomic flow to be transmitted without any substantial loss over a distance of about ten meters.

TL;DR: In this article, the authors used real time measurements of the spectral transmission, of the fwhm bandwidth and of the resonance wavelength of the Bragg gratings to estimate the refractive index change photoinduced in the core of the fiber.

TL;DR: In this paper, the ABCD law is extended to resonators of femtosecond self-mode-locked solid-state lasers containing a self-focusing Kerr medium, and simple closed-form results valid for arbitrary resonator configurations are obtained and criteria for designing and optimizing resonators for selfmode locked lasers are discussed.

TL;DR: In this paper, the existence of spiral-type light fields, which remain unchanged under propagation intensity neglecting scale and rotation, has been shown by theoretical means, and the connection between the beam shaping problem and obtained results is considered.

TL;DR: In this article, a new optical reflectometer based on low-coherence interferometry that employs no moving parts was proposed, and depth profiling up to a maximum free-space distance of 300 μm (150 μm depth) was achieved with a spatial resolution of 23 μ.

TL;DR: In this article, the advantages of wavelength multiplexed reflection type holograms are discussed and it is shown that the wavelength multiple-xed holograms offer a more uniform selectivity over all the construction angles, as compared with the angularly multiple-axed crystal holograms.

TL;DR: In this paper, a system is derived of differential equations which applies to two-dimensional periodic structures and can be solved by an extension of a technique suggested for the diffraction analysis of one-dimensional gratings, which is usually referred to as coupled-wave method.

TL;DR: In this article, photorefractive self-pumped phase-conjugation is examined at near-infrared wavelengths using doped BaTiO 3, and reflectivities are reported as high as 76% between 720 nm and 1004 nm due, as is believed, to a backward stimulated photore-fractive scattering mechanism.

TL;DR: In this article, the evanescent electromagnetic wave of optically excited surface plasmons was measured directly using a scanning tunneling optical microscope (STOM) setup, and the measured intensity was increased by a factor of 30 larger than the corresponding wave intensity on a bare glass surface.

TL;DR: In this article, a two-color stimulated Raman effect was used to generate a shorter optical pulse at terawatt levels based on a simple optical system, which is essential in studies on ultrafast phenomena and nonlinear spectroscopy.

TL;DR: In this article, the first experimental results on transverse pattern formation with a liquid crystal light valve under optical feedback were presented, where the setup was reduced to the essential elements, retaining maximum symmetry.

TL;DR: In this article, a Ti: sapphire ring laser capable of providing 1.4 W of single mode output at 800 mn with 10 W of Ar+ pump power is developed.

TL;DR: In this article, an optical frequency synthesis chain was built from a laboratory-measured reference at 29 THz (CO2/OsO4 laser) and the frequency of a HeNe laser locked on a hyperfine transition of iodine at 473 THz.

TL;DR: In this paper, a novel oscillator was developed as a driver producing ≈ ps pulses at 105 nm, which was stretched prior to amplification and compressed at an aperture of 150 mm.

TL;DR: In this paper, the authors derive the expansion of a cylindrical wave into plane waves and give some examples of applications, such as the application of diffraction theory to plane wave propagation, where the product of a Hankel function of integer order times a sinusoidal angular factor is considered.

TL;DR: Second order diffraction has been observed from Bragg gratings written within germanosilicate glass fibres as discussed by the authors, which is consistent with a saturation in the photo-induced change in refractive index.

TL;DR: In this article, it was shown that a geometric phase may accompany transformations of gaussian light beams, and whether this phase can be interpreted as resulting from transfer of orbital angular momentum.