Showing papers in "Optics Communications in 1991"

TL;DR: A novel phase encoding method using deterministic orthogonal phase codes in a reference-based multiplexing technique is obtained that is able to retrieve multiple images with high diffraction efficiency without energy losses, adjustment problems or any time delay.

TL;DR: In this article, the integral transformation of Hermite-Gauss beams into Laguerre Gauss beams was investigated under the assumption of a laser beam transformation under astigmatism influence.

TL;DR: In this paper, a scanning transmission X-ray microscope with a 45 nm outer zone width and a 10% diffraction efficiency Fresnel zone plate as the probe-forming optic is presented.

TL;DR: In this article, a vector wave analysis of a Bessel beam is presented in which electric and magnetic field vectors satisfy Maxwell's equations, and the results are compared with those obtained in the scalar wave theory.

TL;DR: In this paper, the photonic band structure for electromagnetic waves in a structure that consists of a periodic array of parallel dielectric rods of circular cross section, whose intersections with a perpendicular plane constitute a square lattice.

TL;DR: In this article, the authors discussed the determination of the thickness and dielectric constant of thin layers by means of surface plasmon resonance and showed that it appears to be impossible to determine these parameters from one single surface-plasmon response experiment.

TL;DR: In this article, the authors calculate the delayed coincidence rate for photons transmitted by a driven cavity containing N two-level atoms and show that under cavity QED conditions (strong dipole coupling) the coincidence rate shows a nonclassical dependence on delay.

TL;DR: In this article, the phase distribution of the wavefront and the mean phase difference between two interfering beams from the series of interferograms used in conventional phase shifting technique, without any additional measurement.

TL;DR: In this article, a Fourier transform was used to separate the nuclear and non-resonant electronic contributions to the nonlinear-optical transient detected for transparent materials and applied to femtosecond optical heterodyne detected optical Kerr effect data.

TL;DR: In this paper, the modal structures of near-concentric laser resonators with a saturable gaussian gain and a Kerr nonlinearity are investigated numerically, and self-mode-locking should take place in unstable resonators and in some stable resonators.

TL;DR: In this paper, the authors considered a simple model of a four level atom as a candidate for laser action without population inversion and calculated the absorption profile of the laser transition and identified the conditions under which gain may develop.

TL;DR: In this article, a high contrast resonance formed due to coherent population trapping (Λ-resonance) has been observed in 87 Rb vapour by using two independent laser diodes.

TL;DR: In this paper, the authors investigated the nature of the quantum fluctuations in a light field created by the superposition of coherent fields in the direction of the x-quadrature, and showed that such a superposition can generate the squeezed vacuum and squeezed coherent states.

TL;DR: In this article, the authors reported room temperature, continuous-wave oscillation of Pr3+-doped fluorozirconate fiber lasers at around 491 nm, 520 nm, 605 nm and 635 nm.

TL;DR: In this article, it was shown that for paraxially propagating beams of any state of coherence, the width changes along the propagation axis with the same law as that of a gaussian beam.

TL;DR: In this article, the spectral changes produced on superposing partially coherent light emerging from two pinholes in Young's interference experiment were investigated and it was shown that drastic modifications in the spectrum can take place when the bandwidth of the incident light is sufficiently broad.

TL;DR: In this article, a parametric superradiant (resonator free) generation in nonlinear crystals of ZnGeP 2 and GaSe (type I phase matching) was obtained for the first time.

TL;DR: In this article, a photorefractive LiNbO3 crystal was used to construct an experimental filter and the wavelength selectivity and shift invariant properties of the filter were analyzed and experimentally verified.

TL;DR: In this article, the external cavity stabilization method for diode laser spectroscopy has been proposed, which requires an anti-reflection coating on one facet of the diode, but does not require any specialized equipment.

TL;DR: In this paper, it was shown that the emergence of gain is related to the existence of a population inversion between the upper level of the lasing transition and two of the lower lying dressed states.

TL;DR: In this article, the authors compare three different optical setups, which employ macro lenses and/or arrays of micro lenses, in the spirit of complexity theory, and provide an understanding of the scaling behavior of the three setups.

TL;DR: In this article, a new amplitude-modulated joint transform correlator (AMJTC) is proposed, which produces high auto-correlation peak intensity, compress the cross correlation and sidelobe intensities, and can be implemented by real time spatial light modulators (SLMs).

TL;DR: In this paper, the kinematic and dynamic properties of a waveguide FEL were described in the small signal small gain approximation in both the homogeneous and inhomogeneous regimes.

TL;DR: In this paper, spontaneous emission of an atom is not an immutable property of the atom but can be altered by modification of the vacuum field fluctuations surrounding the atom, and it has been shown that spontaneous emission can be enhanced by embedding the quantum wells between A1As/A1GaAs distributed Bragg reflectors.

TL;DR: In this paper, the authors reported the first time guided-wave second-harmonic generation in nonlinear optically active Langmuir-Blodgett (LB) films.

TL;DR: In this paper, the effect of beam walkoff on phase-matching was compared for type-II and type-I second harmonic generation (SHG) under the undepleted pump assumption based on the heuristic theory.

TL;DR: In this article, the spectrum of the beam reflected by a one-ended empty cavity was analyzed for the two cases in which the input corresponds to a squeezed vacuum, or to squeezed beam with a mean value much larger than the fluctuations.

TL;DR: In this article, the conditions needed for effective compression of SF pulses are found, and it is possible to produce SF pulses the duration of which is sufficiently smaller than the initial duration of the pump pulses and almost the total energy of the generator's pump pulses is converted into the SF wave.

TL;DR: In this paper, the authors studied the dynamical effects induced by a squeezed vacuum field interacting with the atoms of a standard single mode optical bistable system and showed that by varying the relative phase between the squeezed vacuum and the coherent input light one can force the system to switch from a low to a high transmission state and vice versa.

TL;DR: In this article, the authors investigated the near infrared dispersion of the third order nonlinear optical susceptibility, χ (3), of poly [5, 7-dodecadiyn-1, 12-diol-bis], poly (4-BCMU), by third-harmonic generation and two-photon absorption.