About: Waveguide (optics) is a research topic. Over the lifetime, 44965 publications have been published within this topic receiving 618942 citations. The topic is also known as: lightguide & waveguide.
TL;DR: In this paper, an experimental technique using powders is described which permits the rapid classification of materials according to the magnitude of nonlinear optical coefficients relative to a crystalline quartz standard and the existence or absence of phase matching direction(s) for second-harmonic generation.
Abstract: An experimental technique using powders is described which permits the rapid classification of materials according to(a) magnitude of nonlinear optical coefficients relative to a crystalline quartz standard and(b) existence or absence of phase matching direction(s) for second‐harmonic generation.Results are presented for a large number of inorganic and organic substances including single‐crystal data on phase‐matched second‐harmonic generation in HIO3, KNbO3, PbTiO3, LiClO4·3H2O, and CO(NH2)2. Iodic acid (HIO3) has a nonlinear coefficient d14∼1.5×d31 LiNbO3. Since it is readily grown from water solution and does not exhibit optical damage effects, this material should be useful for nonlinear device applications.
TL;DR: In this paper, optical resonance and two-level atoms have been studied in terms of two level atoms, and two level atoms have been shown to have similar properties to two-layer atoms.
Abstract: (1975). Optical Resonance and Two-level Atoms. Optica Acta: International Journal of Optics: Vol. 22, No. 12, pp. 1041-1042.
TL;DR: A laser cavity formed from a single defect in a two-dimensional photonic crystal is demonstrated and pulsed lasing action has been observed at a wavelength of 1.5 micrometers from optically pumped devices with a substrate temperature of 143 kelvin.
Abstract: A laser cavity formed from a single defect in a two-dimensional photonic crystal is demonstrated. The optical microcavity consists of a half wavelength–thick waveguide for vertical confinement and a two-dimensional photonic crystal mirror for lateral localization. A defect in the photonic crystal is introduced to trap photons inside a volume of 2.5 cubic half-wavelengths, approximately 0.03 cubic micrometers. The laser is fabricated in the indium gallium arsenic phosphide material system, and optical gain is provided by strained quantum wells designed for a peak emission wavelength of 1.55 micrometers at room temperature. Pulsed lasing action has been observed at a wavelength of 1.5 micrometers from optically pumped devices with a substrate temperature of 143 kelvin.
TL;DR: The asymmetric slab waveguide weakly guiding optical fibers coupled mode theory applications of the coupled power theory theory of the directional coupler grating-assisted direction couplers approximate and numerical methods nonlinear effects as discussed by the authors.
Abstract: The asymmetric slab waveguide weakly guiding optical fibers coupled mode theory applications of the coupled mode theory coupled power theory theory of the directional coupler grating-assisted direction couplers approximate and numerical methods nonlinear effects.