Showing papers by "Amnon Yariv published in 1978"
TL;DR: In this article, the possibility of using Bragg reflection in a cylindrical fiber to obtain lossless confined propagation in a core with a lower refractive index than that of the cladding medium is proposed and analyzed.
Abstract: The possibility of using Bragg reflection in a cylindrical fiber to obtain lossless confined propagation in a core with a lower refractive index than that of the cladding medium is proposed and analyzed.
833 citations
TL;DR: In this paper, nonlinear optical mixing can be used to perform a variety of new optical functions, as well as real-time holography, and the theory and some of the first experiments are described.
Abstract: Nonlinear optical mixing can be used to perform a variety of new optical functions, as well as real-time holography. The theory and some of the first experiments are described.
470 citations
TL;DR: In this paper, a generalized analysis of wave propagation in periodic layered media is applied to the special case of optical surface waves, confined to the interface between a periodic layered medium and a homogeneous medium, are formally analogous to electronic surface states in crystals.
Abstract: A generalized analysis of wave propagation in periodic layered media is applied to the special case of optical surface waves. These waves, confined to the interface between a periodic layered medium and a homogeneous medium, are formally analogous to electronic surface states in crystals. Single‐mode surface‐wave propagation along the surface of a GaAs‐AlGaAs multilayer stack (grown by molecular‐beam epitaxy) has been observed experimentally.
407 citations
TL;DR: In this paper, the authors considered the problem of forward Raman scattering process in a single transverse mode fiber and derived expressions for the maximum fiber loss and the minimum fiber length which allow significant pump to Stokes wave conversion.
Abstract: This paper considers the problem of forward Raman scattering process in a single transverse mode fiber. Both pump wave depletion and spontaneous scattering are considered in the analysis. Analytic solutions of the governing differential equations are obtained. We examine the conditions under which a nondepleted pump approximation is valid. Expressions are derived for the maximum fiber loss and the minimum fiber length which allow significant pump to Stokes wave conversion. It is shown that for a given fiber length there is an optimal pumping power, or at a given pump power there is an optimal fiber length that yields maximum first-order Stokes power output. Good agreement with published experimental results in the threshold power prediction is obtained.
167 citations
TL;DR: A nonlinear optical technique is described that performs the functions of spatial correlation and convolution of spatially encoded waves by mixing spatially dependent optical fields in the Fourier-transform plane of a lens system using a degenerate four-wave mixing scheme.
Abstract: A nonlinear optical technique is described that performs, essentially instantaneously, the functions of spatial correlation and convolution of spatially encoded waves. These real-time operations are accomplished by mixing spatially dependent optical fields in the Fourier-transform plane of a lens system. The use of a degenerate four-wave mixing scheme eliminates (in the Fresnel approximation) phase-matching restrictions and (optical) frequency-scaling factors. Spatial bandwidth-gain considerations and numerical examples, as well as applications to nonlinear microscopy, are presented.
125 citations
TL;DR: In this article, the authors report on the observation of amplified reflection and optical parametric oscillation via degenerate four-wave mixing in a nonresonant medium, mediated through the third-order nonlinear susceptibility in a transparent liquid medium, CS2.
Abstract: We report on the observation of amplified reflection and optical parametric oscillation via degenerate four‐wave mixing in a nonresonant medium. The process is mediated through the third‐order nonlinear susceptibility in a transparent liquid medium, CS2. A collinear mixing geometry is utilized to obtain long interaction lengths and polarization discrimination is used to separate the pump and signal fields.
93 citations
TL;DR: The four-wave optical mixing is an exact analog of the sequential operations of holographic recording and reconstruction as mentioned in this paper, and it should thus be possible to realize, in real time, holographic experiments and devices using such mixing.
87 citations
TL;DR: In this paper, the use of holographic interference lithography and various material removal techniques to corrugate thin-film optical waveguides is reviewed, and the specific applications of these periodic thinfilm devices in the distributed feedback and distributed Bragg reflector semiconductor laser, and as output grating couplers are described.
Abstract: In this paper, some of our recent work in the use of holographic interference lithography and various material removal techniques to corrugate thin-film optical waveguides are reviewed. The specific applications of these periodic thin-film devices in the distributed feedback and distributed Bragg reflector semiconductor laser, and as output grating couplers, are described. Recent results in the use and fabrication of chirped and curved-line gratings are also summarized.
76 citations
TL;DR: In this article, the integration of an injection semiconductor laser with an active electronic device (Gunn oscillator) in a single epitaxial crystal device is demonstrated, and the integration is shown to be successful.
Abstract: The integration of an injection semiconductor laser with an active electronic device (Gunn oscillator) in a single epitaxial crystal device is demonstrated.
63 citations
TL;DR: In this paper, it is proposed that real-time holography can be performed inside multimode fibers (or optical waveguides) using four-wave optical mixing, and a theoretical analysis and a numerical estimate are presented.
Abstract: It is proposed that real-time holography can be performed inside multimode fibers (or optical waveguides) using four-wave optical mixing. Of particular interest is the generation of complex-conjugate replicas of input fields for image transmission and compensation of propagation distortion. A theoretical analysis and a numerical estimate are presented.
61 citations
TL;DR: In this paper, a simple comprehensive model is developed to describe electron-beam interaction with an electromagnetic wave in periodic electromagnetic structures, which is general enough to describe both collective and single-electron modes of interaction and quantum mechanical, classical and Fermi degenerate regimes.
Abstract: The field of radiation emission from electron beams is reviewed with special reference to work related to free-electron lasers. Different schemes of interaction in periodic structures, electromagnetic slow-wave structures, and in transverse confining force are distinguished. Various effects and devices such as traveling wave amplifiers, Smith-Purcell radiators, Cerenkov and bremsstrahlung-free electron lasers, cyclotron resonance masers, coherent bremsstrahlung and channeling radiation are discussed and the differences and relations among them are explained. A simple comprehensive model is developed to describe electron-beam interaction with an electromagnetic wave in periodic electromagnetic structures. The model is general enough to describe both collective and single-electron modes of interaction and quantum mechanical, classical and Fermi degenerate regimes. Simplified expressions are developed for the gain by stimulated emission of radiation and for gain conditions of the Smith-Purcell-Cerenkov type free-electron lasers under conditions of very thin electron beams and infinite interaction length.
TL;DR: In this paper, optical surface waves propagating along the surface of a multilayer stack have been observed, and the transverse intensity distribution measured is found to agree with the theoretical calculation.
Abstract: Optical surface waves propagating along the surface of a multilayer stack have been observed. The multilayer stack is grown by liquid phase epitaxy. The transverse intensity distribution measured is found to agree with our theoretical calculation.
TL;DR: Ohmic contacts of AuGe have been produced on GaAs epilayers by laser alloying as mentioned in this paper, which possess morphological and electrical properties which are superior to those formed by conventional alloying.
Abstract: Ohmic contacts of AuGe have been produced on GaAs epilayers by laser alloying. The contacts possess morphological and electrical properties which are superior to those formed by conventional alloying.
Patent•
21 Jul 1978TL;DR: In this paper, two types of lasers, one operating on current crowding effect and the other by lateral diffusions, are integrated with an electronic device e.g. a Gunn oscillator or an FET on the common semi-insulating substrate to form a complex monolithic electro-optical device.
Abstract: Solid state electro-optical devices are formed on a semi-insulating substrate, with all contacts of each device being on the same side of the substrate. These devices include two types of lasers, one operating on current crowding effect and the other by lateral diffusions. Either type laser is integratable with an electronic device e.g. a Gunn oscillator or an FET on the common semi-insulating substrate to form a complex monolithic electro-optical device.
TL;DR: In this paper, low threshold GaAs-GaAlAs laser operating in a stable single mode has been fabricated using laterally diffused junctions and can be integrated with other components.
Abstract: Low‐threshold GaAs‐GaAlAs lasers operating in a stable single mode have been fabricated using laterally diffused junctions. The lasers are fabricated on semi‐insulating substrates and can be integrated with other components.
TL;DR: In this paper, the effects on reflectivity of a statistical variation in the thickness of layers in a multilayered Bragg reflector are studied, and the results of the computer experiment are presented in the form of p(ρρ*), the probability distribution function of the statistical Bragg reflectsor.
Abstract: The effects on reflectivity of a statistical variation in the thickness of layers in a multilayered Bragg reflector are studied. Analytic expressions are obtained for 〈ρ〉 and 〈ρρ*〉, the expected value of the reflection and reflectivity coefficients as a function of σ, the standard deviation in layer thickness. These expressions are then compared with values obtained using a computer routine which "builds" a reflector with the desired parameters and σ value, and then calculates the reflection. The results of the computer experiment are presented in the form of p(ρρ*), the probability distribution function of a statistical Bragg reflector. Finally, simple phenomenological expressions are presented for the reflectivity probability distribution.
TL;DR: Two structures of GaAs-GaAlAs heterostructures were fabricated on semi-insulating substrates and low-threshold single-mode operation was achieved as mentioned in this paper.
Abstract: Two structures of GaAs-GaAlAs heterostructures were fabricated on semi-insulating substrates Low-threshold single-mode operation was achieved The integration of a laser with an active electronic device (Gunn oscillator) on the same chip of GaAs was demonstrated
TL;DR: A GaAs-GaAlAs injection laser has been tested that confines light in the lateral dimension (normal to junction plane) by a multilayer Bragg reflector.
Abstract: A GaAs-GaAlAs injection laser has been tested that confines light in the lateral dimension (normal to junction plane) by a multilayer Bragg reflector. In the past, light has been confined as a result of the higher-index guiding region and resulting evanescent fields.
TL;DR: In this paper, light diffracted from a grating output coupler in a Ti-diffused LiNbO3 waveguide is scanned electro-optically using a coupling length of 2.5 mm.
Abstract: Light diffracted from a grating output coupler in a Ti‐diffused LiNbO3 waveguide is scanned electro‐optically. Using a coupling length of 2.5 mm in our arrangement we have demonstrated a scanning capability of one resolved spot per 3 V/μm applied field.
01 Jun 1978
TL;DR: In this article, nonlinear optical mixing can be used to perform a variety of new optical functions, as well as real-time holography, and the theory and some of the first experiments are described.
Abstract: Nonlinear optical mixing can be used to perform a variety of new optical functions, as well as real-time holography. The theory and some of the first experiments are described.