Showing papers by "Y. R. Shen published in 1984"
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01 May 1984
TL;DR: In this article, the authors present a general description of wave propagation in nonlinear media, including high-resolution nonlinear optical spectroscopy, and four-wave mixing and mixing.
Abstract: Introduction. Nonlinear Optical Susceptibilities. General Description of Wave Propagation in Nonlinear Media. Electrooptical and Magnetooptical Effects. Optical Rectification and Optical Field-Induced Magnetization. Sum-Frequency Generation. Harmonic Generation. Difference Frequency Generation. Parametric Amplification and Oscillation. Stimulated Raman Scattering. Stimulated Light Scattering. Two-Photon Absorption. High-Resolution Nonlinear Optical Spectroscopy. Four-Wave Mixing. Four-Wave Mixing Spectroscopy. Optical-Field-Induced Birefringence. Self-Focusing. Multiphoton Spectroscopy. Detection of Rare Atoms and Molecules. Laser Manipulation of Particles. Transient Coherent Optical Effects. Strong Interaction of Light with Atoms. Infrared Multiphoton Excitation and Dissociation of Molecules. Laser Isotope Separation. Surface Nonlinear Optics. Nonlinear Optics in Optical Waveguides. Optical Breakdown. Nonlinear Optical Effects in Plasmas. Index.
5,311 citations
TL;DR: In this article, optical second-harmonic generation was used to study the local field enhancement due to surface roughness on various materials ranging from the alkalis to a semiconductor, and the results were used to predict some rather substantial enhancements for surface Raman scattering for a number of substrate materials.
Abstract: Optical second-harmonic generation was used to study the local-field enhancement due to surface roughness on various materials ranging from the alkalis to a semiconductor. The roughness morphology was standardized by evaporating each material onto the same chemically etched glass slide, having microstructures hundreds to thousands of angstroms in size. With the laser excitation at 1.06 ..mu..m, the observed second-harmonic enhancements for different materials varied from 27 to 1 x 10/sup -3/ times that of silver. They were in fair agreement with a simple model calculation assuming that the rough surface is composed of a distribution of noninteracting hemispheroids on a plane. The results are used to predict some rather substantial enhancements for surface Raman scattering for a number of substrate materials.
282 citations
TL;DR: In this paper, a second-harmonic generation was used to study the adsorption of atomic and diatomic species on a well characterized Rh(111) crystal surface in ultrahigh vacuum.
Abstract: Optical second-harmonic generation is used to study the adsorption of atomic and diatomic species on a well characterized Rh(111) crystal surface in ultrahigh vacuum. The results correlate well with those obtained by other surface probes.
136 citations
TL;DR: In this paper, a two-photon dichroism measurement is used for the first time to deduce the second nontrivial moment of the orientational distribution of 4-cyano-4\ensuremath{'}-pentylbiphenyl (5CB) in the nematic phase.
Abstract: A two-photon dichroism measurement is used for the first time to deduce the second nontrivial moment $〈 {P}_{4} 〉$ of the orientational distribution of 4-cyano-4\ensuremath{'}-pentylbiphenyl (5CB) in the nematic phase. An anisotropic local-field model is developed for the data analysis. The resultant temperature variation of $〈 {P}_{4} 〉$ is in fair agreement with that deduced from Raman depolarization measurements. The negative $〈 {P}_{4} 〉$ near the nematic-isotropic transition temperature is believed to be due to a strong ordering in the local structure of the medium.
30 citations
19 Jun 1984
TL;DR: In this paper, it is shown that surface second harmonic generation (SHG) is also an effective tool for surface studies using laser-induced fluorescence or resonant ionization can be used to probe angular, velocity, and internal energy distributions of molecules scattered or desorbed from a surface.
Abstract: The progress of surface science relies heavily on our ability to probe surfaces and interfaces For this purpose, many techniques have been developed in the past [1311 Recently, laser methods for material studies have advanced to a highly sophisticated level; one therefore wonders if they can also be applied to surface studies Indeed, there have been a number of very interesting recent discoveries in this area It is found that laser-induced fluorescence or resonant ionization can be used to probe angular, velocity, and internal energy distributions of molecules scattered or desorbed from a surface [1321 Coherent Raman spectroscopy [133], laser-induced desorption [134], photoacoustic spectroscopy [13, 5], and photothermal deflection spectroscopy [136] can be used to study surface states and molecular vibrations of adsorbates Lately, we have shown that surface second harmonic generation (SHG) is also an effective tool for surface studies [137] We describe here some of our recent work on this topic
2 citations