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Oxford University Press eBooks

Stimulated Scattering of Intense Coherent Light

Guang S. He

Published Oct 30, 2014• 1 citation
Publisher

Abstract

When a high-intensity laser beam passes through a transparent and homogeneous optical medium, the induced light scattering may manifest the properties of stimulated radiation characterized by threshold requirement, high directionality, and high brightness. This is the stimulated scattering of intense coherent light. Discoveries and studies of various types of stimulated scattering effects have provided a much deeper and more comprehensive understanding of interactions between the intense coherent light and matter. On the other hand, devices based on stimulated Raman scattering, stimulated Brillouin scattering, and stimulated spin-flip Raman scattering can be employed as highly efficient tunable frequency shifters of coherent light. Stimulated Kerr scattering can be used to generate a super-broadband coherent light and to investigate the molecular anisotropy of liquids. In addition, the recently developed stimulated Rayleigh–Bragg scattering and stimulated Mie scattering can significantly reduce the threshold requirement, and provide a highly efficient no-frequency-shift optical phase conjugation wave.

DOI
10.1093/acprof:oso/9780198702764.003.0007

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Journal of the Optical Society of America B•Apr 17, 2007•9 citations
When a high-intensity laser beam passes through a transparent and homogeneous optical medium, the induced light scattering may manifest the properties of stimulated radiation characterized by threshold requirement, high directionality, and high brightness. This is the stimulated scattering of intense coherent light. Discoveries and studies of various types of stimulated scattering effects have provided a much deeper and more comprehensive understanding of interactions between the intense coherent light and matter. On the other hand, devices based on stimulated Raman scattering, stimulated Brillouin scattering, and stimulated spin-flip Raman scattering can be employed as highly efficient tunable frequency shifters of coherent light. Stimulated Kerr scattering can be used to generate a super-broadband coherent light and to investigate the molecular anisotropy of liquids. In addition, the recently developed stimulated Rayleigh–Bragg scattering and stimulated Mie scattering can significantly reduce the threshold requirement, and provide a highly efficient no-frequency-shift optical phase conjugation wave.
Abstract Laser Stimulated Scattering and Multiphoton Excitation is the first book that comprehensively covers the following three major areas: (1) Quantum electrodynamic theory of stimulated scattering and multiphoton excitation processes; (2) Various stimulated scattering effects, including the early discovered stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS), the later investigated stimulated Kerr scattering (SKS), and the recently developed stimulated Rayleigh–Bragg scattering (SRBS) and stimulated Mie scattering (SMS); (3) Multiphoton excitation-based nonlinear optical effects, photoelectric effects, atomic and molecular ionization effects, and molecular dissociation effects. Each chapter covers: (i) the concept and mechanism description, (ii) the necessary theoretical formulation, (iii) the experimental research achievements, and (iv) the scientific/technological applications. Laser Stimulated Scattering and Multiphoton Excitation is useful and suitable for academics, experts, and students working or interested in the areas of nonlinear optics, nonlinear photonics, laser spectroscopy, physical optics, physical chemistry, and optoelectronic engineering.
The use of stimulated light scattering as a means for achieving optical control functions directed toward an optical computer is described. Stimulated thermal Rayleigh scattering is seen to be a preferred nonlinear optical mechanism when compared with the more familiar stimulated Raman and stimulated Brillouin scattering. It possesses the highest gain, the lowest threshold, and scattered radiation that is approximately the same frequency as the inducing radiation. Optical control functions such as optical bistable switching, optical amplification, and optical limiting or clipping are described.
The use of stimulated light scattering as a means for achieving optical control functions directed toward an optical computer is described. Stimulated thermal Rayleigh scattering is seen to be a preferred nonlinear optical mechanism when compared with the more familiar stimulated Raman and stimulated Brillouin scattering. It possesses the highest gain, the lowest threshold, and scattered radiation which is approximately the same frequency as the inducing radiation. Optical control functions such as optical bistable switching, optical amplification and optical limiting or clipping are described.
A frequency-unshifted and backward stimulated scattering can be efficiently generated in one-photon-absorption free but two-photon absorbing materials. Using a number of novel two-photon absorbing dye solutions as the scattering media and nanosecond pulsed laser as the pump beams, a highly directional backward stimulated scattering at the exact pump wavelength can be readily observed once the pump intensity is higher than a certain threshold level. The spectral and spatial structures as well as the temporal behavior and optical phase-conjugation property of this new type of backward stimulated scattering have been experimentally studied. This stimulated scattering phenomenon can be explained by using a model of two-photon-excitation enhanced standing-wave Bragg grating initially formed by the strong forward pump beam and much weaker backward Rayleigh scattering beam; the partial reflection of the pump beam from this grating provides an positive feedback to the initial backward Rayleigh scattering beam without suffering linear attenuation influence. Comparing to other known stimulated (Raman, Brillouin, Rayleigh-wing, and Kerr) scattering effects, the stimulated Rayleigh-Bragg scattering exhibits the advantages of no frequency-shift, low pump threshold, and low spectral linewidth requirement.
Acousto-optic soliton generation via stimulated Brillouin self-scattering is predicted for light propagating at the speed of sound under electromagnetically induced transparency conditions. As in stimulated Raman self-scattering, the frequency of the electromagnetic component is gradually Stokes shifted as its intensity increases; the acoustic component has no carrier frequency. This phenomenon is explained by the possibility of forward stimulated Brillouin scattering, which is forbidden in nondispersive media. In contrast to stimulated Raman self-scattering, the Stokes shift of the electromagnetic component approaches a constant limit after the pulse has propagated to a certain distance. It is shown that the predicted soliton generation does not involve any threshold condition and can occur at extremely low input pulse intensities.
We show that the backward-stimulated Rayleigh-Bragg scattering (SRBS) can be efficiently generated in a three-photon absorbing medium. Compared with all other known stimulated (such as Brillouin and Raman) scattering effects, the observed effect exhibits the following three features: (i) no frequency shift, (ii) a lower pump threshold, and (iii) no critical requirement for pump spectral linewidths within a range of Δv¯≤1cm−1. The specific nonlinear scattering medium is a three-photon absorbing chromophore solution (PRL-OT04 in chloroform), pumped by 1064nm laser pulses of nanoseconds duration but with three different spectral linewidths. The mechanism for generating backward SRBS in a three-photon active medium is the formation of a stationary Bragg grating enhanced by three-photon-absorption-associated refractive index changes. A superior optical phase-conjugation property of the backward SRBS beam has been experimentally demonstrated by employing two different optical setups. In both cases, a specially introduced aberration influence of 4-5 mrad can be basically removed by the backward SRBS beam that retains a much smaller beam divergence of ≤0.4 mrad.