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Journal of the Optical Society of America B

Use of Phase Conjugation for Physical Measurement

R. W. Hellwarth

Published Jan 1, 1984• 0 citations
OpenAlex

Abstract

We review the various ways in which optical-beam phase conjugation has been found useful, sometimes uniquely, in measuring properties of traps and carriers in semiconductors, impurity ions in solids, excited dye molecules, colliding atoms, and other systems.

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In this project we have performed both experimental and theoretical studies of optical beam phase-conjugation and of electromagnetic scattering and propagation with intense optical fields. During the reporting period we have: (1) demonstrated that atomic vapors require fewer photons to perform optical wave mixing that any other medium examined to date; (2) sowed theoretically that a one-joule broadband optical pulse, whose carrier wavelength is one micron, can impart nearly one GeV energy to a charged particle; (3) established the stringent experimental upper limits on the hyperpolarizabilities of C60 and C70 molecules in solution; (4) made the first direct time-of-flight measurements of the drift velocity of photoexcited carrier in any photorefractive insulator (n- type Bi12SiO2O); (5) determined the difference between the complex polarizabilities of different trap levels in insulators; (6) made quantitative predictions and measurements of spatial harmonic content of photorefractive gratings; (7) developed and applied moving-grating diagnostic techniques to photoexcited carriers; (8) demonstrated an exception to the law of exponential attenuation of weak monochromatic optical beams in a homogeneous medium. Optical beam phase conjugation, Nonlinear effects, High power optical beam propagation, Photorefractive effect.

Final Technical Report•May 5, 1992•0 citations
In this project we have performed both experimental and theoretical studies of optical beam phase-conjugation and of electromagnetic scattering and propagation with intense optical fields. During the reporting period we have: (1) demonstrated that atomic vapors require fewer photons to perform optical wave mixing that any other medium examined to date; (2) sowed theoretically that a one-joule broadband optical pulse, whose carrier wavelength is one micron, can impart nearly one GeV energy to a charged particle; (3) established the stringent experimental upper limits on the hyperpolarizabilities of C60 and C70 molecules in solution; (4) made the first direct time-of-flight measurements of the drift velocity of photoexcited carrier in any photorefractive insulator (n- type Bi12SiO2O); (5) determined the difference between the complex polarizabilities of different trap levels in insulators; (6) made quantitative predictions and measurements of spatial harmonic content of photorefractive gratings; (7) developed and applied moving-grating diagnostic techniques to photoexcited carriers; (8) demonstrated an exception to the law of exponential attenuation of weak monochromatic optical beams in a homogeneous medium. Optical beam phase conjugation, Nonlinear effects, High power optical beam propagation, Photorefractive effect.