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Soviet Journal of Quantum Electronics

Influence of fluctuations of laser radiation on the formation of ultrashort-period gratings in inhomogeneously broadened media

Sergey A. Moiseev, E. I. Shtyrkov

Published Jun 30, 1991• 1 citation
Publisher

Abstract

A theoretical investigation is reported of the influence of laser fluctuations on the formation of ultrashort-period population-inversion gratings in the case of an inhomogeneously broadened resonant transition. It is shown that such gratings may be formed in a narrow spectral interval and that their amplitude always obeys the normal distribution for different spectral isochromats.

DOI
10.1070/qe1991v021n06abeh003916

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A theoretical investigation is reported of the influence of laser fluctuations on the formation of ultrashort-period population-inversion gratings in the case of an inhomogeneously broadened resonant transition. It is shown that such gratings may be formed in a narrow spectral interval and that their amplitude always obeys the normal distribution for different spectral isochromats.
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It is shown that the lineshapes of inhomogeneously broadened spectra, due to the statistical nature of their formation, exhibit spectral fluctuations. Formulas are obtained that allow one, based on correlation analysis of different realizations of the inhomogeneously broadened line, to reconstruct its homogeneous lineshape and to evaluate the number of centers involved in its formation. The magnitude of these spectral fluctuations is estimated and it is shown that the proposed method can be efficiently used in practice.
We consider the conversion of monochromatic radiation in the case of resonant interaction with a quantum system under the condition of harmonic modulation of the quantum transition frequency by the action of additional nonresonant radiation due to the Stark or Zeeman effect, taking into account the inhomogeneous broadening of the quantum transition line. It is shown analytically and numerically that resonant radiation can be converted in a train of ultrashort pulses with a peak intensity exceeding manifold the incident wave intensity. The possibility of the additional compression of the produced pulses is studied by compensating the inherent frequency modulation in a medium with a quadratic or programmable dispersion. The optimal values of the radiation — matter interaction parameters are found numerically. It is shown that generation of femtosecond optical pulses of radiation quasi-resonant to the δ transition of the atomic hydrogen Balmer series is possible.
A theoretical and experimental investigation is reported of the formation of the spatial coherence of superluminescence in dispersive media. The theory is developed in the axial approximation for a given amplitude of a traveling population-inversion pulse. Asymptotic coherence characteristics are obtained for certain important limiting cases. The results are given of an experimental investigation of the spatial coherence of a superluminescent dye laser excited by single picosecond pulses. An analysis is made of the possibility of obtaining short-wavelength superluminescence radiation with a high degree of spatial coherence.