Picosecond self-modulation of the fundamental absorption of a light pulse in the GaAs, that generates the stimulated emission, causing interband electron oscillations

Abstract

A brief review of experimental results is presented on discovery of a new nonlinear phenomenon - picosecond self-modulation of the fundamental absorption of a picosecond probe light pulse in a thin layer of GaAs that generates stimulated intense picosecond emission. It is explained by the synchronization of two modulations of the electron population of energy levels in the conduction band. One is created by the probing light. The other is created at the bottom of the zone by picosecond interband oscillations of electrons in the emission field and is transmitted up the zone to restore the detailed equilibrium of electron transitions with the radiation and absorption of LO phonons. Synchronization of modulations occurs in order to achieve similar detailed equilibrium.

• picosecond
• self-modulation
• fundamental light absorption
• stimulated emission
• synchronization
• interband electron oscillations
• GaAs
• пикосекундный
• автомодуляция
• фундаментальное поглощение света
• стимулированное излучение
• синхронизация
• межзонные осцилляции электронов

Аннотация (на русском)

Пикосекундная автомодуляция фундаментального поглощения импульса света в GaAs, генерирующем стимулированное излучение, вызывающее межзонные осцилляции электронов

Представлен краткий обзор экспериментальных результатов, обнаруживших новое нелинейное явление - пикосекундную автомодуляцию фундаментального поглощения пикосекундного зондирующего импульса света в тонком слое GaAs, генерирующем стимулированное интенсивное пикосекундное излучение. Она объясняется синхронизацией в зоне проводимости двух модуляций заселенности электронами энергетических уровней. Одна создается зондирующим светом. Вторая создается на дне зоны пикосекундными межзонными осцилляциями электронов в поле излучения и транслируется вверх по зоне для восстановления детального равновесия переходов электронов с излучением и поглощением LO-фононов. Синхронизация модуляций происходит для аналогичного детального равновесия.

For citation

References

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