Bistability of self-modulation of the GaAs intrinsic stimulated picosecond radiation spectrum

The bistability of self-modulation of the spectrum of the stimulated picosecond radiation that appears during picosecond optical pumping of GaAs is detected. The radiation is measured before it reaches the end faces of a sample. One set of equidistant modes occurs in the radiation spectrum at the ra...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2013-08, Vol.117 (2), p.191-197
Main Authors: Ageeva, N. N., Bronevoi, I. L., Zabegaev, D. N., Krivonosov, A. N.
Format: Article
Language:English
Subjects:
Atoms
Classical and Quantum Gravitation
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Elementary Particles
Gallium arsenide
GALLIUM ARSENIDES
LAYERS
MODULATION
Molecules
Nuclear radiation
OPTICAL PUMPING
Optics
Particle and Nuclear Physics
PHOTONS
Physics
Physics and Astronomy
PULSE RISE TIME
PULSES
Quantum Field Theory
RAMAN EFFECT
Relativity Theory
Solid State Physics
SPECTRA
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Summary:The bistability of self-modulation of the spectrum of the stimulated picosecond radiation that appears during picosecond optical pumping of GaAs is detected. The radiation is measured before it reaches the end faces of a sample. One set of equidistant modes occurs in the radiation spectrum at the radiation pulse front. A set of modes located at the center between the initial modes replaces the first set in the descending radiation branch. The intermode interval inside each set coincides with the calculated interval between the eigenmodes of the GaAs layer, which is an active cavity. The radiation rise time turns out to be an oscillating function of the photon energy. The spectrum evolution is self-consistent so that the time-integrated spectrum and the spectrum-integrated radiation pulse envelope have a smooth (without local singularities) shape. The revealed bistability explains the physical nature of the two radiation-induced states of population depletion between which subterahertz self-oscillations in the radiation field were detected earlier. The radiation spectrum self-modulation is assumed to be a variant of stimulated Raman scattering.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776113080013