Subterahertz self-oscillations in ultrafast self-modulation of optical absorption in GaAs
- Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation)
Ultrafast self-modulation of the optical absorption spectrum occurs during intense picosecond optical pumping of GaAs. It is found that the ultrafast self-modulation of the absorption of light with a fixed photon energy {Dirac_h}{omega} manifests itself as self-oscillations consisting of two subterahertz harmonics (of which the second one is at the doubled frequency) or a single subterahertz harmonic. The dependences of the parameters of selfoscillations on {Dirac_h}{omega} at different energies of the pumping pulse are determined. An explanation is given for the previously observed cyclic replication of the shape of ultrafast self-modulation of the absorption spectra. It is suggested that, first, self-modulation of optical absorption is due to changes in the populations of energy levels with charge carriers and, second, the self-modulation is associated with the self-modulation of the intrinsic stimulated picosecond emission from GaAs. On these assumptions, the above-mentioned dependences can serve to gain an insight into the nature of subterahertz self-oscillations for the population depletion and the emission.
- OSTI ID:
- 21255589
- Journal Information:
- Semiconductors, Vol. 42, Issue 12; Other Information: DOI: 10.1134/S106378260812004X; Copyright (c) 2008 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
- Country of Publication:
- United States
- Language:
- English
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