Two-photon absorption controlled by the resonance optical stark effect in crystals and quantum nanostructures
- Vavilov State Optical Inst., St. Petersburg (Russian Federation)
The influence of the resonance optical Stark effect on two-photon generation of electron-hole pairs is studied in bulk crystals and in materials with quantum wells or wires. The case is considered when the light frequency is in the resonance with the frequency of transition between two conduction bands c and c{sub 1}, which is adjacent to the transition between the valence and v and the band c involved in the two-photon absorption. Calculations were performed for materials whose band structure near the critical points is characterized by one or two different principal values of the reciprocal effective mass tensor. Two-photon absorption spectra are described for different types (maximum, minimum, and saddle) of critical points corresponding to the v {r_arrow} c and v {r_arrow} c{sub 1} transitions. Features on the dispersion curves of the two-photon absorption in the form of breaks and peaks are assigned to the critical points in the band spectrum renormalized in the field of a strong light wave. Methods for determining the form of the upper conduction band c{sub 1} by the spectral position of features of the two-photon absorption band are considered. The dependences of the coefficient K of the two-photon absorption controlled by the resonance optical Stark effect on the light intensity J are obtained. It is shown that the K(J) dependence includes singularities close to which the K values can change by an order of magnitude upon a slight variation in J. The possibilities of using the dependences obtained to control light with light are discussed. 29 refs., 6 figs., 1 tab.
- OSTI ID:
- 457042
- Journal Information:
- Optics and Spectroscopy, Vol. 78, Issue 3; Other Information: PBD: Mar 1995; TN: Translated from Optika i Spektroskopiya; 78: No. 3, 445-456(1995)
- Country of Publication:
- United States
- Language:
- English
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