Dark Oscillation of Light-induced Absorption in Heavy Reduced Co: KNSBN Crystal

M. I. Dykman, Georgiy G. Tarasov

Omar Boughdad

Yanqiu Li

This paper presents dark oscillations of light-indhced absorption in heavy reduced Co: KNSBN crystal, points out there are double carriers and multiple traps in the crystal and explains the experimental results with the newly established model of double carriers and multiple traps.

Doris E. Reiter, V. M. Axt, T. Kühn

Abstract Optically induced spin flip processes in quantum dots doped with a single Mn atom are discussed. On the femtosecond time scale the exciton can be controlled by ultra short laser pulses. Via the exchange interaction the Mn spin can flip on a picosecond time scale by transferring its angular momentum to the exciton. For a heavy hole system this flipping process can be described in terms of exchange‐induced Rabi oscillations between the bright and dark exciton state accompanied by a flip of the Mn spin. Because of the energy splitting between bright and dark excitons the Rabi oscillations are off‐resonant and a series of laser pulses is required to achieve a complete flip. When a light hole exciton is resonantly excited in addition to the heavy hole exciton we show that a flip of the Mn spin by two can be achieved by a series of light pulses while the exciton system returns to its initial state. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Elena Kuznetsova, Roman L. Kolesov, Olga A. Kocharovskaya

Xiaoguang Wu, Xierong Hu, Zhongsu Shao +2 more

Two coherent or incoherent stable self-pumped phase conjugations have been obtained simultaneously in a Ce-doped (K 0.5 Na 0.5 ) 2y (Sr 0.61 Ba 0.39 ) 1-y Nb 2 O 6 (KNSBN) crystal by using two mutually coherent input beams from a He-Ne laser, and energy translation from one beam to another induces self-pumped phase conjugative reflectivity of one beam above 100%.