Title :
Magnetoexciton wave packets
Author :
Koch, Martin ; Cundiff, S.T. ; Knox, Wayne H. ; Shah, J. ; Stolz, Wolfgang
Author_Institution :
AT&T Bell Labs., Holmdel, NJ, USA
Abstract :
Summary form only given. The optical response of magnetoexcitons (ME) has been a subject of considerable interest. Coherent excitation of more than one ME state requires a stable broadband coherent light source. In this paper we report on four-wave mixing (FWM) experiments on magnetoexcitons using broadband femtosecond pulses for the first time. The FWM signal reveals a complex beat structure that reflects the anharmonicity of the ME ladder. By varying the chirp of either pulse we demonstrate control of the relative phases of the individual ME polarizations. The experiments are performed on a symmetrically strained InGaAs-GaAsP sample held at 10 K.
Keywords :
III-V semiconductors; chirp modulation; excitons; gallium arsenide; gallium compounds; indium compounds; light polarisation; low-temperature techniques; magneto-optical effects; multiwave mixing; optical modulation; FWM signal; ME state; anharmonicity; broadband femtosecond pulses; coherent excitation; complex beat structure; four-wave mixing; magnetoexciton wave packets; magnetoexcitons; optical response; stable broadband coherent light source; Absorption; Chirp; Frequency; Magnetic fields; Nonlinear optics; Optical pulses; Physics; Polarization; Superconducting magnets; Ultrafast optics;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 1996. QELS '96., Summaries of Papers Presented at the
Conference_Location :
Anaheim, CA, USA
Print_ISBN :
1-55752-444-0
