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Journal of Russian Laser Research 34, (2013)

SCIE

COHERENT PUMP-PROBE RESPONSE OF QUANTUM WELLS: POLARIZATION DEPENDENCE

Hoang Ngoc Cam

We consider a coherent pump{probe response from quantum wells using the exciton{boson formalism approach. We obtain the mean- eld contribution and that of the biexciton as well as of a molecular scattering state in analytic form and show that each of these contributions may completely disap- pear in one or another polarization con guration of the pump and probe pulses, which makes the response strongly dependent on polarization. We apply general formulas for calculating the di er- ential absorption spectrum of quantum-well samples under excitation conditions supporting the slow exciton{exciton scattering. The obtained results are in good qualitative agreement with available experimental observations.