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Physical review. B, Condensed matter

Degenerate-signal generation in CuCl under nanosecond-excitation conditions

Samy S. Montasser, Hisham A. El-Kolaly, B. Hönerlage

Published Nov 15, 1991• 0 citations
Publisher

Abstract

The theory that was developed for wave-mixing processes with Gaussian pulses is used here for a real nanosecond pulse for comparison with experiment. Good agreement between the theory and the experimental results for CuCl was obtained for the intensity dependence and excitation spectrum of the signal beam. We found the coherence times for the exciton and biexciton states to be 11 and 0.7 ps, respectively.

DOI
10.1103/physrevb.44.11490

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We present a thorough investigation of the different relaxation channels opened in a strongly interacting system of excitonic quasiparticles in CuCl for density regimes ranging up to 50 MW/cm2{\mathrm{cm}}^{2}cm2. A spectrally narrow pump beam consisting of 30-ps pulses is tuned around one-half the biexciton energy. It creates an initial distribution of biexcitons through resonant two-photon absorption. A spectrally broad probe beam made of pulses that also have 30-ps duration monitors the excitation-induced variation of the transmission spectrum of CuCl samples near the Z3{\mathit{Z}}_{3}Z3​ exciton resonance. Coherent processes corresponding to parametric emissions of various orders are observed. Absorption and gain bands that reflect the evolution of biexciton and exciton populations on their respective dispersion curves are followed as functions of the time delay between pump and probe pulses.
We study the temporal and spatial evolution of a pump, test, and signal field generated in a four-wave-mixing process for resonant excitation of a nonlinear medium by nanosecond pulses. The propagation effects for the pulses are taken into account beyond the usual mean-field approximation. The model is then applied to a three-level system, describing CuCl at low temperatures. A great deal of new information concerning the temporal and spatial structures of the different fields propagating through the sample is obtained. We show, for instance, that the temporal shapes of the interacting fields are well established after propagation through the first few micrometers of the sample. Beyond this, they propagate with a diminishing amplitude. We also show that these structures are due to the dephasing of the fields throughout their propagation as well as to the temporal evolution of the absorption and generation function of the sample.