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physica status solidi (b)

Coherent Signal Generation in CuCl by Light‐Induced Grating and Induced Biexciton Decay

R. Lévy, Maria J. M. Gomes, Bernard J. Kippelen, B. Hönerlage

Published Mar 1, 1990• 9 citations
Publisher

Abstract

Abstract Using a picosecond light source and a streak camera as detection system, the temporal evolution of the signal generated throughout degenerate four‐wave mixing (DFWM) experiments is analysed in CuCl at low temperature. The signal emission shows different temporal behaviour depending on whether the test pulse reaches the surface of the sample before, during, or after the pump pulse. This enables one to distinguish the light‐induced grating contribution from the induced decay of quasi‐particles. The latter process can then be used to determine their dephasing time.

DOI
10.1002/pssb.2221580139

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Abstract Using a picosecond light source and a streak camera as detection system, the temporal evolution of the signal generated throughout degenerate four‐wave mixing (DFWM) experiments is analysed in CuCl at low temperature. The signal emission shows different temporal behaviour depending on whether the test pulse reaches the surface of the sample before, during, or after the pump pulse. This enables one to distinguish the light‐induced grating contribution from the induced decay of quasi‐particles. The latter process can then be used to determine their dephasing time.
Abstract Using nanosecond laser pulses the time behaviour is investigated of degenerate four‐wave mixing close to the biexcitonic resonance in CuCl. The signal emission presents different time evolutions depending on excitation conditions. Its generation rate shows intensity changes and retardation effects. These effects are explained by an attenuation of the pump pulse through a time‐dependent nonlinear absorption and, at the resonance, by a loss of coherence related to collisions with bi‐excitons.
Abstract We present a study of optical phase conjugation through degenerate four-wave mixing in CuCl, as a function of light frequency, intensity, polarization and sample temperature. The phase-conjugate signal exhibits two maxima at the frequencies of the T5 exciton (one-photon resonance) and of the biexciton (two-photon resonance). By appropriate combinations of the input beam polarizations, it is possible to single out the various terms contributing to the signal (small-spaced, large-spaced population grating and two-photon coherent excitation). The absolute value of X(3) responsible for the two-photon resonance has been determined ( x(3) (-w,w,w, -w) = 3.10-7 e.s.u.). It leads to ‘mirror’ efficiencies of the order of 10% for input pump intensities I0 » 105 W cm -2 and sample thickness d» 10-4 cm. At higher I0, a saturation of the reflection takes place. The variation of the conjugate beam with temperature has been studied in the range 15 K < T <70 K. Finally, the phase-conjugate nature of the signal has been verified by inserting an aberrator in the path of the input probe beam, and by checking the reconstruction of the reflected beam.
We perform time-resolved degenerated four-wave mixing experiments on thin CuCl platelets (thickness of about 30 μm) and epitaxially grown layers (thickness of 5 to 10 μm) at low temperature (2K). The light source is a tunable picosecond dye-laser of 20 ps duration (FWHM) and of 0.3 meV spectral width (FWHM). It is synchronously pumped by the third harmonics of a mode-locked Nd:YAG laser. The dye-laser beam is split into two parts (pump and test) with an intensity ratio of about 8 to 1. The optical delay between both pulses is varied.
We report experiments on CuCl at 2 K with temporal, spectral and spatial resolution. The samples used are either vapor phase grown platelets or polycristalline films deposed on silicon substrates. They are excited by a nanosecond pulsed dye laser whose transmission is analysed temporally using a streak camera with picosecond resolution. The photon energy of the laser is varied around half the biexciton energy [1]. The spatial resolution is achieved using films of 2,7, 10 and 13 μm and platelets of about 30 μm thicknesses. We are thus able to study the nonlinear propagation of pulses for different wavelengths and intensities, through samples of different thicknesses.