Non-Linear Attenuation of Excitonic Polariton Pulses in CdSe
Optical transmission and polariton time of flight measurements are done with a very thin CdSe sample (e = 0.93μ ± 0.02μ) immersed in pumped liquid helium. The source is a synchronously pumped dye laser (Rhodamine 640 or DCM). The pulse width is 6 ps; the spectral width of the pulse is 2 Å. The mean wavelength of the pulse can be easily tuned in the region of interest. The rate of repetition is 80 Mhz. The propagation time of the light through the sample is measured by the usual autocorrelation technics . Our experimental arrangment allows us to measure also the reflection and the luminescence spectra.
KeywordsLuminescence Spectrum Free Exciton Incident Intensity Intensity Laser Beam Exciton Resonance
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