16 May 1994 AC Stark shift in CdSSe-doped glasses and spectral relaxation in CdTe quantum dots
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Abstract
We present femtosecond resolution measurements that demonstrate the occurrence of the ac Stark effect in glass samples doped with CdSSe nanocrystallites. The sample is excited by a 50 fs pulse 80 meV below the band edge. The absorption edge shifts tracking the profile of the pumping pulse. At intensities below 0.5 GW/cm2 the edge shift is linear in the pump intensity. Above this value the shift tends to saturate. We also studied CdTe quantum dots in a glass matrix excited resonantly with the 1S - 1S transition. In this case we observe the dynamics of hole relaxation in the valence band. The hole population equilibrates with a time constant of less than 100 fs.
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C. H. Brito Cruz, S. Tsuda, "AC Stark shift in CdSSe-doped glasses and spectral relaxation in CdTe quantum dots", Proc. SPIE 2116, Generation, Amplification, and Measurement of Ultrashort Laser Pulses, (16 May 1994); doi: 10.1117/12.175875; https://doi.org/10.1117/12.175875
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