Femtosecond hole burning measurements in semiconductors
Journal of Luminescence 53:1-6 (1992) 321-326
Abstract:
Femtosecond transient transmission spectroscopy has been used to study the generation and thermalisation of hot photoexcited electrons and holes in semiconductors. Work on bulk AlxGa1-xAs has been extended to include a detailed numerical model of carrier thermalisation and cooling, which allows for dynamic screening of carrier-phonon interactions. This model shows excellent agreement with experimentally observed effects such as hole burning, single LO-phonon emission by electrons and two-temperature behaviour of electrons and holes at early times (<10 ps). Hole burning measurements have also been made on type-I GaAs/AlAs superlattices, where the density dependence of the transient transmission spectra has been investigated. © 1992.ANISOTROPIC OPTICAL STARK-EFFECT IN GASE
20TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, VOLS 1-3 (1990) 1891-1894
The femtosecond optical Kerr effect in molten caesium chloride
Journal of Physics: Condensed Matter 1:16 (1989) 2715-2719
Abstract:
Femtosecond time-resolved measurements of the optical Kerr effect in molten caesium chloride have been made. Amplified laser pulses of 115 fs duration and 1 mu J energy were used to induce a birefringence. The transmission of a weak probe pulse of the same duration gives a value of 180 fs for the relaxation time of the induced birefringence; this value is consistent with that expected for binary ionic collisions. The magnitude of the Kerr coefficient is estimated to be approximately=3*10-22 m3 V-2 (3*10-13 esu).Femtosecond electron and hole thermalisation in AlGaAs
Solid State Electronics 32:12 (1989) 1173-1177
Abstract:
Femtosecond optical absorption spectra of AlxGa1-xAs reveal rapid thermalisation of the electron-hole plasma to a two-temperature carrier distribution after ∼ 500fs. The carriers thermalise to a single-temperature distribution at ∼ 10ps. Single phonon emission by electrons is observed at early times when the carrier density is low. Theoretical calculations which model analytically the principal carrier-carrier and carrier-phonon interactions responsible for thermalisation give good agreement with the data. © 1989.Investigation of inter-valley scattering and hot phonon dynamics in GaAs quantum wells using femtosecond luminescence intensity correlation
Superlattices and Microstructures 6:2 (1989) 199-202