@article{5870,
  author = {B. E. Cole and Cjgm Langerak and B. N. Murdin and C. D. Bezant and J. M. Chamberlain and C. R. Pidgeon and M. Henini and V. Nakov},
  title = {Saturation absorption studies of intersubband relaxation rates in a p-GaAs/AlGaAs QW using a free electron laser},
  abstract = {We present saturation absorption studies of the HH1 --> LH1 intersubband transition in a 70 Angstrom p-type GaAs/AlGaAs multi-quantum well. The subband separation in this sample, with strongly non-parabolic bands, varies from 26 meV at k = 0 to 16 meV at the Fermi wave vector. The absorption behaviour of this transition is studied over a range of four orders of magnitude of intensity of incident THz radiation. The results are analysed within the contexts of a simple two-level model and an instantaneous thermalization model. The results indicate that the lifetime obtained with these models is limited by the pulsewidth, i.e. is greater than 1.7 ps. This places a lower limit on the energy relaxation lime for transitions below the LO-phonon energy. (C) 1998 Elsevier Science B.V. All rights reserved.},
  year = {1998},
  journal = {Physica E},
  volume = {2},
  number = {1-4},
  pages = {181-185},
  month = {Jul},
  isbn = {1386-9477},
  doi = {10.1016/s1386-9477(98)00039-3},
  language = {eng},
}