ULTRAFAST RECOVERY OF ABSORPTION SATURATION IN GaAs / AlGaAs MULTIPLE QUANTUM WELLS D. HULIN, M. JOFFRE, A. MIGUS, J. L . OUDAR, J . DUBARD et F. ALEXANDRE J. Phys. Colloques, 48 C5 (1987) C5-267-C5-270 DOI: 10.1051/jphyscol:1987557