Two photon absorption in semi-insulating gallium arsenide photoconductive switch irradiated by a picosecond infrared laserF. Lacassie, D. Kaplan, Th. De Saxce and P. PignoletEur. Phys. J. AP, 11 3 (2000) 189-195DOI: https://doi.org/10.1051/epjap:2000162