Actively mode-locked p-Ge laser in Faraday configuration

Active mode locking of the far-infrared p-Ge laser has been achieved in the Faraday configuration of electric and magnetic fields applied to the laser crystal. The laser generates 200 ps pulses of 80-110 cm(-1) radiation with a laser-cavity roundtrip frequency of 454 MHz. The mechanism of gain modul ation by the external rf electric field is based on induced electric-field gradients inside the active crystal and requires less rf power than was fou nd previously for Voigt geometry. (C) 1999 American Institute of Physics. [ S0003-6951(99)01045-1].