A MONTE-CARLO SIMULATION OF MODE-LOCKED HOT-HOLE LASER OPERATION

We propose a method to achieve mode-locking in a p-germanium intervale nceband laser by modulating its gain. This is done by applying an addi tional radiofrequency (RF) electric field parallel to the applied magn etic field. Due to the acceleration by this RF field, the light holes are no longer accumulated in the so-called passive region below the op tical photon energy and the population inversion between the light and heavy hole band decreases strongly. A single-particle Monte Carlo sim ulation is used to study this effect more quantitatively. It is shown that an RF field of only a few per cent of the applied DC electric fie ld already yields a peak-to-peak gain modulation of 30-50%. It is esti mated that by using this method for actively mode-locking a p-Ge inter valenceband laser, picosecond FIR pulses of considerable power can be obtained.