ПОЛУПРОВОДНИКОВЫЙ ЛАЗЕР С АКТИВНОЙ СИНХРОНИЗАЦИЕЙ МОД ПРИ ОБРАТНОЙ СВЯЗИ НА МЕЖМОДОВОЙ ЧАСТОТЕ

We investigate the regime of active mode synchronization in a three-mirror diode laser obtained by current modulation at the intermode beat frequency of the external laser resonator. The current modulation is achieved using electrical feedback. It is shown that under certain conditions, a stable mode-locking regime is observed, and when the length of the external resonator changes, the corresponding intermode beat frequency tuning occurs. The main conditions, for which this regime is achieved, are established. The ~300 Hz width of the intermode beats spectrum at a 300 MHz intermode frequency is obtained experimentally. The broadening of the optical spectrum at the 0.5 level is ~4 nm.