Active mode locking of the far-infrared p-Ge laser is achieved via gain modulation with an rf electric field applied at one end of the crystal parallel to the Voigt- configured magnetic field. A small intrinsic voltage is observed between the rf contacts during lasing which significantly impairs the gain and also the achievable intensity and duration of mode-locked pulses. This voltage is directly compensated by applying a bias to the rf contacts. First results give mode-locked pulse durations of ~ 200 ps.

© 1998 Optical Society of America

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