Abstract
Recently a new mode-locking mechanism referred to as Kerr-shift mode-locking (KSM) was successfully demonstrated in a Nd:glass laser yielding a stable train of 129 fs pulses.1 A knife edge acting as an adjustable singlesided aperture was inserted into the intracavity prism section close to prism 2 (Fig. 1). The combined action of this long-pass wavelength filter and the self-phase modulation inside the laser rod produces a selffrequency shift and a saturable intracavity loss for femtosecond pulse generation. In the present talk the operation principle of this new method is investigated and a model for the description of KSM is developed.
© 1994 Optical Society of America
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