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We report on the characteristics of active-passive mode-locked phosphate-glass oscillators. These highly reliable oscillators operate at 1.054 μm and are characterized by the absence of satellite pulses for pulse durations tp≳80 psec. They have very high peak-to-background contrast of 107 to 108. Transform-limited pulse widths between 80 and 600 psec are reliably generated using a pair of intracavity etalons. The reproducibility of the pulse durations is better than ±10%, that of the pulse-train maximum about ±10 to 20%. Single-pulse selection with ±5% amplitude fluctuation has been achieved with threshold-pulse selectors. For pulses shorter than 50 psec, satellite pulses are occasionally observed. A theoretical explanation for this observation is given.
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Seka et al. (1978) studied this question.
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