Feedback-controlled mode locking (FCM) of Nd:YAG-, YAP-, and YLF-laser oscillators with superior pulse properties is demonstrated. Microsecond trains of ultrashort laser pulses are generated with durations of 11 psec (YAG), 9.8 psec (YAP), and 6.7 psec (YLF), respectively, governed by the fluorescence linewidths. Inserting an antiresonantly tuned étalon in the cavity yields stable operation with even shorter pulses of 6.4, 5.9, and 4.7 psec, respectively, and a reproducibility of ±5%.
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Heinz et al. (1990) studied this question.
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