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Zinth, Wolfgang and Laubereau, Alfred and Kaiser, Wolfgang (1977): Generation of chirp-free picosecond pulses. In: optics communications, No. 22: pp. 161-164
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Abstract

The frequency spectrum of moderately chirped laser pulses depends upon the portion of the beam which is accepted by the spectrometer. Observation of the development of the chirp in a mode-locked pulse train allows to determine the small incipient chirp of early pulses. A product, bandwidth times pulse duration, of 0.47 ± 0.03 is consistently observed for single pulses switched from a passively mode-locked Nd-glass system.