For the past 25 years or so, there have been many sustained research programmes devoted to the study of the techniques by which ultrashort (≤ 10-12 s) laser pulses can be generated. Whereas spectral purity can be ensured by constraining the laser to operate on a single axial or longitudinal mode of the resonator, the production of picosecond or shorter pulses demands that many longitudinal resonator modes must be precisely locked in phase by a process that is referred to as modelocking.
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Publish Date: 01 December 1991
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