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Smoothed spectra for enhanced dispersion-free pulse duration reduction of passively Q-switched microchip lasers

: Lehneis, Reinhold; Jauregui, Cesar; Steinmetz, Alexander; Limpert, Jens; Tünnermann, Andreas


Optics Letters 39 (2014), No.3, pp.505-508
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

We present an enhanced technique for dispersion-free pulse shortening, which exploits the interplay of different third-order nonlinear effects in a waveguide structure. When exceeding a certain value of the pulse energy coupled into the waveguide, the typical oscillations of self-phase modulation (SPM)-broadened spectra vanish during pulse propagation. Such smoothed spectra ensure a high pulse quality of the spectrally filtered and, therefore, temporally shortened pulses independently of the filtering position. A reduction of the pulse duration from 138 to 24 ps has been achieved while preserving a high temporal quality. To the best of our knowledge, the nonlinear smoothing of SPM-broadened spectra is used in the context of dispersion-free pulse duration reduction for the first time.