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Dispersion-free pulse duration reduction of passively Q-switched microchip lasers

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


Optics Letters 37 (2012), No.21, pp.4401-4403
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

We present a dispersion-free method for the pulse duration reduction of passively Q-switched microchip laser (MCL) seed sources. This technique comprises two stages: one that carries out the self-phase modulation induced spectral broadening in a waveguide structure and a subsequent spectral filtering stage in order to shorten the pulses in time domain. The setup of a proof-of-principle experiment consists of a fiber-amplified passively Q-switched MCL, a passive single-mode fiber used as nonlinear element in which the spectrum is broadened, and a reflective volume-Bragg-grating acting as bandpass filter. A reduction of the pulse duration from 118 to 32 ps with high temporal quality has been achieved with this setup.