Cr4+: YAG chirped-pulse oscillator
Sorokin, Evgeni; Kalashnikov, Valdimir L; Mandon, Julien; Guelachvili, Guy; Picque, Nathalie; Sorokina, Irina T
Journal article, Peer reviewed
Permanent lenke
http://hdl.handle.net/11250/2356258Utgivelsesdato
2008Metadata
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Sammendrag
We demonstrate chirped-pulse operation of a Cr :YAG passively
mode-locked laser. Different operation regimes of the laser are extensively
investigated in the vicinity of zero dispersion both experimentally and
numerically. It is shown that for a given laser configuration, transition to the
positive dispersion regime allows a 5-fold increase in the output pulse energy,
which is otherwise limited by the onset of the multipulsing or ‘chaotic’ modelocking.
The output pulses have 1.4 ps duration and are compressible down to
120 fs in a 3m piece of silica fiber, enabling supercontinuum generation in a
nonlinear fiber. The spectrum shape and operation stability of the chirped-pulse
regime depend strongly on the amount and shape of the intracavity dispersion.
The numerical model predicts the existence of the minimum amount of the
positive dispersion, above which the chirped-pulse regime can be realized. Once
located, the chirped-pulse regime can be reliably reproduced and is sufficiently
stable for applications.