HIGH-FIDELITY, HIGH-ENERGY ULTRASHORT PULSES FROM A NET NORMAL-DISPERSION YB-FIBER LASER WITH AN ANOMALOUS DISPERSION HIGHER-ORDER-MODE FIBER
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United States of America Patent
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Issued Date -
Dec 25, 2014
app pub date -
Dec 6, 2012
filing date -
Dec 6, 2011
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Abstract
Embodiments of the present invention generally relate to high energy, ultrashort pulses from a net normal dispersion ytterbium fiber laser with an anomalous dispersion higher-order mode fiber. More specifically, embodiments of the present invention relate to a fiber oscillator with all-fiber dispersion compensation delivering pulse parameters comparable to solid-state oscillators having good compensation of higher order dispersion and intracavity nonlinearities. In one embodiment of the present invention, an oscillator comprises a length of single mode fiber and a length of higher-order mode fiber, where the group delay dispersion (GDD) of the higher-order mode fiber is chosen to match 50% or more of the GDD of the single mode fiber; wherein a third-order dispersion of the oscillator matches a nonlinear phase buildup in a cavity of the oscillator, and the nonlinear phase buildup is dependent upon the pulse energy of the oscillator.
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