Sub-100 fs pulses from an all-polarization maintaining Yb-fiber oscillator with an anomalous dispersion higher-order-mode fiber

A.J. Verhoef, L. Zhu, Stine Møller Israelsen, L. Gruner-Nielsen, A. Unterhuber, W. Kautek, Karsten Rottwitt, Andrius Baltuska, A. Fernandez

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Abstract

We present an Yb-fiber oscillator with an all-polarization-maintaining cavity with a higher-order-mode fiber for dispersion compensation. The polarization maintaining higher order mode fiber introduces not only negative second order dispersion but also negative third order dispersion in the cavity, in contrast to dispersion compensation schemes used in previous demonstrations of all-polarization maintaining Yb-fiber oscillators. The performance of the saturable absorber mirror modelocked oscillator, that employs a free space scheme for coupling onto the saturable absorber mirror and output coupling, was investigated for different settings of the intracavity dispersion. When the cavity is operated with close to zero net dispersion, highly stable 0.5-nJ pulses externally compressed to sub-100-fs are generated. These are to our knowledge the shortest pulses generated from an all-polarization-maintaining Yb-fiber oscillator. The spectral phase of the output pulses is well behaved and can be compensated such that wing-free Fourier transform limited pulses can be obtained. Further reduction of the net intracavity third order dispersion will allow generating broader output spectra and consequently shorter pulses, without sacrificing pulse fidelity.
Original languageEnglish
JournalOptics Express
Volume23
Issue number20
Pages (from-to)26139-26145
ISSN1094-4087
DOIs
Publication statusPublished - 2015

Keywords

  • Fiber Optics Amplifiers and Oscillators
  • Ultrafast Lasers

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