Impact of Mode Filtering on the Performance of Femtosecond Pulse Amplification in a Large Mode Area Fiber

Impact of Mode Filtering on the Performance of Femtosecond Pulse Amplification in a Large Mode Area Fiber

Citation

J. Hamazaki, H. Mogi, N. Sekine, S. Ashihara, A. Kasamatsu, and I. Hosako, "Impact of Mode Filtering on the Performance of Femtosecond Pulse Amplification in a Large Mode Area Fiber," IEICE Trans. Electron., vol.E98–C, no.9, pp.928–933, September 2015

Keywords

  • Mode filtering
  • Femtosecond pulse amplification
  • Large mode area fiber (LMA fiber)
  • Yb-doped fiber (YDF)
  • Double-clad fiber (DCF)
  • Lowest transverse mode (LP01 mode)
  • Higher-order modes (HOMs)
  • Spatial profile
  • Temporal profile
  • Pulse duration
  • Pulse energy
  • Average power
  • Single-mode fiber (SMF)
  • Spectral broadening
  • Self-phase modulation
  • Autocorrelation trace
  • Group velocity mismatch

Brief

The article demonstrates that using a mode filtering technique with a single-mode fiber in a large mode area Yb-doped fiber femtosecond pulse amplifier results in high-power, short pulses with improved spatial and temporal quality by selectively amplifying the fundamental mode.

Summary

Using a single-mode fiber as a filter in a high-power laser system with a large core fiber improves the quality (spatial and temporal profiles) of the output pulses by ensuring only the fundamental mode is amplified, resulting in high-power ( > 3 W), short (110 fs) pulses without the distortions caused by other modes.

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