Hollow optical fibers and W-type fibers for high power sources and suppression of the stimulated Raman scattering

Kim, Jae-Sun (2006) Hollow optical fibers and W-type fibers for high power sources and suppression of the stimulated Raman scattering. University of Southampton, Optoelectronic Research Centre, Doctoral Thesis, 214pp.

Record type: Thesis (Doctoral)

Abstract

In this thesis, theoretical and experimental studies on hollow optical fibers (HOFs) and depressed clad hollow optical fibers (DCHOFs) for cladding-pumped high power fiber laser sources, operating at a wavelength range 900 - 1100 nm, are reported. In addition, the suppression of the stimulated Raman scattering (SRS) in a single-mode high power fiber-based master oscillator power amplifier (MOPA) source, using W-type Yb The suppression of the stimulated Raman scattering (SRS) in a small and single-mode core becomes an issue when considering the power scaling of a fiber laser. Here a W-type fiber was designed for SRS suppression with the fundamental mode cut-off set, by design, between the signal and the 1st order Raman Stokes wavelengths. SRS suppression was demonstrated in a high peak power fiber MOPA source with a single-mode output. The maximum peak power achieved was 13 kW with a small, and single-mode, core fiber without any evidence of SRS occurring.

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