Abstract
This work presents, for the first time, the results of studies of stimulated Raman scattering (SRS) in 1.2-km P2O5-doped silica fiber of radiation of single- and double-scale picosecond pulses generated in a fiber master oscillator and amplified in a one-stage fiber amplifier. Shown are differences in supercontinuum spectra composed of several Stokes components when pumped with pulses of different structure. More efficient Raman transformation of double-scale pulses was identified, leading to broader supercontinuum spectra.
Highlights
Fiber lasers mode-locked due to non-linear polarisation evolution (NPE) demonstrate a unique diversity of mode-locked regimes [1,2,3,4,5,6,7,8,9,10,11,12], including both those featuring trains of pulse sets and regimes with only one pulse on the cavity round trip
This work presents, for the first time, the results of studies of stimulated Raman scattering (SRS) in 1.2-km P2O5-doped silica fiber of radiation of single- and double-scale picosecond pulses generated in a fiber master oscillator and amplified in a one-stage fiber amplifier
Shown are differences in supercontinuum spectra composed of several Stokes components when pumped with pulses of different structure
Summary
Fiber lasers mode-locked due to non-linear polarisation evolution (NPE) demonstrate a unique diversity of mode-locked regimes [1,2,3,4,5,6,7,8,9,10,11,12], including both those featuring trains of pulse sets (soliton molecules and similar) and regimes with only one pulse on the cavity round trip In the latter case, the laser can generate both fully and partially coherent pulses (the latter resembling pulse packets more than single pulses). Double-scale pulses generated in fiber master oscillators passively mode-locked due to both NPE and other mechanisms do not yet have a universally accepted appellation They are termed differently in various publications: noise-like pulses [13,14,15], double-scale lumps [16], femtosecond clusters [17], and so forth. These pulses can be readily identified in experiment by a distinct shape of auto-correlation function containing a narrow (100–300 fs) peak on a picosecond pedestal
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