Abstract
Picosecond light pulses of a passively mode-locked ruby laser (pulse duration Δt L≈35 ps) are spectrally broadened in optical fibres of core diameters from 4 μm to 600 μm. Combining the effects of self-phase modulation, stimulated Raman scattering, and parametric four-photon interaction in an 8-μm core fibre of 4 m length with the effect of selective spectral attenuation in a ruby rod resulted in rather smooth spectra extending from 685 nm to 830 nm (spectral width ≈2300 cm-1).
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Weidner, P., Penzkofer, A. Spectral broadening of picosecond laser pulses in optical fibres. Opt Quant Electron 25, 1–25 (1993). https://doi.org/10.1007/BF00431002
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DOI: https://doi.org/10.1007/BF00431002