Abstract
In view of increasing use of large-core fiber-optic laser beam delivery systems, especially in high-resolution spectroscopic applications, we report experimental studies on unwanted spectral distortions arising from non-linear optical processes during the propagation of a narrow-band (<0.9 GHz, fwhm) pulsed (9.3 ns) dye laser beam through a large diameter (600 μm), step-index, pure silica core fiber. Large spectral broadening (100 GHz, fwhm) and cascaded stimulated Raman scattering (tilde; 11–13 orders), at low input powers were observed. Enhancement of the spectral distortions due to self-focusing of the input wave is qualitatively discussed. The spectral distortions could be suppressed considerably by disrupting self-focusing by external perturbations at various locations along the length of the fiber.
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