Abstract

Self-focusing was observed at Raman frequencies, using picosecond pulses propagating in a large-core optical fiber of 100-μm diameter. For intense input pulses, a continuum of Stokes frequencies was generated in a small ring-waveguide structure. The ring diameter of 11 μm was about 10 times smaller than the beam diameter at low intensities. The ring structure was attributed to an induced-gradient-index profile arising from the nonlinear index of refraction.

© 1987 Optical Society of America

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