Observation of self-focusing in optical fibers with picosecond pulses.
Self-focusing was observed at Raman frequencies, using picosecond pulses propagating in a large-core optical fiber of 100-microm diameter. For intense input pulses, a continuum of Stokes frequencies was generated in a small ring-waveguide structure. The ring diameter of 11 microm 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.
Baldeck
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PL
Institute for Ultrafast Spectroscopy and Lasers, Photonics Application Laboratory, The City College of The City University of New York, New York, New York 10031, USA.
Raccah
F
F
Alfano
R R
RR