Abstract
We investigate beam propagation in a heavy-metal-oxide glass of the group ${\text{Nb}}_{2}{\text{O}}_{5}--\text{PbO}--{\text{GeO}}_{2}$ using picosecond pulses in the near infrared. We observe a wavelength-dependent self-focusing, with beam collapse and modulation instability in the Kerr regime at $1.064\text{ }\ensuremath{\mu}\text{m}$ and stable spatial solitons at 820 nm where multiphoton absorption is present. We report near-infrared beam self-confinement and solitons, filamentation, interactions, and conical emission in the ps regime and discuss them with the aid of a numerical model.
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