Large nonlinear phase shifts in low-loss AlxGa1- xAs waveguides near half-gap

S. T. Ho*, C. E. Soccolich, M. N. Islam, W. S. Hobson, A. F J Levi, R. E. Slusher

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


We study the instantaneous nonlinear index change in Al 0.2Ga0.8As waveguides below the two-photon absorption edge and find π phase shifts with 80 pJ, 0.4 ps pulses at wavelengths near 1.6 μm. These large phase shifts are obtained with less than 1 dB of loss from multiphoton absorption. Our results indicate that AlGaAs waveguides, which have a mature fabrication technology, can be used as compact nonlinear elements in switching and quantum optics applications in the near-infrared. Further optimization of the waveguide geometry should result in useful nonlinear phase shifts and low losses for pulse energies approaching a picojoule.

Original languageEnglish (US)
Pages (from-to)2558-2560
Number of pages3
JournalApplied Physics Letters
Issue number20
StatePublished - 1991

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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