First demonstration of two photon absorption in a semiconductor waveguide pumped by a diode laser

H. K. Tsang, P. P. Vasil'ev, I. H. White, R. V. Penty, J. S. Aitchison

Research output: Contribution to journalArticle


For the first time, lasers have been used to induce a fast all-optical nonresonant nonlinearity at wavelengths well beyond the band edge in a GaAs/GaAlAs multiquantum well waveguide. Using a Q-switched diode laser, which gave optical pulses of 3.5 ps duration and 7W peak power, an intensity-dependent transmission was recorded that was consistent with the presence of two photon absorption in the waveguide. The measured two photon absorption coefficient was 11°2cm/GW.

Original languageEnglish
Pages (from-to)1660-1661
Number of pages2
JournalElectronics Letters
Issue number18
Publication statusPublished - 1 Jan 1993


  • Nonlinear optics
  • Optical waveguides

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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