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Conferences > CLEO > 2001 > CTuP > CTuP4
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 2001),
  • paper CTuP4

Nanoscale light-induced phase transformation in alpha-gallium as the source of a broadband optical nonlinearity

K.F. MacDonald, V.A. Fedotov, N.I. Zheludev, B.V. Zhdanov, and R.J. Knize

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Abstract

Using a tuneable optical parametric oscillator we discovered that the interface between gallium and silica displays an exceptionally broadband nonlinearity. At temperatures several degrees below gallium’s melting point (~30°C) the reflectivity increases by up to 40% in response to 3 ns excitation pulses at wavelengths from 440 to 700 nm (Fig. 1). Fig. 2 shows how the reflectivity change depends on the excitation fluence, and that it saturates at about 6 mJ/cm2.

© 2001 Optical Society of America

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