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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1993),
  • paper QTuK28

Measurement of the dispersion of the second-order nonlinear susceptibilities of high-aluminium-component AlxGa1−xAs

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Abstract

Since AlxGa1−xAs is opaque at visible wavelengths, it has not been considered useful for optical frequency conversion. However, with the advent of potentially useful surface-emitting second-harmonic generation (SESHG) or surface-emitting frequency-upconversion (SEFUC) devices,1,2 knowledge of the second-harmonic coefficients and their dispersion becomes critical. Because of our interest in green and blue light emission, we chose to investigate high-aluminum-component AlxGa1−xAs because of its lower absorption, especially at blue wavelengths. The second-order nonlinear susceptibility tensor χ(2) is one of the key parameters for designing a multilayer waveguide for enhanced surface-emitting second-harmonic generation.3 For this purpose we studied χ(2) of high-aluminum AlxGa1−xAs (x ≥ 0.5) in the wavelength range 700 nm ≤ λ(w) 1000 nm, corresponding to green and blue second-harmonic (SH) signals. To the best of our knowledge, this is the first time χ(2) of AlxGa1−xAs or of any semiconductor alloy system has been reported as a function of wavelength and alloy composition.

© 1993 Optical Society of America

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