Nonlinear Optical Characterization of GaN Layers Grown by MOCVD on Sapphire


Optical second and third harmonic generation measurements were carried out on GaN layers grown by metalorganic chemical vapor deposition (MOCVD) on sapphire substrates. The measured d33 is 33 times the d11 of quartz. The angular dependence of second-harmonic intensity as well as the measured ratios d33/d15= -2.02 and d33/d31 = -2.03 confirm the wurzite structure of the studied GaN layers with the optical c-axis oriented perpendicular to the sample surface. Fine oscillations were observed in the measured second and third harmonic angular dependencies. A simple model based on the interference of the fundamental beam in the sample was used to explain these oscillations.

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Correspondence to Ivan M. Tiginyanu.

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Tiginyanu, I.M., Kravetsky, I.V., Pavlidis, D. et al. Nonlinear Optical Characterization of GaN Layers Grown by MOCVD on Sapphire. MRS Online Proceedings Library 595, 1152 (1999).

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