Despite their strong nonlinear susceptibility (d<sub>14</sub>∼120 pm/V for GaAs), III–V zinc blende semiconductors do not show any second-harmonic generation in the  direction. We demonstrate that ordered GaInP does exhibit a nonvanishing second-order coefficient in this direction. We report second-harmonic generation parallel to  in ordered Ga<sub>0.5</sub>In<sub>0.5</sub>P without domain mixture by transmission and reflection of a 1.42-μm fundamental beam in the transparency region of the material. The susceptibility tensor is fully characterized, and a value of d<sub>22</sub><sup>″</sup>≈13 pm/V is measured along  for an ordering parameter η=0.43. The susceptibility as a function of order parameter is investigated by reflected second-harmonic generation at the air/GaInP interface and interpreted in terms of bulk and surface contributions.
© 2001 Optical Society of America
(160.4330) Materials : Nonlinear optical materials
(160.6000) Materials : Semiconductor materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
Sébastien Sauvage, Yann Bernard, Isabelle Sagnes, Gilles Patriarche, Franck Glas, Guy Le Roux, Marcel Bensoussan, and Juan Ariel Levenson, "Normal-incidence (001) second-harmonic generation in ordered Ga0.5In0.5P," J. Opt. Soc. Am. B 18, 81-84 (2001)