We present a preliminary study of the evolution of optical properties of a hybrid organic–inorganic solid solution. The transparency range of the 2-amino-5-nitropyridinium dihydrogenphosphate–arsenate (2A5NPDP–2A5NPDAs) solid solution covers the visible and near-IR region (0.43–1.6 μm). Changes in the refractive indices that correspond to changes in the composition of the inorganic subnetwork are sufficient to fabricate waveguide devices but are too small to induce an important modification of the phase-matching directions for second-harmonic generation (SHG) at 1.064 μm. The SHG efficiency of this hybrid solid solution is roughly constant for all the compositions and is approximately six times higher than that of KDP–KDA (KH<sub>2</sub>XO<sub>4</sub> with X=P, As) salts that contain the same inorganic anions. This tends to confirm that the 2A5NP organic chromophore contributes in a large part to the SHG signals of these hybrid crystals.
© 1999 Optical Society of America
(160.1190) Materials : Anisotropic optical materials
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter
Julien Zaccaro, Alain Ibanez, and Michel Chamel, "Linear and second-order nonlinear optical characterizations of the solid solution 2-amino-5-nitropyridinium dihydrogenphosphate–arsenate 2A5NPDP(1–x)Asx (0 ≤ x ≤ 1)," J. Opt. Soc. Am. B 16, 1385-1391 (1999)