The linear and nonlinear optical properties of well-ordered Y-type Langmuir–Blodgett (LB) multilayers of 2-docosylamino-5-nitropyridine (DCANP) have been investigated. The nonlinear optical susceptibilities have been determined for the wavelengths λ=1064 nm [d33=(7.8±1) pm/V, d31=(2.0±0.5) pm/V] and λ=1318 nm [d33=(5.6±1) pm/V]. In first waveguiding experiments carried out TE0 and TM0 modes propagating over more than 20 mm could be excited. Coupling experiments allowed the determination of the dispersion of the refractive index n3 (n632.8 nm3 =1.598). Guided wave attenuation coefficients as low as 12 dB/cm (at the wavelength λ=632.8 nm) are reported.
In LEC-grown GaP, two vibrational lines at 3250.9 cm ± ±1 and 3106.0 cm ± ±1 are measured and assigned to the stretching modes of two different O±H centres. In GaP containing both hydrogen and deuterium, two additional lines appear, both shifted to lower energies by the same factor r 1X346. This result shows that both O±H centres contain only one hydrogen atom. The O±D line at 2415 cm ± ±1 is split into two lines. This splitting possibly indicates a further example for resonant interaction of local modes with extended ones. The comparison with GaAs suggests the assignment of two lines to the analogous O±H centres in GaAs.
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