Abstract
Disperse red 1 (DR1) molecules have been successfully incorporated into the one-dimensional channels of AlPO4-5 single crystals by means of vapor-phase diffusion. Polarizing microscope and SHG results indicate that the DR1 molecules are well aligned in a preferred direction along the crystal channels. The p-polarization (parallel to the c-axis of AlPO4-5 crystal) SH intensity (Ip-ex), and s-polarization (perpendicular to the c-axis of AlPO4-5 crystal) SH intensity (Is-ex) of DR1-loaded AlPO4-5 single crystals can be well fitted as a function of input polarization angle (alpha): Ip-ex = 0.69 cos4 alpha + 0.37 sin4 alpha - 0.17, Is-ex = 0.69 cos2 alpha sin2 alpha + 0.06, respectively. This polarization angle dependence can be well explained by three different SHG processes of Ip (0 degrees), Ip (90 degrees), and Is (45 degrees), originated from different combinations of two polarized photons.
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