OPTICAL-PROPERTIES OF POTASSIUM ACID PHTHALATE

Potassium acid phthalate (KAP) crystals are promising as substrates fo r the growth of highly oriented films of conjugated polymers with exce edingly high and fast nonlinear optical response. We report the KAP op tical properties (real and imaginary parts of the refractive index (n) over tilde = n + ik) in the near infrared and visible range deduced b y ellipsometric measurements and direct inversion of transmittance and near-normal incidence absolute reflectance measurements. In the infra red region n was also deduced by the interference fringes.