An optical plane wave with 20 = 532 nm propagates through an isotropic material with unknown optical properties. The total optical phase accumulated per unit length in the material is 1.8 x 10ª radians/mm and the optical power decreases by 90% when propagating over 2 mm. Calculate the complex index of refraction for this material, n = n'-j.n".

An optical plane wave with 20 = 532 nm propagates through an isotropic material with unknown optical properties. The total optical phase accumulated per unit length in the material is 1.8 x 10ª radians/mm and the optical power decreases by 90% when propagating over 2 mm. Calculate the complex index of refraction for this material, n = n'-j.n".