A film with polyvinyl alcohol and aqueous solution of potassium dichromate are prepared where various linear optical constants and nonlinear properties are determined via the measurements of the film optical absorbance and transmittance spectra in the wavelength range 312–900 nm and via the diffraction ring patterns by transmitting a visible, 473 nm, continuous wave with single fundamental transverse mode, low power laser beam. As high as 10¹⁰ sec⁻¹ optical conductivity and nonlinear refractive index of 10⁻¹³ cm²/W of the film are obtained due to the linear parameters and 10⁻⁷ cm²/W of the aqueous solution due to the diffraction ring patterns. Fraunhofer approximations of the Fresnel-Kirchhoff theory are used to simulate the diffraction ring patterns.

制备了具有聚乙烯醇和重铬酸钾水溶液的薄膜，其中通过测量薄膜在312-900 nm波长范围内的光吸收和透射光谱以及通过透射的衍射环图来确定各种线性光学常数和非线性性质可见的473 nm连续波，具有单个基本横模，低功率激光束。由于线性参数和10 ^-7  cm ^2，获得高达10 ¹⁰ sec ^-1的光导率和10 ^-13  cm ² / W的薄膜非线性折射率/ W的水溶液由于衍射环图案。菲涅耳-基尔霍夫（Fresnel-Kirchhoff）理论的Fraunhofer近似用于模拟衍射环图。