Characterizing the nonlinear optical properties of various materials plays a prerequisite role in optics. Among different measurement methods, well-known Z-scan technique and modified versions have been recognized as simple accurate methods for measuring both real imaginary parts refractive index. However, based on detecting small beam variations impose severe restriction roughness materials. T...

We report a single-beam, differential z-scan technique with improved sensitivity for the determination of nonlinear absorption and refraction of materials. A sample is scanned in the direction of beam propagation as usual, but, in addition, its longitudinal position is dithered, producing a detector signal proportional to the spatial derivative of only the nonlinear transmission and therefore g...

Background and Aims: Biomolecules' optical and nonlinear optical properties are widely used for different medical diagnoses and applications in biophotonic devices. These properties are essential in studying biological processes in living tissues. Aside from biomolecules' linear optical characteristics, their nonlinear optical characteristics have lately been considered. Materials and Methods:...

We did this work to help professors and students of physics engineering in Optics Lasers courses who require a theoretical-experimental introductory framework nonlinear optics. showed article the basic principles theory, focusing on third-order optical phenomena, using well-known Z-scan technique for its demonstration. For this, we propose design simple experiment that interested party can do a...

In this seminar the third-order nonlinear optical phenomena are described. The emphasis is on the nonlinear refractive index n2. We describe the Z-scan technique, which is a simple method to determine n2. At the end we show how Z-scan method can be used to examine protein concentration in human blood.