polarisaatori

A polarisaatori is a device that modifies the polarization state of light. It typically achieves this by selectively absorbing or reflecting light waves based on their direction of oscillation. The most common type of polarisaatori is a linear polarisaatori, which allows only light waves oscillating in a specific plane to pass through. Unpolarized light, which has oscillations in all directions perpendicular to its direction of travel, becomes linearly polarized after passing through a linear polarisaatori.

Polarisaatori are constructed from materials that exhibit dichroism, meaning they absorb light differently depending on the polarization. A widely used dichroic material is polyvinyl alcohol (PVA) stretched to align its polymer chains. These aligned chains act like a grid, blocking light waves oscillating perpendicular to the chain direction. Another type of polarisaatori is the waveplate, which alters the polarization by introducing a phase shift between different polarization components of light.

The applications of polarisaatori are diverse. They are fundamental components in photography for reducing glare and enhancing colors, in liquid crystal displays (LCDs) to control light transmission and create images, and in scientific instruments such as microscopes and spectrophotometers for analyzing the properties of materials. They are also used in sunglasses to reduce blinding reflections and in 3D movie systems.