A device that converts an unpolarized or mixedpolarization beam of electromagnetic waves (e.g., light) into a beam with a single polarization state (usually, a single linear polarization).
SPHERICAL VS. ASPHERIC LENSES
HOW THEY’RE USED IN IMAGING APPLICATIONS
Optical Lenses are often categorized by their shape. Two common surface shapes are spherical and aspherical. Each offers unique characteristics that make it suitable for different use cases.