Common thin-film term. The QWOT (Quarter Wave Optical Thickness) is the wavelength (l) such that the optical thickness (index ‘n’* physical thickness ‘d’) of a coating evaporant layer is l/4: n*d = l/4. Radiant Flux. The measurement of the time rate of flow of radiant energy, expressed in watts.
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.