What Is a Beam Expander?
A beam expander is an optical device designed to increase the diameter of laser beams, allowing for precise control over their characteristics.
This device is crucial in various applications, such as laser processing systems and optical interferometers, playing an indispensable role in the advancement of modern science.
Beam expanders are categorized into two types: the Galilean, which utilizes a concave and a convex lens, and the Keplerian, which employs only convex lenses. Each type offers distinct characteristics, making the selection of the appropriate expander critical based on the intended application.
The primary function of a beam expander is to reduce the spot size when focusing, which in turn increases the energy density. This enhancement facilitates more efficient processing and accurate measurements.