Beam expanders

A beam expander is an optical system that consists of two or more elements. The beam expander changes the size and divergence of the beam. They are commonly used:

1. in laser processing applications. The beam expander can transform the laser beam with a certain divergence angle into a collimated (parallel) beam, thus using the focusing lens to obtain a small spot with high power density.
2. in laser measurement systems. The beam expander can be used to maximize the collimation of the laser and obtain the ideal long-distance measurement effect.
3. to change the beam diameter for different optical instruments and equipment.
4. in combination with a spatial filter and a beam expander to make the energy distribution of an asymmetric spot symmetrical and more uniform.