A beam expander is a lens component that can change the diameter and divergence angle of a laser beam. The laser beam emitted from the laser has a certain divergence angle. For laser processing, only by adjusting the beam expander to make the laser beam collimated (parallel) can a small high-power density spot be obtained using a focusing mirror; In laser ranging, it is necessary to improve the collimation of the laser to the maximum extent possible through a beam expander in order to achieve ideal long-distance measurement results; By using a beam expander, the beam diameter can be changed for use in different optical instruments and equipment; The use of a beam expander in conjunction with a spatial filter can transform the asymmetric beam distribution into a symmetrical distribution and make the light energy distribution more uniform.

The most commonly used beam expander originated from the Galileo telescope, typically consisting of an input negative lens and an output positive lens. The input mirror transmits a virtual focal beam to the output mirror, and the two lenses are a virtual confocal structure. Generally, beam expanders with a magnification of less than 20 times are manufactured using this principle because they are simple, small in size, and low in price. Design the beam expander with minimal spherical aberration, low wavefront distortion, and chromatic aberration as much as possible. Its limitation is that it cannot accommodate spatial filtering or perform high magnification beam expansion.

Our company mainly produces and sells three types of beam expanders: CO2 laser beam expander (10.6mm), Nd: YAG laser beam expander (1064nm, 532, and 355nm), and HeNe laser beam expander collimator (633nm). According to customer needs, we can also supply beam expanders of other wavelengths.