The laser beam expanding and focusing lens is a key optical element in the optical industry. The function of this optical element is to change the state of light through focusing, filtering, reflection or polarization of light and other different methods. Therefore, the optical element can be integrated with countless applications. Moreover, the optical element is made of a specific substrate or Anti-reflective coating. Its function is mainly to optimize the specified ultraviolet ray, Performance within visible or infrared wavelengths and wavelength ranges. These optical components are mainly used in industries such as microscopes, interferometry, imaging, and lasers. Below, we will take a specific overview of laser beam expanding lenses.
Usually, a beam expanding lens is a lens component that can change the diameter and divergence angle of a laser beam. Generally, the laser beam emitted from the laser has a certain divergence angle. For the laser industry, only by adjusting the beam expanding mirror to make the laser beam collimated and parallel can small high-power density light spots be obtained using a focusing mirror. In the laser ranging industry, the ideal long-distance ranging effect can only be achieved by maximizing the laser collimation through the beam expander. The beam expander can change the beam diameter so that it can be used for different Optical instrument. The use of the beam expander with the space filter can change the asymmetric beam distribution to the symmetric distribution and make the optical energy distribution more uniform.
The earliest beam expanding focusing mirror was composed of an input negative lens and an output positive lens. The input mirror transmitted a virtual focal beam to the output mirror, and the two lenses were of a virtual confocal structure. When designing a beam expander, try to design it with a small spherical phase difference, low wavefront deformation, and achromatic aberration as much as possible. The function of the beam expander is to reduce the divergence angle of the laser beam, thereby making the laser focus spot smaller.