Function principle and application of laser beam expander
In complex laser optical systems, optical components play an important role, such as laser beam expanders.
The role of laser beam expander: reduce the focus spot;In laser marking or laser cutting, the smaller the spot size, the higher the energy density.Like telescopes, laser beam expanders are Afocal Optical Systems. The laser beam expander consists of two sub-elements, namely the incident element and the exit element. After assembly, the focal points of the two components coincide, that is, the focal points of F in and F out coincide.
The basic types of laser beam expanders:
There are two main types or types of laser beam expanders. Kepler form consisting of two positive lenses, Galilean form consisting of a negative lens and a positive lens.
CARMAN HAAS Laser Technology offers a wide range of laser beam expander systems. Variable Zoom Laser beam expanders supplier
The beam expander is a lens assembly that can change the laser beam diameter and divergence angle. 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 into a collimated (parallel) beam can the focusing lens be used to obtain a small high-power density spot; In laser distance measurement, it is necessary to maximize the laser collimation through the beam expander to obtain the ideal long-distance measurement effect; the beam diameter can be changed to be used for different optical instruments and equipment through the beam expander; the beam expander cooperates with the space The use of filters can change the asymmetric beam distribution to a symmetric distribution and make the light energy distribution more uniform.
The most common beam expander originated from the Galilean telescope and usually includes an input negative lens and an output positive lens. The input mirror transmits a virtual focus beam to the output mirror, and the two lenses are virtual confocal structures. Generally, beam expanders smaller than 20 times are manufactured using this principle because of their simplicity, small size, and low price. As far as possible, the beam expander is designed to have a small spherical phase difference, low wavefront deformation, and achromatic aberration. Its limitation is that it cannot accommodate spatial filtering or perform beam expansion at high magnification.
Carmanhaas could offer 3 types of beam expanders: Fixed Beam Expanders, Zoom Beam Expanders and Adjustable divergence angle beam expanders at various wavelengths of 355nm, 532nm, 1030-1090nm, 9.3um, 10.6um. Other wavelengths and custom-designed beam expanders are available upon request. For more information, please feel free to contact us.