YAG Beam Expander is a common accessory of laser equipment, and laser beam expander is a lens component that can change the diameter and divergence angle of the 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 larger the magnification of the beam expander, the larger the emitted light spot, resulting in the smallest divergence angle of the light (because a beam expander with a magnification of X can compress the divergence angle of the incident light to one tenth of its original X) - closer to parallel light. This way, the light spot focused by the field lens will be finer, the energy will be more concentrated, and the deformation of the printed characters will be smaller. But it's not necessarily better to have a higher magnification of the beam expander, as we also need to consider other factors.
The function of laser beam expander
The function of a laser beam expander is to reduce the focused spot. In laser marking or laser cutting, the smaller the spot, the higher the energy density can be obtained. The larger the diameter of the beam, the smaller the size of the spot. The laser beam expander is designed to increase the diameter of the beam.
Like a telescope, a laser beam expander is an Afocal Optical System without a focal point. The laser beam expander consists of two sub components, 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 magnification of a laser beam expander is the ratio of two focal lengths.
Basic types of laser beam expander:

There are two main forms or types of laser beam expanding mirrors. The Kepler form consists of two positive lenses and the Galilean form consists of one negative lens and one positive lens.

Specification

Product Name	Specification and model
YAG Beam Expander	M22-2X
YAG Beam Expander	M22-3X
YAG Beam Expander	M22-4X
YAG Beam Expander	M22-5X
YAG Beam Expander	M22-6X
YAG Beam Expander	M22-8X
YAG Beam Expander	M22-10X
YAG Beam Expander（straight tube type）	M22*075-1.5x(Ф27-L40)
YAG Beam Expander（straight tube type）	M22*0.75-2X(Ф27-L48)
YAG Beam Expander（straight tube type）	M22*0.75-3X(Ф27-L68)
YAG Beam Expander（straight tube type）	M22*0.75-4X(Ф27-L76)
YAG Beam Expander（straight tube type）	M22*0.75-5X(Ф27-L72)
YAG Beam Expander（straight tube type）	M22*0.75-6X(Ф27-L74)
YAG Beam Expander（straight tube type）	M22*0.75-8X(Ф27-L70)
YAG Beam Expander（straight tube type）	M22*0.75-10X(Ф27-L70)
YAG Beam Expander（straight tube type）	M22*0.75-12X(Ф27-L77.7)
YAG Beam Expander（straight tube type）	M22*0.75-15X(Ф27-L74)
YAG Beam Expander（straight tube type）	M22*0.75-20X(Ф27-L83)

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