The product of beam diameter and divergence of the laser beam is a constant and therefore remains unchanged, i.e. increasing the beam diameter means reducing the divergence of the beam to the same degree. This is true for the expanders with fixed expansion factor as well as for the zoom expanders, where the magnification is variable. Each type of our beam expanders offers a manual or motorized divergence adjustability.
All optical elements of beam expanders consist of fused silica and provide stable and reliable performance even with high average power or laser with high peak power. Because of the high power density (especially at the entrance lens element) we advise our low absorption coating always be used.
Further information can be found in our laser product catalog.