22 Dec 2015 ULO Optics have expanded their comprehensive catalogue of laser optics to include a range of beam expanders specifically designed for low power lasers such as Nd:YAG and Yb doped fibre lasers operating near the 1μm wavelength.
The beamexpanders are of Galilean design and use Multi-spectral Zinc Sulphide for the optics which has an absorption at 1μm of 0.0005cm−1 (similar to ZnSe at 10.6μm).
ZnS also has 20 times the thermal conductivity of Fused Silica and a higher refractive index. The refractive index allows a two element design to be used rather than three elements. | 
