Erbium and ytterbium codoped KLu(WO4)2 single crystals grown by top seeded solution growth. This material belongs to the monoclinic system, with the space group C2/c and unit cell parameters a=10.576 Å, b=10.214 Å, c=7.487 Å, and b=130.68°. Diode-pumped laser action at the 1550 nm eye-safe region has been achieved in this material. The data reported in this paper are the result of a collaboration between the research group FiCMA (Spain) and KTH (Sweden). For details see the paper by Bjurshagen et al., pp. 656-665.