Crystalline Nd:KLU(WO4)(2) has been grown by the top-seeded-solution growth (TSSG) method. The polarized Raman spectrum, infrared spectrum, polarized absorption spectrum and fluorescence spectrum have been recorded at room temperature. The lattice vibration modes were calculated using space group theory and the infrared transmission spectrum was used as a supplement to the Raman spectrum to assign the modes more accurately. The Judd-Ofelt theory was used to study some important spectroscopic parameters, which were also compared with some other Nd3+ doped double tungstates. (C) 2007 Elsevier B.V. All rights reserved.