[en] In a previously published FZKA-report the application of laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) for the analysis of trace elements in glasses resulting from the vitrification of simulated high level liquid radioactive waste (WAK-glass) was described. It was found, that the reproducibility of the analytical results obtained with a Nd:YAG laser operating at infrared wavelength (1064 nm) was relatively poor due to low ablation efficiency and fractionation effects. One reason is that during the IR ablation the plasma formed above the sample shields the laser radiation and limits the direct ablation. These effects can be reduced using shorter laser light wavelengths (UV), particularly the 266 nm wavelength. Therefore, the Nd:YAG laser was rebuilt and equipped with a harmonic generator for frequency doubling, tripling and quadrupling in order to produce wavelengths of 532, 355 and 266 nm. The first part of the paper gives a detailed description of the optimization of laser parameters for effective and reproducible evaporation of sample material. The second part presents results of laser ablation experiments using standard reference glass (NIST 610) and technical glass samples and compares the analytical results obtained for ablation with 1064 and 266 nm laser light wavelength. In the experiments the NIST 610 reference glass was used for calibration and ²⁹Si was taken as an internal standard to compensate for signal drift and differences in material transport efficiency. The better ablation characteristics of the UV laser show a clear improvement for the analysis of trace elements by ICP-MS. (orig.)