Laski's main research focus later on was infrared research. This included the examination of selected chemical substances by means of infrared radiation—a field of application. Beginning in 1924, Laski was the director of the Infrared Department at the Institute for Fibre Chemistry of the Kaiser Wilhelm Society, a department which was closed due to lack of financing. She then became a voluntary assistant at the Physikalisch-Technische Bundesanstalt (Imperial Physical-Technical Institute) in 1927, in order to establish an infrared laboratory.