Experimental data for the paper "Observation of angular momentum transfer among crystal lattice modes", published with open-access in Nature Physics under https://doi.org/10.1038/s41567-026-03274-8 The data was measured at the Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society in Berlin. Contents: Data from Fig. 1 c-f Data from Fig. 2 a-d Data from Fig. 3 b, c Data from Fig. 4 a-c Data from Extended Data Fig. 1 b-f Data from Extended Data Fig. 2 b-e Data from Extended Data Fig. 3 a-d Data from Extended Data Fig. 4 a-m Data from Extended Data Fig. 5 a-m Data from Extended Data Fig. 6 a-j Data of the Supplementary Materials will be provided upon request. Please contact Olga Minakova (minakova[at]fhi-berlin.mpg.de) or Sebastian F. Maehrlein (s.maehrlein[at]hzdr.de) for such a request or for general questions.