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Brillouin light scattering spectroscopy is a powerful technique whichincorporates several extensions such as space-, time-, phase- and wave-vectorresolution.  Here, we report on the improvement of the wave-vector resolution by includingan electro-optical modulator. This provides a reference to calibrate theposition of the diaphragm hole which is used for wave-vector selection. Theaccuracy of this calibration is only limited by the accuracy of the wave-vectormeasurement itself. To demonstrate the validity of the approach the wavevectors of dipole-dominated spin waves excited by a microstrip antenna weremeasured.

An EOM-assisted wave-vector-resolving Brillouin light scattering setup