Abstract
We report measurements of the Brillouin frequencies of acoustically driven metastable states of superfluid ^{4}He at T∼1 K. This is done using a stimulated Brillouin gain spectrometer operating on a confined spatiotemporal domain (∼40 μm, 200ns). Our work questions previous experimental results regarding the metastable states of liquid ^{4}He and suggests that thermal effects or vortices can play a significant role in the cavitation process. Thanks to our time-resolved measurements, we also find that it is possible to probe metastable superfluid ^{4}He beyond the commonly defined cavitation threshold.
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