Abstract
Using a stimulated Brillouin gain spectroscopy technique, we have measured the equation of state of bulk liquid helium-4 at $\ensuremath{\sim}1$ K between 0 and 10 bars. Our results are in very good agreement with previous measurements and with theoretical equations of state. However, our specific method allows one to determine it on space/timescales as narrow as 35 $\ensuremath{\mu}\mathrm{m}$/190 ns. This technique is of particular interest for solving a remaining debate about the value of the homogeneous cavitation pressure of liquid $^{4}\mathrm{He}$ at $T\ensuremath{\sim}1$ K.
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