I’m excited to announce that our paper Digital holographic imaging of superfluid helium free surfaces is now live on arXiv. This was an incredibly enjoyable collaboration, especially with Vitor Barroso. Together with my co-authors, we show how off-axis digital holography (lasers!) can capture nanometre- to micrometre-scale fluctuations on the surface of superfluid helium, allowing us to reconstruct the dispersion relation of gravity-capillary superfluid waves.