I read the first sound laser (or SASER) was made in 2010 [here][1].
But **if we're talking about the state of the phonons emitted** then we could say that any sound created by a planar vibration has a unique wave vector $\vec{k}$ and its phonons are spatially coherent.  


  [1]: https://physicsworld.com/a/hail-the-first-sound-lasers/