  Inflation models ending in a first order phase transition produce
gravitational waves (GW) via bubble collisions of the true vacuum phase. We
demonstrate that these bubble collisions can leave an observable signature in
Advanced LIGO, an upcoming ground-based GW experiment. These GW are dependent
on two parameters of the inflationary model: $\varepsilon$ represents the
energy difference between the false vacuum and the true vacuum of the inflaton
potential, and $\chi$ measures how fast the phase transition ends ($\chi \sim$
the number of e-folds during the actual phase transition). Advanced LIGO will
be able to test the validity of single-phase transition models within the
parameter space $10^7 \rm{GeV}\lesssim \varepsilon^{1/4} \lesssim 10^{10}
\rm{GeV}$ and $0.19 \lesssim \chi \lesssim 1$. If inflation occurred through a
first order phase transition, then Advanced LIGO could be the first to discover
high frequency GW from inflation.
