  Brillouin spectroscopy is a powerful optical technique for viscoelastic
characterization of samples without contact. However, like all optical systems,
Brillouin spectroscopy performances are degraded by optical aberrations, and
have therefore been limited to homogenous transparent samples. To correct for
aberrations, adaptive optics (AO) methods have been previously integrated into
a variety of optical modalities ranging from ground-based telescopes to
super-resolution microscopes. In this work, we developed an adaptive optics
configuration designed for Brillouin scattering spectral analysis. Our
configuration doesn't require direct wave-front sensing and the injection of a
'guide-star'; hence, it can be implemented without the need for sample
pre-treatment. We used our AO-Brillouin spectrometer in aberrated phantoms and
biological samples; consistent with previous AO systems, we demonstrate
effective correction of optical aberrations yielding 2.5-fold enhancement in
Brillouin signal strength and 1.4-fold improvement in axial resolution.
