  We present a detailed theoretical discussion of the effects of ubiquitous
laser noise on cooling and the coherent dynamics in opto-mechanical systems.
Phase fluctuations of the driving laser induce modulations of the linearized
opto-mechanical coupling as well as a fluctuating force on the mirror due to
variations of the mean cavity intensity. We first evaluate the influence of
both effects on cavity cooling and find that for a small laser linewidth the
dominant heating mechanism arises from intensity fluctuations. The resulting
limit on the final occupation number scales linearly with the cavity intensity
both under weak and strong coupling conditions. For the strong coupling regime,
we also determine the effect of phase noise on the coherent transfer of single
excitations between the cavity and the mechanical resonator and obtain a
similar conclusion. Our results show that conditions for optical ground state
cooling and coherent operations are experimentally feasible and thus laser
phase noise does pose a challenge but not a stringent limitation for
opto-mechanical systems.
