Measurements of intensity and frequency noise of an injection-locked 5-W Nd
:YAG laser are presented and compared with the predictions of models. We sh
ow that the output of the injection-locked laser has very low levels of noi
se, and that the measurements support the predictions of the models. Thus t
hese models can confidently be used to predict the performance of high-powe
r, injection-locked lasers being developed for gravity wave detection.