  The frequency of a 700mW monolithic non-planar Nd:YAG ring laser (NPRO)
depends with a large coupling coefficient (some MHz/mW) on the power of its
laser-diode pump source. Using this effect we demonstrate the frequency
stabilization of an NPRO to a frequency reference by feeding back to the
current of its pump diodes. We achieved an error point frequency noise smaller
than 1mHz/sqrt(Hz), and simultaneously a reduction of the power noise of the
NPRO by 10dB without an additional power stabilization feed-back system.
