  Quantum nondemolition theory has been well understood for a number of
decades, however, applications of such techniques remain limited owing to the
increased complexity that these techniques require. In this paper, quantum
nondemolition theory is used to investigate the performance of a real world
device, an electro-optic feed-forward intensity noise eater. It is shown that
by replacing the typical beamsplitter in such a device with a single pass
second harmonic generation followed by a dichroic mirror the performance of the
noise eater can be significantly improved, even with low conversion
efficiencies.
