  Single mode laser fields oscillate at frequencies well outside the realm of
electronics, but their phase/frequency fluctuations fall into the radio
frequency domain, where direct manipulation is possible. Electro-optic devices
have sufficient bandwidth for controlling and tailoring the dynamics of a laser
field down to sub-nanosecond time scales. Thus, a laser field can be
arbitrarily reshaped and in particular its phase/frequency fluctuations can be
in principle removed. In practice, the time evolution of a reference laser
field can be cloned to replace the fluctuations of another laser field, at a
close-by frequency. In fact, it is possible to exploit a partially stabilized
optical comb to perform the cloning across a large frequency gap. We realize
this long-haul phase transfer by using a fibered Mach-Zehnder single-sideband
modulator driven by an appropriate mix of the beat notes of the master and the
slave laser with the comb.
