Abstract
We describe the stabilization of the beatnote of an Er,Yb:glass
dual-frequency laser at 1.5 <i>µ</i>m with and without an external microwave reference. In the first
case, a classical optical phase-locked loop (OPLL) is used, and absolute phase
noise levels as low as -117 dBrad<sup>2</sup>/Hz at 10 kHz from the carrier
are reported. In the second case one or two fiber-optic delay lines are used
to lock the frequency of the beatnote. Absolute phase noise levels as low
as -107 dBrad<sup>2</sup>/Hz at 10 kHz from the carrier
are measured, fairly independant of the beatnote frequency varying from 2
to 6 GHz. An analysis of the phase noise level limitation is presented in
the linear servo-loop theory framework. The expected phase noise level calculated
from the measurement of the different noise sources fits well with the predictions.
© 2008 IEEE
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