Practical ultra-low frequency noise laser system for quantum sensors
arxiv(2024)
Abstract
The laser's frequency noise is crucial to the sensitivity of quantum sensors.
Two commonly used methods to suppress the laser's frequency noise are locking
the laser to an atomic transition by the lock-in technique or to an ultra-low
thermal expansion (ULE) glass cavity by the PDH technique. The former cannot
suppress rapidly changing frequency noise and hardly meets the needs; the
latter has powerful performance but a heightened cost. The lack of
high-performance and low-cost laser noise suppression methods dramatically
limits the practical application of quantum sensors. This work demonstrates
that, in many quantum sensing applications such as the Rydberg atomic
superheterodyne receiver, by cascade locking the laser to both the atomic
transition and a low-cost (LC) cavity, the same performance as locking to the
ULE cavity can be achieved. This work is significant in promoting the practical
application of quantum sensors.
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