Frequency Reference Devices and Methods of Providing Frequency References
A frequency reference device has a population of atoms or ions held in a vapour cell providing a first frequency reference signal by virtue of at least one electronic transition. A driving means provides a driving signal to the population of atoms or ions to promote the electronic transition. A detector detects a characteristic of the first frequency reference signal. The driving means includes a laser diode and a negative differential resistance oscillator. The detected characteristic of the first frequency reference signal is used to control the driving signal.
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