Dr. Yuan-Yu Jau Profile

Dr. Yuan-Yu Jau

at Princeton Univ

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Proceedings Article | 31 January 2008 Paper

End-resonance clock and all-photonic clock

Yuan-Yu Jau, William Happer, Fei Gong, Alan Braun, Martin Kwakernaak

Proceedings Volume 6906, 69060E (2008) https://doi.org/10.1117/12.773803

KEYWORDS: Clocks, Oscillators, Atomic clocks, Chemical species, Magnetism, Modulation, Semiconductor lasers, Optical pumping, Microwave radiation, Physics

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The end-resonance clock uses strong hyperfine end transition to stabilize the frequency of the local oscillator. Comparing to the conventional 0-0 atomic clock, end resonance has very small spin-exchange broadening effect. The spin-exchange rate is proportional to the number density of the alkali-metal atoms. By using the end resonance, we are able to use very high dense vapor to obtain a much better signal to noise ratio. On the other hand, the end resonance suffers from the first-order magnetic field dependence. This problem, however, can be solved by simultaneously using a Zeeman end resonance to stabilize the magnetic field. Here, we report the most recent result of the end-resonance clock. In addition, we report a whole new technique, push-pull laser-atomic oscillator, which can be thought as all-photonic clock. This new clock requires no local oscillator. It acts like a photonic version of maser, which spontaneously generates modulated laser light and modulated voltage signals. The modulation serves as the clock signal, which is automatically locked to the ground-state hyperfine frequency of alkali-metal atoms.

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