Phys. Rev. Lett. 102, 163601 (2009) [4 pages]Prospects for a Millihertz-Linewidth Laser
We propose a new light source based on having alkaline-earth atoms in an optical lattice collectively emit photons on an ultranarrow clock transition into the mode of a high Q resonator. The resultant optical radiation has an extremely narrow linewidth in the mHz range, even smaller than that of the clock transition itself due to collective effects. A power level of order 10-12 W is possible, sufficient for phase locking a slave optical local oscillator. Realizing this light source has the potential to improve the stability of the best clocks by 2 orders of magnitude. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.163601
DOI:
10.1103/PhysRevLett.102.163601
PACS:
42.50.Nn, 06.30.Ft, 37.10.Jk, 37.30.+i
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