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Phys Rev Lett. 2007 May 25;98(21):213902. Epub 2007 May 25.

Saturated optical absorption by slow molecules in hollow-core photonic band-gap fibers.

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  • 1Danish Fundamental Metrology Ltd., Matematiktorvet 307, DK-2800 Kgs. Lyngby, Denmark.


We report on saturated absorption in a hollow-core photonic band-gap fiber filled with 12C2H2 molecules. We find that slow molecules provide a major contribution to the signal in the limit of low optical power and low pressure where the signal deviates significantly from the usual Lorentzian line shape. In particular, we observe a linewidth reduction of about 3 times as compared to the transit-time limited linewidth.

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