Direct frequency comb measurements of absolute optical frequencies and population transfer.pdf

Direct frequency comb measurements of absolute optical frequencies and population transfer.pdf

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Direct frequency comb measurements of absolute optical frequencies and population transfer

a r X i v : p h y s i c s / 0 5 0 3 1 0 4 v 1 [ p h y s i c s .a t o m - p h ] 1 3 M a r 2 0 0 5 7S/5P-Marian Direct frequency comb measurements of absolute optical frequencies and population transfer dynamics Adela Marian, Matthew C. Stowe, Daniel Felinto*, and Jun Ye JILA, National Institute of Standards and Technology and University of Colorado Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA (Dated: February 2, 2008) A phase-stabilized femtosecond laser comb is directly used for high-resolution spectroscopy and absolute optical frequency measurements of one- and two-photon transitions in laser-cooled 87Rb atoms. Absolute atomic transition frequencies, such as the 5S1/2 F=2 → 7S1/2 F”=2 two- photon resonance measured at 788 794 768 921(44) kHz, are determined without a priori knowledge about their values. Detailed dynamics of population transfer driven by a sequence of pulses are uncovered and taken into account for the measurement of the 5P states via resonantly enhanced two-photon transitions. PACS numbers: 32.80.-t, 39.30.+w, 32.80.Qk, 39.25.+k Phase-stabilized optical frequency combs based on mode-locked femtosecond lasers have formed a power- ful connection between the fields of precision measure- ment and ultrafast science [1, 2, 3]. Numerous applica- tions have ensued, including measurements of absolute optical frequencies [4, 5, 6] and the development of op- tical atomic clocks [7, 8, 9]. Recent work has demon- strated that optical frequency combs are a highly efficient tool for precise studies of atomic structure [10, 11]. Di- rect frequency comb spectroscopy (DFCS) has been per- formed on the 5S-5D two-photon transitions in Rb, per- mitting high-resolution spectroscopy of all atomic transi- tions covered by the comb bandwidth. Additionally, this approach provides significant advantages for precise stud- ies of time domain dynamics, coherent accumulation and interference, and quantum control [11]. An extension of f

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