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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Prospects for optical clocks with a blue-detuned lattice.

M Takamoto¹, H Katori, S I Marmo

¹Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, 113-8656 Tokyo, Japan and CREST, Japan.

Physical Review Letters

|March 5, 2009

Summary

This summary is machine-generated.

We determined the magic wavelength for strontium-87 optical lattice clocks to be 389.889(9) nm. This minimizes light-shift errors, achieving a 2x10^-19 uncertainty from hyperpolarizability effects.

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Area of Science:

Atomic Physics
Quantum Metrology
Optical Clocks

Background:

Optical lattice clocks offer high precision for timekeeping.
Light-shift potentials can perturb atomic clock transitions.
Minimizing these perturbations is crucial for accuracy.

Purpose of the Study:

To investigate optical lattice clocks using repulsive light-shift potentials.
To experimentally determine the magic wavelength for 87Sr.
To theoretically analyze hyperpolarizability effects on clock transitions.

Main Methods:

Operation of optical lattice clocks with a repulsive light-shift potential.
Experimental determination of the magic wavelength for 87Sr.
Theoretical investigation of hyperpolarizability effects.

Main Results:

The magic wavelength for 87Sr was experimentally determined to be 389.889(9) nm.
Hyperpolarizability effects were theoretically investigated.
A fractional uncertainty of 2x10^-19 due to hyperpolarizability was found with minimal trapping field perturbation.

Conclusions:

The determined magic wavelength minimizes light-shift perturbations in 87Sr optical lattice clocks.
Blue-detuned lattices provide minimal trapping field perturbation.
Hyperpolarizability effects contribute minimally to the clock's uncertainty.