All Publications


  • 40 W, 780 nm laser system with compensated dual beam splitters for atom interferometry OPTICS LETTERS Kim, M., Notermans, R., Overstreet, C., Curti, J., Asenbaum, P., Kasevich, M. A. 2020; 45 (23): 6555–58

    Abstract

    We demonstrate a narrow-linewidth 780 nm laser system with up to 40W power and a frequency modulation bandwidth of 230 MHz. Efficient overlap on nonlinear optical elements combines two pairs of phase-locked frequency components into a single beam. Serrodyne modulation with a high-quality sawtooth waveform is used to perform frequency shifts with >96.5% efficiency over tens of megahertz. This system enables next-generation atom interferometry by delivering simultaneous, Stark-shift-compensated dual beam splitters while minimizing spontaneous emission.

    View details for DOI 10.1364/OL.404430

    View details for Web of Science ID 000595610900055

    View details for PubMedID 33258860

  • Atom-Interferometric Test of the Equivalence Principle at the 10^{-12} Level. Physical review letters Asenbaum, P. n., Overstreet, C. n., Kim, M. n., Curti, J. n., Kasevich, M. A. 2020; 125 (19): 191101

    Abstract

    We use a dual-species atom interferometer with 2 s of free-fall time to measure the relative acceleration between ^{85}Rb and ^{87}Rb wave packets in the Earth's gravitational field. Systematic errors arising from kinematic differences between the isotopes are suppressed by calibrating the angles and frequencies of the interferometry beams. We find an Eötvös parameter of η=[1.6±1.8(stat)±3.4(syst)]×10^{-12}, consistent with zero violation of the equivalence principle. With a resolution of up to 1.4×10^{-11}  g per shot, we demonstrate a sensitivity to η of 5.4×10^{-11}/sqrt[Hz].

    View details for DOI 10.1103/PhysRevLett.125.191101

    View details for PubMedID 33216577