Hyper-Ramsey Spectroscopy of Optical Clock Transitions (2009)
Taichenachev, A. V., Yudin, V. I., Oates, C. W., Barber, Z. W., Lemke, N. D., Ludlow, A. D., ...
We present a generalized optical Ramsey scheme that uses pulses individually tailored in duration, phase, and frequency to suppress spurious frequency shifts related to the excitation itself. In this...
Rabi Spectroscopy and Excitation Inhomogeneity in a 1D Optical Lattice Clock (2009)
Blatt, S., Thomsen, J. W., Campbell, G. K., Ludlow, A. D., Swallows, M. D., Martin, M. J., ...
We investigate the influence of atomic motion on precision Rabi spectroscopy of ultracold fermionic atoms confined in a deep, one dimensional (1D) optical lattice. We analyze the spectral components...
Spin-1/2 Optical Lattice Clock (2009)
Lemke, N. D., Ludlow, A. D., Barber, Z. W., Fortier, T. M., Diddams, S. A., Jiang, Y., ...
We experimentally investigate an optical clock based on $^{171}$Yb ($I=1/2$) atoms confined in an optical lattice. We have evaluated all known frequency shifts to the clock transition, including a...
Taichenachev, A. V., Yudin, V. I., Oates, C. W., Barber, Z. W., Lemke, N. D., Ludlow, A. D., ...
We have extended Ramsey spectroscopy by stepping the probe frequency during the two Ramsey excitation pulses to compensate frequency shifts induced by the excitation itself. This makes precision...
Probing Interactions between Ultracold Fermions (2009)
Campbell, G. K., Boyd, M. M., Thomsen, J. W., Martin, M. J., Blatt, S., Swallows, M. D., ...
At ultracold temperatures, the Pauli exclusion principle suppresses collisions between identical fermions. This has motivated the development of atomic clocks using fermionic isotopes. However, by...
Ludlow, A. D., Zelevinsky, T., Campbell, G. K., Blatt, S., Boyd, M. M., ...
Optical atomic clocks promise timekeeping at the highest precision and accuracy, owing to their high operating frequencies. Rigorous evaluations of these clocks require direct comparisons between...
Blatt, S., Ludlow, A. D., Campbell, G. K., Thomsen, J. W., Zelevinsky, T., Boyd, M. M., ...
The $^1\mathrm{S}_0$-$^3\mathrm{P}_0$ clock transition frequency $\nu_\text{Sr}$ in neutral $^{87}$Sr has been measured relative to the Cs standard by three independent laboratories in Boulder,...
Compact, thermal-noise-limited optical cavity for diode laser stabilization at 1 x 10-15 (2006)
Ludlow, A. D., Huang*, X., Notcutt, M., Zanon, T., Foreman, S. M., Boyd, M. M., ...
We demonstrate phase and frequency stabilization of a diode laser at the thermal noise limit of a passive optical cavity. The system is compact and exploits a cavity design that reduces vibration...
Dynamic cancellation of ac Stark shift for pulsed EIT/Raman optical lattice clocks (2006)
Zanon-Willette, T., Ludlow, A. D., Blatt, S., Boyd, M. M., Arimondo, E., Ye, * Jun
We propose a combination of Electromagnetically Induced Transparency (EIT)/Raman and pulsed spectroscopy techniques to accurately cancel frequency shifts arising from EIT fields in forbidden optical...
Narrow Line Photoassociation in an Optical Lattice (2006)
Zelevinsky, T., Boyd, M. M., Ludlow, A. D., Ido, T., Ye, J., Ciurylo, R., ...
With ultracold $^{88}$Sr in a 1D magic wavelength optical lattice, we performed narrow line photoassociation spectroscopy near the $^1$S$_0 - ^3$P$_1$ intercombination transition. Nine least-bound...
Two-photon absorption in potassium niobate (2001)
Ludlow, A. D., Nelson, H. M., Bergeson, S. D.
We report measurements of thermal self-locking of a Fabry-Perot cavity containing a potassium niobate (KNbO3) crystal. We develop a method to determine linear and nonlinear optical absorption...