Bulletin of the American Physical Society
2006 37th Meeting of the Division of Atomic, Molecular and Optical Physics
Tuesday–Saturday, May 16–20, 2006; Knoxville, TN
Session C1: Optical Clocks |
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Chair: David Weiss, Penn State University Room: Knoxville Convention Center Lecture Hall |
Wednesday, May 17, 2006 10:30AM - 11:06AM |
C1.00001: Femtosecond laser frequency combs and their applications in AMO physics Invited Speaker: A femtosecond laser frequency comb (FLFC) is the broadband, evenly-spaced array of optical frequencies that is present in the output of a femtosecond mode-locked laser. Such frequency combs have found wide-spread use in optical frequency metrology and optical atomic clocks, and now their role in other precision measurements is beginning to emerge. Beyond a general overview of FLFC's, in this talk we will cover the following topics: (1) Recent advances in the generation of octave-spaning combs directly from Ti:sapphire lasers as well as our efforts to produce more energy efficient and robust frequency combs that should be useful for transportable instruments. (2) Highly dispersive elements, like the so-called VIPA (Virtually Imaged Phased Array), that now permit the spatial separation of the frequency comb elements with a resolution approaching 1 GHz. This provides access to the individual comb elements and opens new possibilities in arbitrary waveform generation, spectroscopic sensing, and secure optical communications. (3) The use of optical frequency combs for direct atomic spectroscopy, as well as the comparison of microwave and optical frequency standards with uncertainty below 1e-15. [Preview Abstract] |
Wednesday, May 17, 2006 11:06AM - 11:42AM |
C1.00002: Laser-cooled Atomic Clocks Invited Speaker: The talk will review the recent advances of atomic clocks using laser-cooled atoms that have lead to accuracies approaching 1 part in 10$^{16}$. A major impediment has been the frequency shift due to cold collisions. Solutions to the cold collision frequency shift include fountains based on Rubidium atoms and the use of adiabatic fast passage to accurately evaluate the cold collision frequency shift. The current-state-of-the-art and an outlook for future microwave and optical atomic clocks will be given. [Preview Abstract] |
Wednesday, May 17, 2006 11:42AM - 12:18PM |
C1.00003: TBD Invited Speaker: |
Wednesday, May 17, 2006 12:18PM - 12:54PM |
C1.00004: Laser Technology in Commercial Atomic Clocks Invited Speaker: Commercial atomic frequency standards (AFS) are deployed in diverse civilian, military, and aerospace applications, ranging from high-precision measurement and calibration to navigation, communications and, of course, timekeeping. Currently, commercially available AFS include magnetically-selected cesium beam frequency standards and hydrogen masers and lamp-pumped rubidium oscillators. Despite the revolution in atomic physics and laboratory-scale AFS brought about by the advent of the tunable laser in the early 1970s, commercial AFS invariably rely on more conventional atomic physics technology developed in the 1950s. The reason for this lack of advancement of commercial AFS technology is the relatively poor reliability and environmental sensitivity of narrow-linewidth single-mode laser sources at atomic resonance wavelengths. Over the past 8 years, Symmetricom, in collaboration with laser manufacturers, has developed specialized laser sources for commercial AFS applications. These laser devices, optimized for high spectral purity and long-term reliability, will enable a new generation of commercial AFS. This talk will briefly describe two laser-based atomic frequency standard development programs at Symmetricom. The Chip-Scale Atomic Clock, two orders of magnitude smaller and lower power than any commercial AFS, will enable atomic timing accuracy in portable battery-powered applications. The Optically-Pumped Cesium Beam Frequency Standard, under development for deployment onboard the GPS-III satellite constellation, will provide enhanced short-term stability and longer lifetime compared to magnetically-selected cesium beam AFS. [Preview Abstract] |
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