Dr. Olson graduated from the University of Massachusetts Medical School in 1988. She works in Keene, NH and 1 other location and specializes in Psychiatry and Neurology. Dr. Olson is affiliated with Brattleboro Memorial Hospital, Cheshire Medical Center Dartmouth-Hitchcock Keene and Dartmouth Hitchcock Medical Center.
- Boulder CO, US Judith OLSON - Northglenn CO, US Andrew KORTYNA - Boulder, IS Dina GENKINA - Hyattsville MD, US Flavio CRUZ - CO, US
International Classification:
G04F 5/14 H03L 7/26
Abstract:
A rubidium optical atomic clock uses a modulated 778 nanometer (nm) probe beam and its reflection to excite rubidium 87 atoms, some of which emit 758.8 nm fluorescence as they decay back to the ground state. A spectral filter rejects scatter of the 778 nm probe beams while transmitting the 775.8 nm fluorescence so that the latter can be detected with a high signal-to-noise ratio. Since the spectral filter is only acceptably effective at angles of incidence less than 8 from the perpendicular, the atoms are localized by a magneto-optical trap so that most of the atoms lie within a conical volume defined by the 8 angle so that the resulting fluorescence detection signal has a high signal-to-noise ratio. The fluorescence detection signal can be demodulated to provide an error signal from which desired adjustments to the oscillator frequency can be calculated.
Frequency Modulation Spectroscopy With Localized Fluorescence
- Boulder CO, US Judith OLSON - Northglenn CO, US Andrew KORTYNA - Boulder CO, US Dina GENKINA - Hyattsville MD, US Flavio CRUZ - Superior CO, US
International Classification:
H03L 7/26 G04F 5/14
Abstract:
A frequency-modulated spectrometry (FMS) output is used to stabilize an atomic clock by serving as an error signal to regulate the clock's oscillator frequency. Rubidium 87 atoms are localized within a hermetically sealed cell using an optical (e.g., magneto-optical) trap. The oscillator output is modulated by a sinusoidal radio frequency signal and the modulated signal is then frequency doubled to provide a modulated 788 nm probe signal. The probe signal excites the atoms, so they emit 775.8 nm fluorescence. A spectral filter is used to block 788 nm scatter from reaching a photodetector, but also blocks 775.8 nm fluorescence with an angle of incidence larger than 8 relative to a perpendicular to the spectral filter. The localized atoms lie within a conical volume defined by the 8 effective angle of incidence so an FMS output with a high signal-to-noise ratio is obtained.
ter in the eastern Wisconsin hamlet of Cedar Grove, was rejected due to the missing witness information. That of Judith Olson, 88, a resident of the northern town of Elk, was accepted, according to incident logs viewed by Reuters in which Wisconsin election offices document irregular ballots. Hougl