Magic wavelengths of the optical clock transition at 877 nm of barium

2014 ◽  
Vol 28 (23) ◽  
pp. 1450183 ◽  
Author(s):  
Geng-Hua Yu ◽  
Qi-Ming Xu ◽  
Chao Zhou ◽  
Liang Liang ◽  
Long Li ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Optical Lattice ◽  
Optical Lattices ◽  
Optical Clock ◽  
Light Shift ◽  
Laser Trapping ◽  
Clock Transition ◽  
Linearly Polarized

Magic wavelengths for laser trapping of barium atoms in the optical lattices are investigated while considering the optical clock transition at 877 nm between the 6s21S0 state and 6s5d 1D2 state. Theoretical calculation shows that there are several magic wavelengths with the linearly polarized trapping laser. The trap depths of the optical lattice and the slope of light shift difference with different magic wavelengths are also discussed and analyzed. Some of these magic wavelengths are selected and recommended for the optical lattice trapping laser.

scholarly journals Absolute frequency measurement of the optical clock transition in with an uncertainty of using a frequency link to international atomic time

2017 ◽  
Vol 65 (5-6) ◽  
pp. 585-591 ◽  
Author(s):  
Charles F. A. Baynham ◽  
Rachel M. Godun ◽  
Jonathan M. Jones ◽  
Steven A. King ◽  
Peter B. R. Nisbet-Jones ◽  
...  
Keyword(s):  
Frequency Measurement ◽  
Optical Clock ◽  
Absolute Frequency ◽  
Clock Transition ◽  
Atomic Time

INTERACTING BOSONIC ATOMS WITH RANDOM POTENTIAL IN OPTICAL LATTICES

2009 ◽  
Vol 23 (11) ◽  
pp. 1391-1404
Author(s):  
WEI LIU ◽  
JIAN-YANG ZHU
Keyword(s):  
Optical Lattice ◽  
Optical Lattices ◽  
Mean Field Theory ◽  
Mean Field ◽  
Temperature Phase ◽  
Optical Parameters ◽  
Xxz Model ◽  
Bose Glass ◽  
The Mean ◽  
Bosonic Atoms

In this paper, we study the ultracold atoms in optical lattice with a weak random external potential by an extended Bose–Hubbard model. When the on-site interaction is strong enough, the model can be mapped to the XXZ model. Then the mean-field theory is applied and we get the zero- and finite-temperature phase diagrams in different optical parameters. The differences between the systems with and without disorder were found, and the Bose-glass phase may exist in the system with disorder.

scholarly journals When should we change the definition of the second?

2011 ◽  
Vol 369 (1953) ◽  
pp. 4109-4130 ◽  
Author(s):  
Patrick Gill
Keyword(s):  
Laser Cooling ◽  
Optical Lattice ◽  
Cold Atoms ◽  
International System ◽  
Atomic Clock ◽  
Optical Clock ◽  
Lattice Systems ◽  
System Of Units ◽  
Primary Standards ◽  
Definition Of

The microwave caesium (Cs) atomic clock has formed an enduring basis for the second in the International System of Units (SI) over the last few decades. The advent of laser cooling has underpinned the development of cold Cs fountain clocks, which now achieve frequency uncertainties of approximately 5×10 −16 . Since 2000, optical atomic clock research has quickened considerably, and now challenges Cs fountain clock performance. This has been suitably shown by recent results for the aluminium Al + quantum logic clock, where a fractional frequency inaccuracy below 10 −17 has been reported. A number of optical clock systems now achieve or exceed the performance of the Cs fountain primary standards used to realize the SI second, raising the issues of whether, how and when to redefine it. Optical clocks comprise frequency-stabilized lasers probing very weak absorptions either in a single cold ion confined in an electromagnetic trap or in an ensemble of cold atoms trapped within an optical lattice. In both cases, different species are under consideration as possible redefinition candidates. In this paper, I consider options for redefinition, contrast the performance of various trapped ion and optical lattice systems, and point to potential limiting environmental factors, such as magnetic, electric and light fields, collisions and gravity, together with the challenge of making remote comparisons of optical frequencies between standards laboratories worldwide.

Observation of the 1S0–3P0 optical clock transition in cold 199Hg atoms

2018 ◽  
Vol 16 (6) ◽  
pp. 060202 ◽  
Author(s):  
Xiaohu Fu Xiaohu Fu ◽  
Su Fang Su Fang ◽  
Ruchen Zhao Ruchen Zhao ◽  
Ye Zhang Ye Zhang ◽  
Junchao Huang Junchao Huang ◽  
...  
Keyword(s):  
Optical Clock ◽  
Clock Transition

scholarly journals Superradiance on the millihertz linewidth strontium clock transition

2016 ◽  
Vol 2 (10) ◽  
pp. e1601231 ◽  
Author(s):  
Matthew A. Norcia ◽  
Matthew N. Winchester ◽  
Julia R. K. Cline ◽  
James K. Thompson
Keyword(s):  
Cavity Mode ◽  
Optical Cavity ◽  
Atomic Clock ◽  
Laser Frequency ◽  
Gain Medium ◽  
Optical Clock ◽  
Frequency Noise ◽  
Clock Transition ◽  
Reference Cavity ◽  
High Finesse

Laser frequency noise contributes a significant limitation to today’s best atomic clocks. A proposed solution to this problem is to create a superradiant laser using an optical clock transition as its gain medium. This laser would act as an active atomic clock and would be highly immune to the fluctuations in reference cavity length that limit today’s best lasers. We demonstrate and characterize superradiant emission from the millihertz linewidth clock transition in an ensemble of laser-cooled 87Sr atoms trapped within a high-finesse optical cavity. We measure a collective enhancement of the emission rate into the cavity mode by a factor of more than 10,000 compared to independently radiating atoms. We also demonstrate a method for seeding superradiant emission and observe interference between two independent transitions lasing simultaneously. We use this interference to characterize the relative spectral properties of the two lasing subensembles.

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