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A 85 Rb coherent population trapping atomic clock - IEEE ...

The rubidium vapor cell is fabricated by glass-silicon anodic bonding techniques. We use two different buffer gases (Ar and Ne) that produce opposite shift rates to reduce the dependence of the clock frequency stability on the temperature stability of the atoms. We use the ceramic-filled coaxial resonator as the RF resource.

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Laser Cooling of Rubidium Atoms in a Vapor Cell 425 Fig. 1. Basic principle of the magneto-optical trap in one dimension. The atoms have an angular momentum of J = 0 (m, = 0) in the ground state and J' = 1 (ml. = - 1, 0, + 1) in the excited state. They interact with counter-propagating laser beams, which are U+ and U- circularly polarized of

The Prospects For Creating Lightsabers | The Forteana …

Working with colleagues at the Harvard-MIT Center for Ultracold Atoms, a group led by Harvard Professor of Physics Mikhail Lukin and MIT Professor of Physics Vladan Vuletic have managed to coax photons into binding together to form molecules – a state of matter that, until recently, had been purely theoretical.

Fermions chill out | Nature

Rubidium atoms belong to a class of particles called bosons, which gang up together into a condensate relatively easily. ... They used a magnetic field to …

Atom laser fits on a chip TRN 101701 - trnmag.com

To coax the rubidium atoms to form a Bose-Einstein condensate the researchers used the standard method of several cycles of evaporation to cool them to less than one degree above absolute zero. The efficiency of their trap also reduced the cooling time of the atoms, allowing them to create a Bose-Einstein condensate in less than one second ...

Physicists Create a New State of Matter - Scientific American

The atoms lose their individuality and merge into a single quantum state, forming what is known as a Bose-Einstein condensate (BEC). ... To coax their rubidium BEC into switching states, Markus ...

Physicists Create a New State of Matter - Scientific American

The atoms lose their individuality and merge into a single quantum state, forming what is known as a Bose-Einstein condensate (BEC). ... To coax …

Looking for Hofstadter's Butterfly in Cold Atoms - Physics

As reported in Physical Review Letters [7, 8], both groups placed rubidium atoms in an optical lattice and used external lasers to coax the atoms …

Tabletop astrophysics | Nature

They used new laser-cooling technology to coax a low-pressure gas of rubidium atoms to close to absolute zero and into a BEC 1. The rubidium atoms remain as a gas throughout the transition to a ...

What Are The Fifth And Sixth States Of Matter? - Forbes

A Bose-Einstein condensate of rubidium atoms before (L), during (middle) and ... leveraging a strong magnetic field along with ultra-cold …

New internet woven from 'spooky' quantum links could ...

Atoms of rubidium, a heavy cousin of the more familiar lithium and sodium, are appealing because their internal quantum states can be set and controlled by light. In Figueroa's lab, entangled photons from the frequency-splitting crystal enter plastic cells containing 1 trillion or so rubidium atoms each.

Researchers coax photons into binding together to form ...

Sep 25, 2013: Researchers coax photons into binding together to form molecules - a new form of matter (Nanowerk News) Harvard and MIT scientists are challenging the conventional wisdom about light, and they didn't need to go to a galaxy far, far away to do it.Working with colleagues at the Harvard-MIT Center for Ultracold Atoms, a group led by Harvard Professor …

Hyperfine Structure of Rubidium

Hyperfine Structure of Rubidium Phys 1560 & 2010 – Brown University – Nov 2, 2011 ... If we direct a laser at a collection of Rb atoms, photons cause transitions between states whenever the energy is an exact match; this absorption of energy can be measured to …

Hyperfine Structure of Rubidium - AAPT

Hyperfine Structure of Rubidium Phys 1560 & 2010 – Brown University – October 2010 ... If we direct a laser at a collection of Rb atoms, photons cause transitions between states whenever the energy is an exact match; this absorption of energy can …

Λ-enhanced grey molasses on the D2 transition of …

Scheme of the energy levels of the D2 transition in 87 Rb. Red arrows represent the two frequencies employed for the grey molasses; cooler (repumper) is blue-detuned with respect to the F = 2 (1 ...

Nobel laureate to explain atom research

To coax a mixture of atoms into behaving identically -- as they would in a Bose-Einstein condensate -- the atoms need to be slowed considerably. This …

Optical Pumping of Rubidium Vapor

Optical Pumping of Rubidium Vapor D.C. Elton1, a) and J. Chia-Yib) Stony Brook University (Dated: 27 April 2012) We studied the hyper ne levels of Rubidium using the technique of optical pumping. Using the equation 0 = g J 0 h(2I+1) Bfor Rb-87 we found g F = 0:5177 :0002 and B earth = 0:416 :0002. For Rb-85 we found g F = 0:342 :0001 and B ...

The internet goes quantum

Atoms of rubidium, a heavy cousin of the more familiar lithium and sodium, are appealing because their internal quantum states can be set and controlled by light. In Figueroa's lab, entangled photons from the frequency-splitting crystal enter plastic cells containing 1 trillion or so rubidium atoms each.

TECHNICAL MANUAL TM0110-2 - WA6VHS

plied on an SMA coax connector. ... microwave signal is used to resonate vaporized rubidium atoms within a sealed glass Rb resonance cell that is placed in a low Q microwave cavity. Frequency Electronics, Inc. Sheet 10 TM0110-2 NOV 2000. The microwave frequency generation method is designed so that the VCXO frequency is ...

An experimental and theoretical guide to strongly ...

For two rubidium atoms in the 43S state, the van der Waals coefficient is C 6 = −1.697 × 10 19 au = −h × 2441 MHz μm 6. If we now take a typical density of n = 10 12 cm −3 (mean distance m) in an ultracold atomic cloud and assume that all atoms reside in a Rydberg state, then the average interaction energy reaches h × 2441 MHz per ...

Using Resonating Superconducting Cavities ... - Warwick

called corrugated rigid coax or by wave guide. The microwaves interact with Rubidium atoms that are fired into the cavity by an oven. The atoms are fired in a beam at a speed such that less than one atom is in the cavity at any one time, with a narrow velocity distribution. For this reason the system is called a micromaser [1].

Physicists create a new form of light by binding photons

The scientists were able to coax photons to interact with another, similarly to how atoms attract or repel each other in ordinary matter. ... The team chilled rubidium atoms close to absolute zero ...

FE_5650A.pdf

FE_5650A.pdf,TM0107 FEB 1998 TECHNICAL MANUAL TM0107 RUBIDIUM FREQUENCY STANDARD MODEL FE-5650A SERIES OPERATION AND MAINTENANCE INSTRUCTIONS FREQUENCY ELECTRONICS, INC.

Yosuke ITO | Junior Associate Professor | Ph. D | Kyoto ...

Yosuke ITO, Junior Associate Professor | Cited by 588 | of Kyoto University, Kyoto (Kyodai) | Read 34 publications | Contact Yosuke ITO

Seeing light in a new light | EurekAlert!

Researchers began by pumped rubidium atoms into a vacuum chamber, then used lasers to cool the cloud of atoms to just a few degrees above absolute zero. Using extremely weak laser pulses, they ...

Evaporative Coating of Rb Maser Cells - Harvard University

2 as well as rubidium. These gases (in addition to playing active roles in the noble gas experiments) act as a bu er, keeping the Rb away from the walls of the cell. In the DBRM the lack of bu er gases allows rubid-ium atoms to e use between the pumping and masing chambers of the device. Without a bu er gas, however, the device is very

Insights Flow From Ultracold Atoms That Mimic ... - Science

That makes it a boson, and any number of identical bosons can squeeze into one quantum wave. So when physicists chill rubidium-87 gas to below a millionth of a kelvin, the atoms pile into the lowest energy wave to make a superfluid BEC. Atoms with an odd number of protons, neutrons, and electrons are far less gregarious.

A Magnetic Trap for Evaporative Cooling of Rb Atoms

trap neutral atoms [11], consists of two identical coaxial coils carrying currents in opposite directions (Anti-Helmholtz coils) (Fig. 1.1). A simple configuration is an axially symmetric trap, which gives a linear potential with xˆ · dB~ dx = ˆy · dB~ dy = −2ˆz · dB~ dz, (1.4) 1The depth of our trap is estimated in section 4.1.

Physicists coax superfluid to have 'negative mass'

Physicists coax superfluid to have 'negative mass' ... When the rubidium atoms are allowed to flow out of the bowl fast enough, the superfluid behaves as it had negative mass.