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Atomic Physics - Lund University Publications

We demonstrate a new laser cooling method suitable for a lithium atom interferometer. Although lithium is often used in ultra-cold atom experiments for its interesting physical properties and measurement feasibility, it is more difficult to laser cool lithium than other alkali atoms due to its unresolved hyperfine states, light mass (large recoil velocity) and high temperature from the oven. The laser cooling of atomic gases has revolutionized experimental atomic physics [1] and raised the prospect of a range of atomic quantum technologies [2,3]. However, traditional Doppler cooling [4,5] relies upon the velocity dependence of a single narrow radiative transition and spontaneous emission to reset the atomic state.

Laser cooling atom interferometer

( 1990 April -> 1993 August ) Atom interferometer using ultra cold metastable atoms. ( Jpn. J. Appl. Phys, vol. 34, 3298-3302 ) ( 1993 September -> 1995 March ) Cold Atom Inertial Sensors AI gyroscope (1997) Cold atom sensors: • 8 Laser cooling; ~10 atoms, ~uK (no cryogenics) • Atom is freely falling (inertial test mass) • Lasers measures motion of atom relative to sensor case • Accelerometers, gravimeters, gyroscopes, gradiometers AI compact gyroscope (2008) Technology evolution: Laser beams Glass cell: Laser Cooling Start with gas of rubidium atoms Shine lasers from all directions tuned below atomic resonance Doppler shift: - moving atoms scatter light from beam opposing motion Atoms slow down = cool Get sample of cold atoms: N ≈4×10 9 atoms T ≈250 µK n ≈3×10 11 cm-3 nΛ3 ≈5×10-7 →Limited by opacity of cloud This device, a customized laser system from the Muquans company, is designed for use in the challenging operating environment of the Laboratoire Souterrain à Bas Bruit (LSBB) in France, where a new large scale atom interferometer is being constructed underground - the MIGA antenna. These MgO:PPLN based laser systems have been used in several applications including, a demonstration of a quantum superposition over 54 centimetres [3], a precision gravimeter [4], a dual-species atom interferometer for BECs [5], and a new type of sensor which simultaneously measures gravity and magnetic field gradients to a high precision [6]. Laser Cooling Technology Laser cooling techniques are used to achieve the required velocity (wavelength) control for the atom source. Laser cooling: Laser light is used to cool atomic vapors to temperatures of ~10-6 Kelvin.

Coherent Atomic Manipulation and Cooling - LIBRIS

Close, J. D., Gray, M. B. Interferometric, modulation-free laser stabilization. laser source at 780 nm for laser cooling and manipulation of Rubidium.

Steven Chu - Biographical - NobelPrize.org

In our experiment, we show that clear interference signals may be obtained without laser cooling. Measuring the fine-structure constant with atom interferometry constitutes a low-energy, tabletop search for physics beyond the Standard Model, like dark matter. These measurements require laser cooling to slow particles and permit the long observation times required for sufficient precision and full quantum control. Last, it enables one to generate flat-top laser beams [30], which are of interest for light pulse atom interferometry. Here, a DM is used to control the laser wavefront in an atom interferometer. We demonstrate its ability and effi-ciency to correct the wavefront aberrations in a proof-of-principle experiment realized with an atomic gravimeter.

With pulses of light, we drive each atom into a quantum superpositions of having been kicked with the momentum of photons and not having been kicked. Laser cooling can be used, for example, in an atom interferometer that works by dropping a cloud of ‘cooled’ atoms.
Hur fungerar en hiss

Laser manipulation of atomic beam velocities: demonstration of stopped atoms and velocity reversal. W Ertmer, R Blatt, Interferometry with Bose-Einstein condensates in microgravity Doppler cooling and trapping on forbidden transitions.

Two wide-angle imaging neutral-atom spectrometersThe Two Wide-angle Imaging atom optics towards precision atom interferometry2011-08-08Atom optics has been a and the development of laser cooling and trapping of neutral atoms. •Atomic and molecular physics (gas phase). Soft X-ray beamline for Slit setting: 0-2000 μm, water cooling, insolated blades for vertical beam position sensing, on scanning and interferometer lasers for position control. FIXED STATIONS.
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Positionering, centrering, lutning, inriktning - Micro-Epsilon

These measurements require laser cooling to slow particles and permit the long observation times required for … 2009-05-01 Laser. cooling Detection. 1. Laser cool atoms • Microkelvin temperatures are routinely achieved with polarization gradient cooling 2. Launch atoms • Ramping laser frequencies launches cold atoms at velocity ~ m/s 3. Prepare internal atomic states • All atoms are put into the same initial quantum state 4.