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Quantum Electronics and Laser Science Conference

Laser cooling of atoms towards quantum degeneracy or BEC

Vladan Vuletić, Cheng Chin, Andrew J. Kerman, Steven Chu

Published May 7, 2000• 0 citations
OpenAlex

Abstract

Summary form only given. High-brightness sources of cold atoms prepared by laser cooling have many applications in precision experiments and Bose-Einstein condensation. While in optical molasses the temperature increases strongly with atomic density, tight confinement of atoms in the Lamb-Dicke regime in an optical lattice allows to extend laser cooling to higher atomic densities, and subsequent adiabatic release from the lattice can be used to convert the high local density into low kinetic energy at constant bulk density. For an initial temperature in the lattice that is smaller than the vibrational spacing, free-space temperatures near or below the recoil limit can be reached.

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Summary form only given. High-brightness sources of cold atoms prepared by laser cooling have many applications in precision experiments and Bose-Einstein condensation. While in optical molasses the temperature increases strongly with atomic density, tight confinement of atoms in the Lamb-Dicke regime in an optical lattice allows to extend laser cooling to higher atomic densities, and subsequent adiabatic release from the lattice can be used to convert the high local density into low kinetic energy at constant bulk density. For an initial temperature in the lattice that is smaller than the vibrational spacing, free-space temperatures near or below the recoil limit can be reached.
Summary form only given. Recently, we have created a Bose condensate of /sup 87/Rb atoms directly in an optical trap formed by tightly focused laser beams. Following initial loading from a laser cooled gas, evaporative cooling through the BEC transition is achieved by simply lowering the depth of the optical trap. Our success is due in part to a high initial phase space density realized in the loading of our optical dipole trap and in part to the tight confinement of the atoms that permits rapid evaporative cooling to the BEC transition in 2 s.
Summary form only given. Techniques for cooling and trapping atoms now provide unique capabilities for the manipulation of atoms. In particular, they make possible very low temperatures, extraordinarily high atomic phase space densities, and long perturbation-free observation times. These capabilities enable one to carry out many new measurements on atoms with great precision and/or in entirely new regimes of temperature and density. This tutorial will concentrate primarily on the practical aspects of how to apply current laser cooling and trapping techniques. This will include descriptions of the various techniques and their capabilities, as well as a discussion of tradeoffs between price, complexity, and various performance parameters. Finally, I will briefly discuss how these techniques are applied in a number of specific cases including cold collisions, precision measurements including atomic clocks, atom interferometry, collecting radioactive isotopes, and the creation of Bose-Einstein condensates.
Of the many applications of lasers, the one with possibly the most dramatic impact on fundamental physics is laser cooling and trapping: the Nobel Prize for physics was awarded for laser cooling in 1997. Laser cooling allows one to obtain samples of atoms essentially at rest, with temperatures in the micro-Kelvin region being routine. At such low temperatures, it becomes easy to trap or move atoms with modest electromagnetic forces and a whole new class of experiments previously confined to the realm of fantasy becomes possible. The high brightness of masers and lasers makes it possible to access a regime of atomic excitation for which Einstein’s rate equations are inadequate. Three-dimensional optical molasses using counter-propagating laser beams along three mutually orthogonal directions was first observed in 1985 by Chu et al. The Sisyphus mechanism works well for atoms that are already cold and has a smaller capture velocity than conventional Doppler cooling.
We present a simple and general optical cooling method based on 3D degenerate Raman sideband cooling with adiabatic release that goes significantly beyond the density and temperature limitations of optical molasses. In 10 ms we cool a sample of 3×108 cesium atoms to a temperature of 330 nK at a density of 1.1×1011 cm−3, which corresponds to a phase-space density nλdB3=1/500.We further propose to cool atoms or molecules inside an optical cavity that enhances the scattering of blue-detuned photons and show that the dissipative mechanism can be viewed as a cavity-induced generalized Doppler cooling. Since the cooling depends on the atom’s internal level structure only through the photon scattering rate, cavity Doppler cooling is applicable to particles that do not possess a closed optical transition, which may allow one to extend laser cooling to a greater class of atoms or molecules. Large samples are cooled at the same rate as single atoms if the effect of one atom on the cavity resonance frequency is small. We also show how to achieve 3D cooling with a single optical cavity.
Introduction and review of quantum mechanics: Review of Quantum Mechanics.- The Density Matrix.- Force on Two-Level Atoms.- Multi-Level Atoms.- General Properties Concerning Laser Cooling. Cooling and Trapping: Deceleration of an Atomic Beam.- Optical Molasses.- Cooling Below the Doppler Limit.- The Dipole Force.- Magentic Trapping of Neutral Atoms.- Optical Traps for Neutral Atoms.- Evaporative Cooling. Applications: Newtonian Atom Optics.- Ultra-Cold Collisions.- deBrooglie-Wave Optics.- Optical Lattices.- Bose -Einstein Condensation.- Dark States.
We propose a laser cooling scheme that allows to cool a single atom confined in a harmonic potential to the trap ground state ∣0>|0>∣0>. The scheme assumes strong confinement, where the oscillation frequency in the trap is larger than the effective spontaneous decay width, but is not restricted to the Lamb-Dicke limit, i.e. the size of the trap ground state can be larger than the optical wavelength. This cooling scheme may be useful in the context of quantum computations with ions and Bose-Einstein condensation.