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Chinese Journal of Quantum Electronics

Generation of cold or ultracold atomic beams and their applications

Yin Jian-Ping

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

The basic principles, methods and experimental results on the generation of cold or ultracold atomic beams and their recent progresses are reviewed. The schemes to produce cold or ultracold atomic beams by laser cooling (Doppler, sub-Doppler and sub-recoil cooling) and magneto-optical trapping technique are introduced in detail, and the applications of cold or ultracold atomic beams in the studies of basic physical problems and atom optics are briefly introduced.

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Progress in physics•Jan 1, 2005•0 citations
The basic principles, methods and experimental results on the generation of cold or ultracold atomic beams and their recent progresses are reviewed. The schemes to produce cold or ultracold atomic beams by laser cooling (Doppler, sub-Doppler and sub-recoil cooling) and magneto-optical trapping technique are introduced in detail, and the applications of cold or ultracold atomic beams in the studies of basic physical problems and atom optics are briefly introduced.
Abstract The extension of laser cooling and trapping techniques from atoms to molecules is currently the subject of intense and growing interest. Molecular laser cooling and trapping offers a general technique applicable to a variety of molecules with different properties and internal structures and is well-suited to the growing list of proposed applications for ultracold molecules. The recent development of optical cycling schemes for specific molecular species now allow each molecule to scatter up to ∼10 6 photons. This has proven sufficient for multiple groups to laser cool and slow molecular beams and, notably, capture molecules in magneto-optical traps (MOTs) and cool them to ultracold temperatures. MOTs are the workhorse technique for atomic physics in the ultracold regime and today’s molecular MOTs represent a powerful starting point for the study and manipulation of ultracold molecular gases. This Topical Review presents a summary of the progress made in this new and emerging field.
Progress on research in the field of molecules at cold and ultracold temperatures is reported in this review. It covers extensively the experimental methods to produce, detect and characterize cold and ultracold molecules including association of ultracold atoms, deceleration by external fields and kinematic cooling. Confinement of molecules in different kinds of traps is also discussed. The basic theoretical issues related to the knowledge of the molecular structure, the atom–molecule and molecule–molecule mutual interactions, and to their possible manipulation and control with external fields, are reviewed. A short discussion on the broad area of applications completes the review.
Atom optics has seen fast development and vast achievements,and has wide application prospects.The basic principles of the manipulation and control of cold atoms using magnetic and laser fields are briefly introduced,followed by a detailed review of recent progress of geometric and wave atom optics as well as potential applications and the development of atom optics devices Topics include the reflection of atom beams and mirrors,the deflection(refraction) and focusing of atom beams and lenses,the diffraction of atom matter waves and gratings,atom interferometers,and atomic holography.
This review describes the methods of trapping cold atoms in electromagnetic fields and in the combined electromagnetic and gravity fields. We discuss first the basic types of the dipole radiation forces used for cooling and trapping atoms in the laser fields. We outline next the fundamentals of the laser cooling of atoms and classify the temperature limits for basic laser cooling processes. The main body of the review is devoted to discussion of atom traps based on the dipole radiation forces, dipole magnetic forces, combined dipole radiation-magnetic forces, and the forces combined of the dipole radiation-magnetic and gravity forces. Physical fundamentals of atom traps operating as waveguides and cavities for cold atoms are also considered. The review ends with the applications of cold and trapped atoms in atomic, molecular and optical physics.
The interaction of laser radiation with matter is widely used to cool atomic and molecular gases to extremely low temperatures. In connection with this, a considerable number of works on quantum optics have recently been devoted to laser cooling of matter. The principle of Doppler cooling for neutral atoms was proposed by T. Nanch and A. Shavlov, and for trapped ions by D. Wineland and H. Dehmelt. The chapter shows the scheme of the principle of Doppler cooling. The atomic beam is slowed by transmission of a pulse that occurs at the time when the atom absorbs a quantum of light. When laser cooling of atoms in a certain volume, a problem arises with optical pumping. The scheme of cooling an atomic beam by laser radiation in a magnetic field, called the Zeeman slowing, is most often used to obtain slow atomic beams.
With the fast development and perfecting of laser cooling, trapping and manipulating of neutral atoms as well as microelectric fabrication techniques with micrometer and nanometer scale, a new branch subject of atom optics, atom optics and its atom has been formed. In this lecture, we mainly introduce integrated schemes and experimental results as well as recent progress of integrated atom optics and its atom chips, including the design schemes, microfabrication techniques and recent experimental results of atom optical elements and devices with surface microstructures, magnetic microstructure integrated atom optics, all optical microstructure integrated atom optics,and magneto-optical microstructure integrated atom optics and their atom chips. Finally, design principles of integrated atom chip and its open problems are discussed, and some potential application of integrated atom optics and its future development are briefly looked ahead.