Accession Number : ADA337451

Title :   Cooling and Trapping of Atoms and Particles

Descriptive Note : Final rept. 1 Nov 94-31 Oct 97

Corporate Author : STANFORD UNIV CA

Personal Author(s) : Chu, Steve

PDF Url : ADA337451

Report Date : 31 OCT 1997

Pagination or Media Count : 8

Abstract : A number of atom interferometry methods have been introduced and the state of the art in precision atom interferometry have been advanced. An interferometer using laser cooled atoms in an atomic fountain and off-resonant optical Raman pulses between ground states of the atom has been applied to the measurement of the ratio of planck's constant to mass, which is a step in the determination of the fine structure constant. The result has surpassed the next best measurement (the Quantum Hall Effect measurement) by a factor of ten in precision. Also, using an atomic interferometer as an accelerometer, the value of g has been measured and compared to that of the previous best absolute gravimeter (based on a falling corner-cube optical interferometer) with comparable results. Using 'optical tweezers' based on laser trapping techniques, experimental verification of the reputation theory of polymer dynamics, developed by de Genes twenty-five years ago, have been achieved. Other techniques and measurements have been unable to provide the needed verification.

Descriptors :   *INTERFEROMETRY, HALL EFFECT, QUANTUM THEORY, TRAPPING(CHARGED PARTICLES), ATOMS, LASERS, COOLING, GRAVIMETRY, INTERFEROMETERS.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE