title: A two-state Raman coupler for coherent atom optics.
abstract: We present results on a Raman laser-system that resonantly drives a closed two-photon transition between two levels in different hyperfine ground states of (87)Rb. The coupler is based on a novel optical design for producing two phase-coherent optical beams to drive a Raman transition. Operated as an outcoupler, it produces an atom laser in a single internal atomic state, with the lower divergence and increased brightness typical of a Raman outcoupler. Due to the optical nature of the outcoupling, the two-state outcoupler is an ideal candidate for transferring photon correlations onto atom-laser beams. As our laser system couples just two hyperfine ground states, it has also been used as an internal state beamsplitter, taking the next major step towards free space Ramsey interferometry with an atom laser.
authors.affiliation: Australian Centre for Quantum Atom Optics, Department of Quantum Science, The Australian National University, Canberra, 0200, Australia.john.debs@anu.edu.au
authors.forename: J E
authors.initials: JE
authors.lastname: Debs
authors.forename: D
authors.initials: D
authors.lastname: Döring
authors.forename: N P
authors.initials: NP
authors.lastname: Robins
authors.forename: C
authors.initials: C
authors.lastname: Figl
authors.forename: P A
authors.initials: PA
authors.lastname: Altin
authors.forename: J D
authors.initials: JD
authors.lastname: Close
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007368:Interferometry / Q000295:instrumentation*; D054023:Lasers, Semiconductor; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013059:Spectrum Analysis, Raman / Q000295:instrumentation* / Q000379:methods