We investigated two methods of producing a continuous free beam of electron-spin polarized atomic hydrogen, using a 7.5 T solenoid magnetic field and a helium film-coated cell . The first method involves accumulating H 1 at high field in a 300 mK storage cell and flipping the electron spin by using microwaves to drive a hyperfine transition . The resulting HT atoms are accelerated and focused b...

We describe the recent progress in our cesium atomic fountains at National Metrology Institute of Japan (NMIJ). We have developed three atomic fountains: NMIJ-F1, NMIJ-F2, and a truncated atomic beam fountain. NMIJ-F1 has been the primary frequency standard with uncertainty of 4×10 -15 since 2004. Especially in the last 4 years, we have reported the data to Bureau International des Poids et Mes...

We experimentally demonstrate cavity field control by another laser beam with three-level L-type atoms inside an optical ring cavity. By adjusting the frequency detuning of the controlling beam ~coupled to one of the atomic transitions!, the intensity of the cavity field interacting with another atomic transition is switched on and off. Such all-optical switching between two steady states is ca...

Localized oscillating fields are beam splitters that can entangle internal and longitudinal momentum states in an atomic beam. Differentially detuned separated oscillatory fields and an am modulator constitute a “white fringe” longitudinal interferometer which rephases velocity averaging by a process analogous to half a spin echo. Differentially detuned separated oscillatory fields are used to ...

Conditions required for in sirn growth of YBaCuO thin films by reactive electron-beam evaporation have been explored Three sources of activated oxygen (atomic oxygen from microwave discharge, a plasma generated by electron beams, and an ion beam ) were compared. The best results so far were obtained with atomic oxygen. Epitaxial films with high critics currents were grown -on SrTiO3 and <...

A novel polarization technique has been successfully implemented for the upgrade of the RHIC polarized H ion source to higher intensity and polarization. In this technique, a proton beam inside the high magnetic field solenoid is produced by ionization of the atomic hydrogen beam (from an external source) in the He-gas ionizer cell. Proton polarization is produced by the process of polarized el...

We describe a simple experiment that demonstrates one-dimensional laser cooling in a sealed vapor cell. A velocity selective optical pumping scheme was first used to define a collimated beam of atoms within the cell. A particular velocity group of atoms was labeled by optical pumping with one laser and detected by absorption with a second laser. Transverse cooling of this velocity group, which ...