| Patent Number |
Title Of Patent |
Date Issued |
| 7378913 |
Optically excited atomic frequency standard |
May 27, 2008 |
| An optically-excited atomic frequency standard that subjects alkali metal atoms (111) to circularly-polarized optical radiation. The atomic frequency standard is improved by the use of a circular polarizer (202) to control the intensity of the circularly-polarized optical radiation. |
| 7003438 |
Apparatus for correcting for the effects of laser noise |
February 21, 2006 |
| Adaptive noise reduction techniques used in devices that pass light from a laser through a quantum medium such as a rubidium vapor cell. A CPT frequency standard that employs the techniques has a first channel in which the laser light passes through the quantum medium and to a photod |
| 6320472 |
Atomic frequency standard |
November 20, 2001 |
| An atomic frequency standard based on the ground state hyperfine resonance line observed by means of coherent radiation fields creating Coherent Population Trapping (CPT) in an alkali metal atomic ensemble contained in a cell. The radiation fields are created by frequency modulating a la |
| 6265945 |
Atomic frequency standard based upon coherent population trapping |
July 24, 2001 |
| An atomic frequency standard is disclosed where optical pumping of the resonance cell is achieved by coherent light and the pumping results in Coherent Population Trapping of the resonant alkali metal atoms. The fabrication of frequency standards of substantially reduced size and wei |
| 6255647 |
Atomic frequency standard based on coherent state preparation |
July 3, 2001 |
| An atomic frequency standard based on coherent microwave emission from an ensemble of hydrogen or alkali metal atoms at their ground state hyperfine frequency. Hydrogen or alkali metal atoms are prepared in a coherent state by means of a radiation field resonant with the atoms at their h |
| 6222424 |
Optically pumped atomic frequency standard |
April 24, 2001 |
| An improved optically pumped atomic frequency standard in which excitation light intensity entering the resonance cell is controlled and maintained independently of the optical pump. |
| 6215366 |
Metallic cell for optically activated atomic frequency standards |
April 10, 2001 |
| The invention disclosed herein is a cell construction for use in optically activated atomic frequency standards. The cell includes a stiff non-magnetic metallic chamber body having an integral cold weldable tubulation through which the atomic source material may be charged and the tu |
| 4460317 |
Ion pump |
July 17, 1984 |
| An ion pump is described which includes a vacuum housing, a unique, readily removable and replaceable magnet system which makes it possible to measure leakage current alone and a unique, readily removable and replaceable reactive metal cathode for reacting with gaseous ions impinging the |
