Techniques for using chirped fields to reconfigure a medium that stores spectral features
US7307781B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2006 |
| Grant date | Dec 11, 2007 |
| Priority date | — |
| Expiry date | Jul 14, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C13/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Techniques for reconfiguring spectral features stored in a medium based on a two-state atomic system with transition dipole moment μ includes causing a chirp to pass into the medium. The chirp includes a monochromatic frequency that varies in time by a chirp rate κ over a frequency band BR during a time interval TR. The amplitude AR of the chirp is constant over BR and equal toAR=(hbar/μπ)√{square root over ((κ ln [2/ε]))},The term hbar is reduced Plank's constant, ln is a natural logarithm function, and π is a ratio of a circumference of a circle to a diameter of the circle. For ε<<1, the atomic-state populations in the two states are inverted. For ε=1, prior atomic-state populations are erased, with final populations equal in the two states, regardless of populations before erasure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.