MEASURED PULSE VELOCITY GREATER THAN c IN A NEON ABSORPTION CELL
- 1 September 1970
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 17 (5) , 192-193
- https://doi.org/10.1063/1.1653360
Abstract
The pulse velocity in a Ne absorption cell placed inside a self‐locked He–Ne (6328 Å) laser has been found to exceed c, the free‐space velocity of light, by about 3 parts in 104. Conversely, the pulse velocity in a He–Ne gain cell was less than c by about the same fraction. These results are consistent with the classical group velocity dω/dk, where the frequencies are confined to the central region of the resonant line.Keywords
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