Volume 33, Number 7, March I 1996
|Page(s)||515 - 520|
|Section||Classical areas of phenomenology|
|Published online||01 September 2002|
Pump operator for lasers with multi-level excitation
Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts
2 Department of Physics, Texas A&M University, College Station - Texas 77843, USA
3 Max-Planck-Institut für Quantenoptik - Hans-Kopfermann-Str. 1, D-85748 Garching, Germany
4 Sektion Physik, Ludwig-Maximilians-Universität - München, Germany
5 Laboratoire de Physique des Lasers (Unité de recherche associée au CNRS (URA 282).) , Institut Galilée, Université Paris-Nord Av. J. B. Clément, F-93430 Villetaneuse, France
Accepted: 17 January 1996
In a multi-level laser the pump process involves several intermediate levels. The details of the atomic excitation are often irrelevant so that an effective heat bath description and a two-level–laser model are applicable. The heat bath approximation may be too crude, however; it does not predict phenomena such as intensity-noise squeezing and sub-Poissonian field statistics. We show how, in the general situation, the multi-level description can still be reduced to a two-level description in terms of a non-Markovian master equation where a rate matrix, rather than a single rate, accounts for the excitation process. The resulting dependence of the excitation rates on the state of the laser field constitutes a correction to the standard laser model. We hold it responsible for the dynamic noise reduction in multi-level lasers.
PACS: 42.50.-p – Quantum optics / 42.55.-f – Lasers / 32.80.-t – Photon interactions with atoms
© EDP Sciences, 1996
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.