Issue |
Europhys. Lett.
Volume 33, Number 7, March I 1996
|
|
---|---|---|
Page(s) | 515 - 520 | |
Section | Classical areas of phenomenology | |
DOI | https://doi.org/10.1209/epl/i1996-00371-6 | |
Published online | 01 September 2002 |
Pump operator for lasers with multi-level excitation
1
Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts
02138, USA
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
Received:
9
October
1995
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
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