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Titolo:
LASERS WITHOUT PHOTONS - OR SHOULD IT BE LASERS WITH TOO MANY PHOTONS
Autore:
SIEGMAN AE;
Indirizzi:
STANFORD UNIV,DEPT ELECT ENGN,EDWARD L GINZTON LAB STANFORD CA 94305
Titolo Testata:
Applied physics. B, Lasers and optics
fascicolo: 2-3, volume: 60, anno: 1995,
pagine: 247 - 257
SICI:
0946-2171(1995)60:2-3<247:LWP-OS>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPONTANEOUS-EMISSION FACTOR; EXCESS SPONTANEOUS-EMISSION; QUANTUM-MECHANICAL EXPLANATION; SEMICONDUCTOR DIODE-LASERS; BEAM-POINTING FLUCTUATIONS; HERMITIAN OPTICAL-SYSTEMS; GAIN-GUIDED AMPLIFIERS; PETERMANN K-FACTOR; X-RAY LASERS; LONGITUDINAL EIGENMODES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
A.E. Siegman, "LASERS WITHOUT PHOTONS - OR SHOULD IT BE LASERS WITH TOO MANY PHOTONS", Applied physics. B, Lasers and optics, 60(2-3), 1995, pp. 247-257

Abstract

Expanding the fields of a laser cavity in a set of orthonormal modes is a standard technique in laser theory. Expansion in a normal mode set is also the basis of the concept of ''photons''. A substantial number of practical lasers do not, however, support any kind of normal or orthogonal cavity modes, and thus, their fields cannot be represented (at least not easily) in terms of normal modes, or photons. This leads to a number of unusual results, including situations in which the fewest-order made of a cavity can contain substantially more energy than the total energy in the cavity, as well as enhanced quantum spontaneousemission far stronger than the ''single extra photon'' level characteristic of an ordinary laser oscillator. We review the theoretical origins of these unusual effects and present experimental confirmation of greatly enhanced Schawlow-Townes fluctuations in an unstable-resonatorlaser with a Petermann-noise enhancement factor of several hundred times.

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Documento generato il 07/07/20 alle ore 12:25:26