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Soviet Journal of Quantum Electronics

Simultaneous influence of quantum fluctuations of the intensity and of spatial inhomogeneities on the emission dynamics of wide-band lasers and on the sensitivity of intracavity spectroscopy

Sergey A. Kovalenko, S P Semin

Published Jan 31, 1989• 0 citations
Publisher

Abstract

Simultaneous influence of quantum fluctuations of the intensity and of spatial inhomogeneities on the emission dynamics of wide-band lasers and on the sensitivity of intracavity spectroscopy, S A Kovalenko, S P Semin
DOI
10.1070/qe1989v019n01abeh007725

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I. V. F. Gamaliĭ, E. A. Sviridenkov, and D. D. Toptygin Stimulated emission spectrum of a laser with narrow-band intracavity absorption and temporal modulation of the gain [Sov. J. Quantum Electron. 18, 1541–1547 (December 1988)] II. S. A. Kovalenko and S. P. Semin Simultaneous influence of quantum fluctuations of the intensity and of spatial homogeneities on the emission dynamics of wide-band lasers and the sensitivity of intracavity spectroscopy [Sov. J. Quantum Electron. 19, 101–102 (January 1989)]
A model using rate equations which allow for quantum noise is used to make a theoretical analysis of the steady-state lasing regime of a cw dye laser. Equations describing the laser performance are derived in the adiabatic approximation neglecting spatial inhomogeneities in the burnup of the active medium. An investigation is made of the stability of steady-state multimode laser action and it is found that this is weak in certain modes. Calculations are made of correlation functions describing fluctuations in the numbers of photons in the modes and fluctuations in the total intensity. Although the fluctuations in individual modes are large, the integrated intensity fluctuates negligibly. An analysis is made of the influence of quantum intensity fluctuations on the attainment of maximum sensitivity in intracavity laser spectroscopy.
In their review about intracavity laser spectroscopy, P. E. Toschek and V. Baev [in Laser Spectroscopy and New Ideas, edited by W. M. Yen and M. D. Levenson, Springer Series in Optical Science (Springer, Berlin, 1987)] have shown that multimode lasers are needed to obtain a high sensitivity. In this paper we show that two modes is enough. We discuss first the ideal case where only the spontaneous emission limits the sensitivity. In a second part we take into account the spatial hole burning, which couples the two modes and has for effect a lower limitation of the sensitivity. Analytical expressions are given for the modified absorption coefficient and the time evolution of the intensity of the two modes is calculated by numerical integration.