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Soviet Journal of Quantum Electronics

Comments on two papers inKvantovaya Elektronika

A F Suchkov

Published Oct 31, 1991• 0 citations
Publisher

Abstract

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)]

DOI
10.1070/qe1991v021n10abeh004336

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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)]
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.
To test the application of solid-state lasers to intracavity laser absorption spectroscopy (ICLAS), we studied a neodymium-doped glass laser, in the presence of extreme relaxation oscillations (up to 108{10}^{8}108 intensity contrast). The contrast of these oscillations could be varied by changing the Q-switch transition time. The recorded absorption spectra accurately follow the regular ICLAS behavior except when the intensity in the first relaxation oscillation minimum becomes too low. In such a case, we find that the ICLAS absorption spectrum accumulated during the first spike is ``forgotten'' by the system. Numerical simulations were done which accurately describe the observed transition to a regime of memory loss, when the number of photons circulating in each mode drops close to 1. These simulations show that the mechanism of memory loss is the prevailing of spontaneous over stimulated emission. This effect sets the fundamental limit of the sensitivity of an ICLAS spectrometer where the nonlinear mode interactions are negligible. This effect was observed before only in a diode laser system with high internal losses. In this paper we report an observation of ICLAS sensitivity saturation by spontaneous emission during relaxation oscillations in a laser with low cavity losses. \textcopyright{} 1996 The American Physical Society.