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Soviet Journal of Quantum Electronics

Influence of the "hole burning" effect on the optical bistability in lasers containing a saturable absorber

Dinh Van Hoang, Vo Thanh Lam

Published Apr 30, 1989• 0 citations
Publisher

Abstract

An analysis is made of the influence of the "hole burning" effect on the optical bistability during operation of lasers containing a saturable absorber in the resonator. The rate equation approximation is used to examine single-mode and multimode lasing. The results obtained show that under certain conditions not only the bistability, but also multistable states can appear.

DOI
10.1070/qe1989v019n04abeh007891

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An analysis is made of the influence of the "hole burning" effect on the optical bistability during operation of lasers containing a saturable absorber in the resonator. The rate equation approximation is used to examine single-mode and multimode lasing. The results obtained show that under certain conditions not only the bistability, but also multistable states can appear.
The characteristics of the mode intensity and conditions for occurrence of optical bistability in a ring laser with a saturable absorber are considered. The rate equation approximation method is used to find analytic expressions for these characteristics. It is shown that changes in such physical parameters as the homogeneous and inhomogeneous broadening, coefficients of relaxation of amplifying and absorbing cells, etc. cause changes in the range of existence of optical bistability or a hysteresis cycle. The influence of inhomogeneous broadening and of spontaneous emission near the lasing threshold on the appearance of optical bistability is demonstrated for the single-mode regime.
The optical bistability (OB) behavior of single-mode Fabry- Perot lasers containing saturable absorber (LSA) is presented on the basis of the rate equations with allowance for spontaneous emission and spatial hole-burning. Special attention is paid to the case of dominant inhomogeneous broadening in both Lorentzian and Gaussian models. The OB occurrence conditions are clearly displayed in phase diagrams. The influence of the main LSA parameters on OB characteristics as well as on OB curves' stability are investigated in detail. Some practical suggestions for optimizing the bistable operation in LSA are also given.
Our work concerns the study of the effect of the optical bistability and multistability in a laser saturable absorber of a Fabry Perot resonator with a homogenous widening. We theoretically studied the influence of the losses of the resonators on the optical bistability by examining mainly the cases where the losses of the resonator depend on the position of the emitted mode of a frequency and the losses of the resonator depend on the density of photons We examined the influence of the physical parameters of laser saturable absorber such as the coefficient of saturation and pumping of the medium active and absorbing on the density of the photons for each loss We showed the effect of the optical bistability and multistability then we analyzed the linear stability of the solutions obtained.