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Steady-State and Switch-Off Behavior of Upconversion in Er-Doped Fibers

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Khoptyar D., Jaskorzynska B.

Acta Physica Polonica A

2003

vol. 103

issue 2-3

207-210

By measuring the metastable and the upconverted fluorescence in Er-doped fibers we determine rate of homogeneous upconversion as a function of the population inversion. The results confirm the prediction of our statistical model that at the same population inversion the upconversion rates under the steady-state and the switch-off conditions are different. The larger rate of the steady state upconversion is attributed to the pump enhanced redistribution of the excitation energy.

Nonlinear Upconversion-Rate in Er-Doped Fibers

81%

Jaskorzyńska B., Sergeyev S., Świłło M., Khoptyar D.

Acta Physica Polonica A

2001

vol. 99

issue 1

147-154

Energy transfer between excited rare-earth ions has been widely used for realizing upconversion lasers and also recognized as a gain limiting factor in high-concentration Er-doped amplifiers. The energy transfer leads to upconversion of the excitation which for randomly distributed (not clustered) ions is called homogeneous upconversion. It was commonly assumed that the rate of homogeneous upconversion is a linear function of the population inversion N_2. However, recently published Monte Carlo simulations predict that the homogeneous upconversion rate is a nonlinear function of N_2 and that it, moreover, depends on the pump and signals rates. In this paper we review some of our experimental results confirming those predictions. We also propose a statistical, analytical model describing the observed homogeneous upconversion behavior in Er-doped fibers.

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2 Acta Physica Polonica A

1 2003

1 2001

2 Khoptyar D.

1 Jaskorzynska B.

1 Jaskorzyńska B.

1 Sergeyev S.

1 Świłło M.

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Steady-State and Switch-Off Behavior of Upconversion in Er-Doped Fibers

Nonlinear Upconversion-Rate in Er-Doped Fibers