Abstract

Direct measurements of the gain/loss spectra for the principal transition of the erbium ion (1.5μm) in ytterbium-erbium phosphate glasses as a function of the concentration of ytterbium ions and the laser pump power have been carried out. The ytterbium concentration was varied from zero to the limiting value of 52.4×10²⁰cm⁻³. It is shown that increasing the ytterbium concentration, beginning with N_Yb=20.9×10²⁰cm⁻³, results in a reduction of the gain threshold. On glass with the limiting ytterbium concentration (ytterbium metaphosphate), population inversion is achieved at low pump powers of 35mW. The largest gain of 0.1cm⁻¹ is obtained on a sample 0.5mm thick with ytterbium concentration 41.7×10²⁰cm⁻³ and erbium concentration 0.29×10²⁰cm⁻³ with an absorbed pump power of 210mW.

© 2008 Optical Society of America

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