Gain spectra in ytterbium-erbium metaphosphate glasses for microlasers

Асеев В.А., Златов А.С., Никоноров Н.В., Пржевуский А.К., Федоров Ю.К. Спектры усиления в иттербий-эрбиевых метафосфатных стеклах для микролазеров // Оптический журнал. 2008. Т. 75. № 3. С. 79–82.

Aseev V.A., Zlatov A.S., Nikonorov N.V., Przhevuskiy A.K., Fedorov Yu.K. Gain spectra in ytterbium-erbium metaphosphate glasses for microlasers [in Russian] // Opticheskii Zhurnal. 2008. V. 75. № 3. P. 79–82. 

V. A. Aseev, A. S. Zlatov, N. V. Nikonorov, A. K. Przhevuskiĭ, and Yu. K. Fedorov, "Gain spectra in ytterbium-erbium metaphosphate glasses for microlasers," Journal of Optical Technology. 75 (3), 203-205 (2008). https://doi.org/10.1364/JOT.75.000203

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 52,4х10²⁰см^-3. It is shown that increasing the ytterbium concentration, beginning with N_Yb = 20,9х10²⁰ см^-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 0,1 см^-1 is obtained on a sample 0.5mm thick with ytterbium concentration 41,7х 10²⁰ см^-3 and erbium concentration 0,29х 10²⁰ см^-3 with an absorbed pump power of 210mW.