Energy Levels on Hexagonal Erbium-Tribromide

Louis C. Marquet, W. E. Behring

T. M. Kozhan, В. В. Кузнецова, И. И. Сергеев +1 more

Karl Friedrich Renk

In this paper, I will show that excited-impurity quasiparticles may play an essential role for the amplification of radiation in an erbium-doped glass fiber amplifier. A quasiparticle consists of an excited state of an erbium ion interacting with other erbium ions and with the thermal bath via phonon-assisted energy transfer processes. The quasiparticles populate energy levels of a quasiband. Fermi’s statistics determines the average occupation numbers of the levels. The quasiparticle model leads to an analytical expression for the gain coefficient of an erbium-doped glass fiber amplifier, or generally, of a fiber amplifier or fiber laser.

E. Desurvire, J. R. Simpson

Spectroscopic measurements of fluorescence and absorption in an erbium-doped fiber permit the evaluation of the Stark-level energies of the (4)I(15/2) and (4)I(13/2) manifolds in Er:glass. The data permit the allocation of the individual laser transitions associated with the room-temperature gain spectrum of erbium-doped fiber amplifiers operating near lambda = 1.53 microm.

Kiyoshi Murakawa, Shigeki Suwa

Franciszek K. Kaczmarek, Henrik Malak

Lifetime of the main fluorescence level, 4S3 '2 , of erbium pentaphosphate monocrystal was measured to be 380f20 ns.Direct excitation to higher energy levels, and also indirect excitation with the use of an infrared beam were applied.