Enhancement of 1.53 μm emission in erbium/cerium-doped germanosilicate glass pumped by common 808 nm laser diode

摘要

Erbium-doped germanosilicate glasses with various cerium ions contents have been prepared. Optical absorption and 1.53 μm emission spectra were measured to characterize the spectroscopic performances of prepared samples. A detailed study of 1.53 μm spectroscopic properties was carried out when pumped by an 808 nm laser diode. Moreover, an energy level diagram and an energy transfer mechanism between Er~(3+) and Ce~(3+) were proposed to elucidate the enhanced 1.53 μm fluorescence. It is found that the prepared samples have optimal spectroscopic properties when the Ce~(3+) concentration is fixed to 0.5 mol. %. High spontaneous radiative transition probability (172.66 s~(-1)), large effective emission bandwidth (74 nm), and emission cross section (9.49 × 10~(-21) cm~2 indicate that 808 nm pumped Er~(3+)/Ce~(3+) codoped germanosilicate glass might be a suitable material for a broadband optical amplifier.