Er3+ concentration study in green up-conversion of ZBLAN: Er3+ glasses pumped with LD 970 nm laser

摘要

Abstract: Five samples of ZBLAN:Er$+3$PLU$/ (Er$+3$PLU$/ concentration: 500 ppm, 5000 ppm, 1 mol%, 1.5 mol%, 3 mol%) were fabricated and their optical and thermal parameters were analyzed. The up-conversion processes of the green, red and blue emission bands were investigated under 970 nm pump. The green at 525 - 545 nm and red at 654 - 665 nm radiation transitions are due to two photons absorption; and the blue generation is maybe responsible for the single excited state absorption at 545 nm from the $+4$/I$-13/2$/ level. In our experiment, the 1.5 mol Er$+3$PLU$/% in ZBLAN:Er glass sample is the optimum doping-concentration that generates green emission under 970 nm LD pump, because its luminescence intensity almost is quasi-linear with working current in 10 mA range from 230 to 240 mA in comparison with other samples.!3