Efficient 2.0 μm emission in Nd3+/Ho3+ co-doped SiO2-Al2O3-Na2CO3-SrF2-CaF2 glasses for mid-infrared laser applications. (July 2018)

• Record Type: Journal Article
• Authors: Gelija, Devarajulu; Borelli, Deva Prasad Raju
• Is Part Of: Materials research bulletin. Volume 103(2018)
• Page Start: 268
• Page End: 278
• Publication Date: 2018-07
• Subjects: Nd3+/Ho3+-co-doped glasses -- Infrared spectroscopy -- Mc-Cumber theory -- Energy transfer -- Lifetime; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2018.02.052
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: The Ho 3+ and Nd 3+ /Ho 3+ co-doped glasses were prepared by melt quenching method. Nd 3+ ions act as a good sensitizer for getting intense emission around at ∼2.0 μm. The (σ M emi ) emission cross-section has been found to be 3.85 × 10 −21 cm 2 . The energy transfer efficiency has been reached 50% from Nd 3+ to Ho 3+ ions. The present glasses could be potential medium for ∼2.0 μm mid-infrared applications. Abstract: Nd 3+ /Ho 3+ co-doped SiO2 -Al2 O3 -Na2 CO3 -SrF2 -CaF2 -Ho2 O3 -Nd2 O3 oxyfluorosilicate glasses have been prepared by high temperature melt-quenching method. The co-doped samples exhibit fluorescence bands centered at 892, 1058, 1330 nm and 2.0 μm under the excitation of 808 nm laser diode (LD). The energy transfer mechanism between Nd 3+ and Ho 3+ was analyzed based on the absorption, emission and the energy level structures of Nd 3+ and Ho 3+ ions. In the present investigation, the energy transfer efficiency from Nd 3+ to Ho 3+ reached ∼50% under the excitation of 808 nm. This result indicates that Nd 3+ ions can be potentially used as sensitizers for Ho 3+ ions to stimulate the NIR emissions. Stimulated emission cross-section was evaluated for the prominent 5 I7 → 5 I8 transition of Ho 3+ ion by using the Mc-Cumber theory. The spectroscopic characteristics of Nd 3+ /Ho 3+ co-doped oxyfluorosilicate glasses are found to be suitable as optical medium for mid infrared emission at ∼2.0 μm.