Concentration dependence of energy transfer between chromium (III) and neodymium (III) in lithium-lanthanum-phosphate glasses

✍ Scribed by R. Reisfeld; A. Kisilev

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 499 KB
• Volume: 115
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(85)85170-8

✦ Synopsis

Energy-transfer efficiencies between C?+ and Nd3+ various concentrations of Cr3+ and Nd'+. were measured in lithium-lanthanum-phosphate glasses doped by The transfer efficiencies obtained by decrease of donor lifetimes revealed different bekvior from those calculated directly from the increase of Nd3+ Iuminescence. Optimum conditions are determined for lumineseenee devices based on these materials. 1. Intmduction Lithium-lanthanum-phosphate glasses doped by Nd3+ were reported to have reasonable cross section for laser emission [l] _ Later it was suggested that Nd laser can be pumped via Cr3+ in Nd(Al,Cr)3(PO& crystals [Z] and several silicate glasses [3]. It was also shown that efficient energy transfer takes place between Cr3+ and Nd3+m LLJ? glass [4] _ However, the lifetime of Cr3* from which the transfer rates can be determined was not measured because ofthe low intensity ofCr3+ lmnlnescence. It was also indicated that in LLP glass with high Nd concentration the interaction between Cr3+ and Nd3* is more effective than the non-radiative losses in Cr3+. It was also realized that high Nd concentrations are accompanied by back energy transfer from Nd3+ to Cr3+ [5]. Wirig et al. [6] have observed cw laslng in LLP glasses doped by Cr3* and Nd3+ and cormluded that the presence of Cr3+'does not lower significantly the slope efficiency of Nd3+ as compared to Nd3+ only doped glasses. These authors concluded that presence of C!r3* can extend-the pumping range of the lasers. In order to evaluate the advantages and disadvantages of co-doping Nd3* with Cr3* for glass lasers and ' EnriqueBerman Professor of Solar Energy.