• S S RESHMA

      Articles written in Bulletin of Materials Science

    • Investigations on vacuum sintered ytterbium-doped YAG ceramic: a laser–host material

      GURVINDERJIT SINGH S S RESHMA RACHNA SELVAMANI V S TIWARI A K KARNAL

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      Laser–host ceramics are a new class of materials and have proved to be a good alternative to the single-crystals. They can be produced in large size with higher concentration of activator ions having more homogeneity which is difficultto achieve with the conventional single-crystal growth technology. Ytterbium (Yb)-doped yttrium aluminium garnet (YAG) is a very attractive laser–host material because of its broad emission band, low quantum defect, no excited state absorption or up-conversion loss and wide range of tunability. In the present work, 10 atm% Yb-doped YAG transparent ceramic was fabricated using nano-powder technology and vacuum sintering. Single-phase nano-powders of Yb:YAG were synthesized by a co-precipitation method and thereafter sintered under vacuum at 1750$^{\circ}$C for 5 h. The as-sintered ceramic samples are ofdark greenish colour which is attributed to the reduction of Yb$^{3+}$ to Yb$^{2+}$ during vacuum sintering. However, after annealing in air at 1350$^{\circ}$C for 8 h they retain their natural colour attributed to the transformations from Yb$^{2+}$ to Yb$^{3+}$. The transmission spectra of the as-sintered polished ceramics show the presence of broad absorption bands near 250, 380, 480 and 630 nm due to the electronic transitions in the Yb$^{2+}$ ion. These bands disappear after annealing in air. The well-established bandsdue to transitions in Yb3+ were observed between 900 and 1000 nm.

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