Abstract
The Nd:YAG nanopowders were synthesized at 800–1300°C via a modified co-precipitation method. Nd:YAG transparent ceramics were fabricated by vacuum sintering at 1770–1790°C for 20h with heating rates 1–10°C/min. The effects of calcining temperatures of highly sinterable Nd:YAG nanopowders, sintering temperature and heating rate on microstructure and transmittance of Nd:YAG ceramics have been investigated. After calcination at 1250°C for 4h, Nd:YAG nanopowders with primary particle size of about 106nm and low agglomeration were obtained. Using as prepared powders, high optical quality Nd:YAG ceramics prepared at 1780°C with dwell time of 20h and heating rate at 1°C/min have been obtained and shows the in-line transmittance reached 83.9% (1064nm). With 17.6W of maximum absorbed pump power, laser output of 4.5W has been obtained with an oscillation threshold and a slope efficiency of 0.5W and 25.6%.
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