Effect of Powder Calcination Temperature and Ceramic Post‐Treatment on the Optical Properties of N d: YAG Ceramics

Using the raw powders synthesized via a modified coprecipitation method with the ethanol–water precipitant solvent and combined with various powder calcination temperatures, the ceramics were fabricated by dry pressing, vacuum sintering, and air annealing. The results showed that higher powder calcination temperature could promote powder crystallinity and green‐compact density, and the corresponding ceramic transmittance increased. Meanwhile, more micrometer‐sized pores emerged in final ceramic. Fortunately, these large‐sized pores did not cut the ceramic transmittance sharply. To eliminate these pores, all ceramics were post‐treated with hot isostatic pressing and re‐annealing. All post‐treated ceramics showed increasing transmittances.