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Processing of Ceramics


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target="_blank" rel="nofollow" href="#ulink_8b119514-cf24-5f91-a59b-fdf4f68d9ca5">Figure 2.21 (a) X‐ray diffraction pattern of FAP powder as a raw material for Yb:FAP ceramics and Yb:FAP ceramics. Diffraction from Yb:FAP ceramics were from the surface of 3 mm × 3 mm. (b) Transmission and absorption spectra of Yb:FAP ceramics.

      Source: Sato et al. [20]© 2014, The Optical Society.

Schematic illustration of (a) experimental configuration of the confirming of laser grade quality. (b) Slope efficiency of Nd:YVO4 laser as a function of output coupling. 2 at.% Yb:FAP ceramics with the thickness of 0.6 mm was placed in the resonator.

      Source: Sato et al. [20]© 2014, The Optical Society.

Schematic illustration of optical scattering in fine-grained non-cubic ceramics.

      Source: Furuse et al. [22]. Licensed under CC BY 4.0.

Schematic illustration of transmitted spectrum and loss coefficient of Nd:FAP ceramics. The dashed line is the theoretical transmittance, and the red dotted lines are calculated ones. The inset shows a 1-mm thick Nd:FAP ceramic sample after polishing.

      Source: Furuse et al. [22] Licensed under CC BY 4.0.

Schematic illustration of effect of CAPAD temperature on the relative density of undoped and samples doped with 0.25 and 0.35 at.% Nd. The inset is a picture demonstrating long-range transparency.

      Source: Penilla et al. [23]. Licensed under CC BY 4.0.

      It is the most effective method to produce a laser gain medium having an anisotropic structure in a polycrystalline form. However, no effective idea for reducing the optical loss to the level of a single crystal has been proposed. As one solution to solve this problem, the synthesis of single crystal by the sintering method will be described in Chapter 7.

      The development of polycrystalline ceramics having optical anisotropy has not been shown theoretically or technically to have innovative results. Instead of challenging technical issues that cannot be theoretically overcome, the authors chose an unprecedented material synthesis with a new method. In recent years, the author has succeeded in synthesizing bulk single crystals by chemical transport, which sublimates polycrystals and synthesizes them at low temperature [24].

Image described by caption.

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