Ca-La-F BASED TRANSPARENT CERAMIC, Ca-La-F BASED TRANSPARENT CERAMIC, OPTICAL ELEMENT, OPTICAL SYSTEM, AND CERAMIC-FORMING COMPOSITION
AssigneeNikon Corporation
InventorHitoshi ISHIZAWA
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Abstract
A Ca—La—F based transparent ceramic, including: mixing CaF2 particles and LaF3 particles that are prepared separately from the CaF2 particles to form a mixed body of particles, and sintering the mixed body of particles and making the mixed body transparent, thereby producing a transparent ceramic.
Claims5
A transparent ceramic that is constituted of a polycrystalline body including crystals of (Ca1−xLax)F2+x, where x denotes a number larger than 0 and not larger than 0.4, and has a transparency capable of transmitting light, wherein transmittance of light of 550 nm in wavelength is not lower than 50% and the transparent ceramic has a thickness of 2 mm.
Dependencies are inferred from the claim text.