| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Solid-state Optical Materials and Luminescence Properties
|
| Presentation Title |
Advanced Spinel Ceramics with Highest VUV-vis Transparency |
| Author(s) |
Akio Ikesue |
| On-Site Speaker (Planned) |
Akio Ikesue |
| Abstract Scope |
Synthesis of optical grade spinel ceramics superior to commercially available single crystal
spinel was successfully achieved through reactive sintering between high purity MgO and Al2O3 powders with a small amount of MgF2 and AlF3 as sintering aids. The average grain size of the fabricated spinel ceramics was approximately 20μm, with residual porosity at the 10-13 level. The transmission characteristics from the visible to infrared region of the spinel ceramics (optical loss: <0.1%/cm) are equal to or higher than those of the single crystal spinel produced by the Czochralski method. Since the optical homogeneity of the ceramics is extremely high, the beam quality of the laser transmitted through the material did not degrade. The optical band gaps of spinel ceramics and single crystals are 6.81eV and 5.51eV respectively. However, polycrystalline ceramics showed excellent characteristics especially in the vacuum ultraviolet wavelengths below 200 nm where single crystals are difficult to transmit. |