Gradient-Index (GRIN) Lenses by Slurry-Based Three-Dimensional Printing (S-3DP)
Final rept. 1 Apr 2000-30 Sep 2003
MASSACHUSETTS INST OF TECH CAMBRIDGE
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The BaO-SiO2 material system, which has a 2.4 stronger index changing ability than the Al2O3-SiO2 material system, was developed. Barium acetate was used as the dopant source. The pre-sintering treatment was found to be 900 degrees C for 18 hours in air to convert barium acetate to barium oxide. The sintering condition was found to be 1725 degrees C for 10 minutes in vacuum. A barium oxide-doped GRIN lens with radial parabolic index variation was fabricated. Its effective focal length was measured to be 14.63cm in the x direction and 11.14cm in the y direction. The barium oxide concentration profiles were measured. The theoretical focal lengths were calculated and compared with the effective focal lengths.
- Fabrication Metallurgy
- Inorganic Chemistry