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Light beam of weak power (30-300 mW) was deflected (about 5°) passing through the crystal. The beam fans out in the plane determined by the beam direction and c-axis of the crystal. The beam fanning disappeared above 500°C.
B. G. Pantchev
"Direct measurement of refractive index profile of gradient planar optical waveguides", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1983CE (23 July 1993); https://doi.org/10.1117/12.2308865
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B. G. Pantchev, "Direct measurement of refractive index profile of gradient planar optical waveguides," Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1983CE (23 July 1993); https://doi.org/10.1117/12.2308865