关键词: La2 Ti2 O7;坩埚下降法;晶体生长;光学性能

Abstract: La2Ti2O7 crystal has been grown by a high-temperature vertical Bridgman method. The as-grown crystal is about 18 mm x 12 mm x 10 mm in dimensions with a series of (004) cleavage planes on the surface. X-ray rocking curve reveals that the crystal has excellent crystalline quality. Transmission spectra implies the nnealed La2Ti2O7 crystal is transparent in visible region and drops down quickly near 800 nm. The optical absorption edge is around 500 nm. Refractive index analysis emonstrates the annealed La2Ti2O7 crystal has high refractive property. The dispersion relation is determined to be n2 ( A ) = 4. 61643 +0. 16198/ (A2_0.01547) - 0. 4720IA2 which can be used to calculate the refractive indexn value at any wavelength in the range of 300-1680 nm.

Key words: La2Ti2O7 crystal has been grown by a high-temperature vertical Bridgman method. The as-grown crystal is about 18 mm x 12 mm x 10 mm in dimensions with a series of (004) cleavage planes on the surface. X-ray rocking curve reveals that the crystal has excellent crystalline quality. Transmission spectra implies the nnealed La2Ti2O7 crystal is transparent in visible region and drops down quickly near 800 nm. The optical absorption edge is around 500 nm. Refractive index analysis emonstrates the annealed La2Ti2O7 crystal has high refractive property. The dispersion relation is determined to be n2 ( A ) = 4. 61643 +0. 16198/ (A2_0.01547) - 0. 4720IA2 which can be used to calculate the refractive indexn value at any wavelength in the range of 300-1680 nm.