The optical damage resistance and absorption spectra of LiNbO3:Hf crystals

Highly HfO 2 doped lithium niobate crystals have been grown. The experimental results indicate that LiNbO 3 :Hf (up to 4 mol%) can withstand the same light intensity, of 5 × 10 5 W cm −2 , as LiNbO 3 :Mg (6.5 mol%). And the OH − absorption bands of these LiNbO 3 :Hf crystals shift to 3487 cm −1 from the 3484 cm −1 for congruent pure LiNbO 3 . The difference spectra and fitting treatments show that the OH − absorption peak corresponding to (Hf Nb 4+ ) − –OH − is located at 3500 cm −1 .