The analysis of the threshold of concentration of damage-resistant ions by OH<sup>-</sup> absorption spectra

Qingxin Meng; Suhua Luo; Xiudong Sun

doi:10.1117/12.574413

28 January 2005 The analysis of the threshold of concentration of damage-resistant ions by OH^- absorption spectra

Qingxin Meng, Suhua Luo, Xiudong Sun

Proceedings Volume 5646, Nonlinear Optical Phenomena and Applications; (2005) https://doi.org/10.1117/12.574413
Event: Photonics Asia, 2004, Beijing, China

Abstract

The infrared spectra of congruent LiNbO₃:Fe:M (M= Mg²⁺, Zn²⁺, In³⁺, [Li]/[Nb]=0.946) crystals with 0.03wt% Fe₂O₃ were measured by a FT-IR spectrometer from 3400cm^-1 to 3580cm^-1. The spectra show that OH^- absorption band of double-doped LiNbO₃:Fe:M crystal locates at about 3482 cm^-1 as that of single-doped LiNbO₃:Fe crystals, and it is not shifted to ultraviolet band until the concentrations of M exceeds its concentration threshold. The threshold of damage-resistant ions M is 6mol% Zn²⁺, 4mol% Mg²⁺ and 3mol% In³⁺, respectively. The OH^- absorption band of M-doped (>concentration threshold) LiNbO₃:Fe crystals shifted to 3535, 3525 and 3508 cm^-1, which results from the OH^- stretching vibration in [M_Nb]^a--OH^--[M_Li]^b+ complexes. The influence of valence on the concentrate threshold is also discussed.

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Qingxin Meng, Suhua Luo, and Xiudong Sun "The analysis of the threshold of concentration of damage-resistant ions by OH^- absorption spectra", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); https://doi.org/10.1117/12.574413

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