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absorption spectra of LN crystals codoped with Fe and different concentrations of Zr. The curves from top to bottom are for 1, 2, 3, 4, and Zr, respectively.
Transmittance curves for LN crystals codoped with 0.03% and different concentrations of . A, B, C, D, and E are for 1, 2, 3, 4, and Zr, and X and Y are for 2 and Hf, respectively.
Photorefractive properties of LN:Fe,Zr crystals. Incident light intensity of a single beam was approximately . The data for LN:Fe, LN:Mg,Fe, and LN:Fe,Hf crystals were also listed for comparison (Refs. 9 and 11).
The concentration of and the ratio of in LN:Fe,Zr and LN:Fe,Hf crystals.
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