We correct an error in the previous paper [Opt. Mater. Express 6, 2593 (2016)]. The electro-optic coefficients γ33 and γ13 that were measured by applying a DC voltage to the crystal via the Al films coated onto the crystal surfaces are the unclamped instead of clamped coefficients. In addition, the acknowledgment part is modified.
© 2016 Optical Society of America
In the previous paper , the EO coefficients γ33 and γ13 of homogeneously Ti4+-doped LiNbO3 crystals were measured by adopting two different voltage-applying schemes. In one scheme, here named scheme A for convenience, a DC voltage was applied to each crystal via a pair of external Cu slab electrodes (with a dimension of X × Y × Z = 40 mm × 50 mm × 0.5 mm). In another scheme, here named scheme B, a DC voltage was applied to the crystal through the 150 nm thick Al films coated onto two Z-surfaces of each crystal. In our previous paper, the γ33 and γ13 measured from the scheme A and B were considered as the unclamped and clamped coefficients, respectively. According to the definition, the EO coefficients as measured below and above the piezo-resonance are the unclamped (constant stress) and clamped (constant strain) coefficients, respectively . This means that the EO coefficient measured by applying a low-frequency or DC modulation voltage is unclamped. Regarding our measurements, as a DC voltage was applied to the crystal in both cases of scheme A and B, no clamped coefficients were actually obtained, all the measured γ13 and γ33 are unclamped. Thus, the originally claimed clamped γ13 and γ33 , which were measured from the scheme B, should be corrected as “unclamped γ13 and γ33”. The correction to the mistake in  involves the related description throughout the whole paper, including the Abstract, Introduction, Experimental description, Results and discussion, Conclusion, and Fig. 3 as well. Figure 1 shows the corrected version of original Fig. 3 in .
In addition, the acknowledgment part is modified by appending “and by Overseas, Hong Kong & Macao Scholars Cooperative Researching Fund of NSFC.” The corrected acknowledgments are below.
This work was supported by the National Natural Science Foundation of China under Project nos. 61377060, 61077039 and 50872089, by the Research Grants Council of the Hong Kong Special Administrative Region, China, under Project no 11211014, by the Key Program for Research on Fundamental to Application and Leading Technology, Tianjin Science and Technology Commission of China under Project no. 16JCZDJC37400, and by Overseas, Hong Kong & Macao Scholars Cooperative Researching Fund of NSFC.
References and links
1. W. Y. Du, Z. B. Zhang, J. Q. Xu, W. H. Wong, D. Y. Yu, E. Y. B. Pun, and D. L. Zhang, “Electro-optic property of Ti4+-doped LiNbO3 single crystals,” Opt. Mater. Express 6(8), 2593–2599 (2016). [CrossRef]
2. M. Abarkan, J. P. Salvestrini, M. D. Fontana, and M. Aillerie, “Frequency and wavelength dependences of electro-optic coefficients in inorganic crystals,” Appl. Phys. B 76(7), 765–769 (2003). [CrossRef]