1. S. Li, L. Wang, T. Zhai, Z. Xu, Y. Wang, J. Wang, and X. Zhang, Opt. Express, 23, No. 18, 23985–23991 (2015).
2. M. C. Cheung, K. Y. Yung, H. Xu, N. D. Kraut, V. P. Chodavarapu, A. N. Cartwright, and F. V. Bright, IEEE J. Sel. Top. Quantum Electron., 18, No. 3, 1147–1159 (2012).
3. Z. Liu, Y. Chen, L. Zhao, Y. Zhang, Y. Wei, H. Li, Y. Liu, Y. Zhang, E. Zhao, X. Yang, J. Zhang, and L. Yuan, Оpt. Lett., 41, No. 13, 2966–2969 (2016).
4. Y.-C. Chen, Q. Chen, and X. Fan, Optica, 3, No. 8, 809–815 (2016).
5. O. N. Bezkrovnaya, V. V. Maslov, I. M. Pritula, A. G. Yurkevich, M. A. Chaika, Yu. A. Gurkalenko, and N. V. Pereverzev, Zh. Prikl. Spektrosk., 84, No. 1, 39–43 (2017) [O. N. Bezkrovnaya, V. V. Maslov, I. M. Pritula, A. G. Yurkevich, M. A. Chaika, Yu. A. Gurkalenko, and N. V. Pereverzev, J. Appl. Spectrosc., 84, No. 1, 31–34 (2017)].