1. 1. A.H.Kevshyn, V.V.Halyan, T.A.Semenyuk, Phys. Chem. Solid State, 16, 245 (2015).
2. 2. J.Hostasa, L.Esposito, A.Malchere, J. Mater. Res., 29, 2288, (2014).
3. 3. V.I.Zhekov, T.M.Murina, A.M.Prokhorov et al., Quant. Electron., 13, 419 (1986).
4. 4. Koechner, M.Bass, Solid-State Lasers, Springer-Verlag, New York (2003).
5. 5. R.C.Stoneman, Solid-State Lasers and Applications, CRC Press Taylor & Francis Group, Boca Raton, London, New York (2007).