[1] Campo J C, Perez M A, Mezquita J M. in Proceedings of APEC 97-Applied Power Electronics Conference, 1997, 2: 1057.
[7] Goncz J H, Newell P B. JOSA, 1966, 56(1): 87.
[8] Gusinow M. IEEE Journal of Quantum Electronics, 1975, 11(12): 929.
[9] Baksht E K, Boichenko A M, Galakhov I V, et al. Laser Physics, 2007, 17(6): 782.