1. R. C. Stoneman and L. Esterowitz, Opt. Lett. 15, 486 (1990).
2. A. Dergachev, K. Wall, and P. F. Moulton, in Proceedings of Advanced Solid-State Lasers, Eds. by M. E. Fermann and L. R. Marshall, Vol. 68 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2002), pp. 343–346.
3. V. Petrov, U. Griebner, F. Guell, J. Massons, Jna. Gavalda, R. Sole, M. Aguilo, and F. Diaz, in Proceedings of EPSQEOD Europhoton Conference on “Solid-State and Fiber Coherent Light Sources” (European Physical Society, Mulhouse Cedex, France, 2004), paper ThA3.
4. S. Vatnik, I. Vedin, M. C. Pujol, X. Mateos, J. J. Carvajal, M. Aguilo, F. Diaz, U. Griebner, and V. Petrov, Laser Phys. Lett. 7, 435 (2010).
5. M. S. Gaponenko, V. E. Kisel, N. V. Kuleshov, A. M. Malyarevich, K. V. Yumashev, and A. A. Onushchenko, Laser Phys. Lett. 7, 286 (2010).