1997, J. Appl. Phys., 82, 1, 10.1063/1.366265
1987, Appl. Phys. Lett., 51, 913, 10.1063/1.98799
1994, J. Lightwave Technol., 12, 2107, 10.1109/50.350620
1994, Appl. Phys. Lett., 64, 2718, 10.1063/1.111453
1993, Jpn. J. Appl. Phys., Part 2, 32, L514, 10.1143/JJAP.32.L514