Journal of Applied Spectroscopy
On the nature of the two-photon excitation of the luminescence of Er3+ and Ho3+ in CaF2 by a neodymium laser
Pavel A Apanasevich, R. I. Gintoft, A. G. Makhanek
Journal of Applied Spectroscopy
Pavel A Apanasevich, R. I. Gintoft, A. G. Makhanek