Single-frequency operation of an orange avalanche upconversion laser for high-resolution laser spectroscopyT. H. My, Ph. Goldner, O. Guillot-Noël, M. Tonelli and F. BretenakerEur. Phys. J. Appl. Phys., 42 2 (2008) 121-124DOI: https://doi.org/10.1051/epjap:2008030