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Physics of the sapphire whispering-gallery-mode solid-state MASER oscillator
Mohamad Mrad, Ahmad Tarhini, Pierre-Yves Bourgeois and Vincent Giordano The European Physical Journal Applied Physics 91(3) 31001 (2020) https://doi.org/10.1051/epjap/2020200107
Absorbance and energy levels for a Fe3+ ion in α-Al2O3. Optical pumping applied to a 31 GHz maser