Application of WGM Resonances to the Measurement of the Temperature Increment of Ho and Ho-Yb Doped Optical Fibers Pumped at 1125 and 975 nm. - Xavier Rosello-Mecho; Martina Delgado-Pinar; Yuri O. Barmenkov; Alexander V. Kir'yanov; Miguel V. Andrés (Sensors, 2021)