caa a22 4500 445369434 CHVBK 20180317142941.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s00340-010-4283-4 doi (NATIONALLICENCE)springer-10.1007/s00340-010-4283-4 Optical gain by upconversion in Tm-Yb oxyfluoride glass ceramic [Elektronische Daten] [P. Haro-González, I. Martín, F. Lahoz, N. Capuj] Evidence of positive optical gain is observed in Tm3+-Yb3+-codoped oxyfluoride glass ceramic in an upconversion pump and probe experiment. The 1G4 level of the Tm3+ ions is populated by an upconversion mechanism under excitation of the Yb3+ ions at 975nm with a high-power pulsed laser and give rise to an intense emission from the 1G4 to the 3F4 levels. The 1G4→3F4 electronic transition is stimulated with a low signal at 650nm as a probe. Under this condition, we reach the population inversion necessary between the Tm3+ levels of the transition 1G4→3F4 and we observed an increase of the emission intensity at the signal wavelength due to the stimulated emission. Apositive optical gain of around 4cm−1 (∼17dB/cm) has been measured in Tm-Yb-codoped oxyfluoride glass ceramic. Springer-Verlag, 2010 Haro-González P. Departamento de Física Fundamental, Electrónica y Sistemas, La Laguna, Tenerife, Spain aut Martín I. MALTA Consolider Team, La Laguna, Tenerife, Spain aut Lahoz F. Departamento de Física Fundamental, Electrónica y Sistemas, La Laguna, Tenerife, Spain aut Capuj N. Departamento de Física Básica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain aut Applied Physics B Springer-Verlag 104/1(2011-07-01), 237-240 0946-2171 104:1<237 2011 104 340 https://doi.org/10.1007/s00340-010-4283-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-010-4283-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Haro-González P. Departamento de Física Fundamental, Electrónica y Sistemas, La Laguna, Tenerife, Spain aut NATIONALLICENCE 700 1- Martín I. MALTA Consolider Team, La Laguna, Tenerife, Spain aut NATIONALLICENCE 700 1- Lahoz F. Departamento de Física Fundamental, Electrónica y Sistemas, La Laguna, Tenerife, Spain aut NATIONALLICENCE 700 1- Capuj N. Departamento de Física Básica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/1(2011-07-01), 237-240 0946-2171 104:1<237 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer