 Celestino went back to Spain in 2000, getting a position at the CSIC, first as a senior scientist and later as a research professor.In 2005 she got the position of titular scientist of the CSIC, developing her own Institute of Optics.In 2006, she was awarded the position of professor of research at the CSIC, and in 2008 she was nominated director of the Institute of Optics "Daza de Valdés".