Charge transfer processes and UV induced absorption in Yb:YAG single crystal laser materials
2013 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 113, no 22, Art. no. 223510- p.Article in journal (Refereed) Published
Charge transfer (CT) transitions and UV induced color centers in Yb:YAG single crystals have been investigated. A simultaneous pair formation of a stable Yb2+ ion and a hole related (O -) color center (hole polaron) are observed through a CT-process. Slightly different types of hole related color centers are formed in Yb:YAG crystals containing small levels of iron impurities. Furthermore, excitation spectroscopy on the UV irradiated Yb:YAG samples could confirm an energy transfer process between Yb3+ and Yb2+ ions. The findings are important for an increased knowledge of the physical loss mechanisms observed in Yb-doped laser materials, such as the nonlinear decay process in Yb:YAG crystals as well as the photodarkening phenomenon in Yb-doped fiber lasers.
Place, publisher, year, edition, pages
2013. Vol. 113, no 22, Art. no. 223510- p.
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:miun:diva-18685DOI: 10.1063/1.4810858ISI: 000320675300012ScopusID: 2-s2.0-84879212765Local ID: STCOAI: oai:DiVA.org:miun-18685DiVA: diva2:614290