title: Optical properties of Cr2+:ZnSe single crystal and film.
abstract: To realize an electrically pumped compact mid-IR microlaser, the optical properties of a Cr(2+):ZnSe film deposited by rf magnetron cosputtering were compared with those of a single crystal. The mid-IR room temperature photoluminescence efficiency of the film appears only twice less than the one of the single crystal under direct (1850 nm) and indirect (458 nm) excitations. The smaller Cr(2+) fluorescence lifetime values of the film were attributed to the presence in the film of a large amount of chromium in a valence state different from Cr(2+) and of structural defects in the ZnSe host matrix.
authors.affiliation: Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP)-ENSICAEN, 6 Bd. du Maréchal Juin, F-14050 Caen, France.
authors.forename: N
authors.initials: N
authors.lastname: Vivet
authors.forename: M
authors.initials: M
authors.lastname: Morales
authors.forename: M
authors.initials: M
authors.lastname: Levalois
authors.forename: J L
authors.initials: JL
authors.lastname: Doualan
mesh_terms: D002857:Chromium / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D008027:Light; D008422:Materials Testing; D008567:Membranes, Artificial; D012031:Refractometry; D012542:Scattering, Radiation; D018036:Selenium Compounds / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D018036:Selenium Compounds; D017967:Zinc Compounds; D002857:Chromium; C044696:zinc selenide