title: Stimulated emission of hydrothermal growth ZnO nanorods with low threshold.
abstract: The optically pumped stimulated emission was observed from random growth ZnO nanorods. A thin metal layer was sputtered on Si wafer serving as a substrate. ZnO nanorods were grown on the thin metal layer using a hydrothermal method. Photoluminescence (PL) measurements were adopted to analyze the optical properties of the ZnO nanorods. A strong UV emission and a weak deep-level emission were observed. Under the excitation of 350 nm fs laser, a sharp ultra-violet emission peak located at around 388 nm was observed. Furthermore, with increasing the pump intensity the width of the emission peak narrowed. The analysis of the emission behavior suggested the stimulated emission was generated with a low threshold of 28 kW/cm2.
authors: Changchun University of Science and Technology, Changchun 130022, China.
authors: Zhongkui
authors: Z
authors: Zheng
authors: Qingduo
authors: Q
authors: Duanmu
authors: Dongxu
authors: D
authors: Zhao