Low-threshold two-photon pumped ZnO nanowire lasers

Chunfeng Zhang, Fan Zhang, Tian Xia, Nitin Kumar, Jong In Hahm, Jin Liu, Zhong Lin Wang, Jian Xu

Research output: Contribution to journalArticlepeer-review

106 Scopus citations


We report in this communication the two-photon absorption (TPA)-induced room-temperature lasing performance of ZnO nanowires. Under femtosecond pulse-excitation at λ = 700 nm in the infrared regime, a remarkably low threshold of 160μJ/cm2 was observed for the TPA-induced lasing action, which is of the same order of magnitude as that measured for the linear lasing process. Time-resolved photoluminescence characterization of two-photon pumped ZnO nanowires reveals the presence of a fast decay (3-4 ps) in the stimulated emission as compared to the slow decay (50-70 ps) for the spontaneous emission. The TPA process in ZnO nanowires was characterized with the nonlinear transmission measurement, which uncovers an enhanced TPA coefficient, about 14.7 times larger than that of bulk ZnO samples. The observed TPA enhancement in ZnO nanowires accounts for the low threshold lasing behavior, and has been attributed to the intensified optical field confined within the nanowire waveguides.

Original languageEnglish (US)
Pages (from-to)7893-7900
Number of pages8
JournalOptics Express
Issue number10
StatePublished - May 11 2009

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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