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Multi-photon excited coherent random laser emission in ZnO powders

Tolentino Dominguez, Christian ; Gomes, Maria de A ; Macedo, Zélia S ; de Araújo, Cid B ; Gomes, Anderson S. L

Nanoscale, 2015-01, Vol.7 (1), p.317-323 [Peer Reviewed Journal]

England

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  • Title:
    Multi-photon excited coherent random laser emission in ZnO powders
  • Author: Tolentino Dominguez, Christian ; Gomes, Maria de A ; Macedo, Zélia S ; de Araújo, Cid B ; Gomes, Anderson S. L
  • Subjects: Coherence ; Emission spectra ; Excitation ; Lasers ; Nanostructure ; Polymerization ; Thresholds ; Zinc oxide
  • Is Part Of: Nanoscale, 2015-01, Vol.7 (1), p.317-323
  • Notes: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Description: We report the observation and analysis of anti-Stokes coherent random laser (RL) emission from zinc oxide (ZnO) powders excited by one-, two- or three-photon femtosecond laser radiation. The ZnO powders were produced via a novel proteic sol-gel, low-cost and environmentally friendly route using coconut water in the polymerization step of the metal precursor. One- and two-photon excitation at 354 nm and 710 nm, respectively, generated single-band emissions centred at about 387 nm. For three-photon excitation, the emission spectra showed a strong ultraviolet (UV) band (380-396 nm) attributed to direct three-photon absorption from the valence band to the conduction band. The presence of an intensity threshold and a bandwidth narrowing of the UV band from about 20 to 4 nm are clear evidence of RL action. The observation of multiple sub-nanometre narrow peaks in the emission spectra for excitation above the RL threshold is consistent with random lasing by coherent feedback. We report the observation and analysis of anti-Stokes coherent random laser (RL) emission from zinc oxide (ZnO) powders excited by one-, two- or three-photon femtosecond laser radiation.
  • Publisher: England
  • Language: English
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