Seven-Photon-Excited Upconversion Lasing at Room Temperature

Hai Zhu, An Q. Chen, Yan Y. Wu, Wen F. Zhang, Shi C. Su, Xu Ji, Peng T. Jing, Siu F. Yu, Chong X. Shan, Feng Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


In contrast to conventional harmonic generation, realized using nonlinear crystal, the multiphoton-excited (MPE) laser has critical applications in fluorescence imaging probe and biological photonics. Here, lasing emission from a crystal plate under 7-photon excitation at room temperature is reported for the first time, which is the highest order MPE lasing reported up to date. Moreover, MPE lasing spikes and high-order harmonic peaks are observed simultaneously. The saturation behavior of harmonic generation and abnormal fluorescence enhancement identify that the interaction of photon–electron in 7-photon-excited lasing transits from photon-excited to a more field-driven regime. The results may pave the way for short wavelength laser by taking advantage of the processability and larger scale of solid crystals.

Original languageEnglish
Article number1800518
JournalAdvanced Optical Materials
Issue number16
Publication statusPublished - 20 Aug 2018


  • lasing mode
  • multiphoton excitation
  • quantum tunneling
  • solid crystals
  • upconversion lasing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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