Abstract
The two-photon excited UV laser with narrow line width and high Q value was obtained. The total internal reflection from the four side surfaces of the quadrilateral-ZnO microwire offered the whispering gallery mode (WGM) resonant cavity. The UV emission, resonant mechanism, and laser mode characteristics were discussed in detail for this special type of micro-cavity. In addition, in order to enhance the power of the two-photon excited UV laser, the surface plasmon enhancement by the Au nanoparticles was also performed and explained well by the theory of the localized surface plasmon.
Highlights
Multi-photon pumped lasing (MPPL) has received increasing attentions due to the broad range of possible applications in wavelength up-conversion, 3D fluorescence imaging, and 3D microfabrication.[1,2,3] Unlike common second-harmonic generation, MPPL can convert lower frequency incident photons into higher frequency emission photons through multi-photon processes without the phase-matching requirements
We found the nano-metal surface plasmon resonanceenhanced two-photon excited whispering gallery mode (WGM) ultra-violet lasing in ZnO microwires
The ZnO microwires were prepared by the chemical vapor deposition (CVD) method with the reaction of carbon thermal reduction.[16,17]
Summary
Multi-photon pumped lasing (MPPL) has received increasing attentions due to the broad range of possible applications in wavelength up-conversion, 3D fluorescence imaging, and 3D microfabrication.[1,2,3] Unlike common second-harmonic generation, MPPL can convert lower frequency incident photons into higher frequency emission photons through multi-photon processes without the phase-matching requirements. The research of ZnO micro UV laser has attracted wide attentions, and the whispering gallery mode (WGM) laser,[4,5,6,7,8,9,10,11,12] is one important research directions in the field of micro-cavity quantum electrodynamics, optical fiber communication and sensor,[12,13] because of its high quality factor, high gain coefficient and lower lasing threshold.
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