Observation of two-times self-focusing of femtosecond laser beam in ZnO crystal by two-photon luminescence

Wang, Xiaorui; Ye, Honggang; Su, Zhicheng; Yu, Dapeng; Xu, Shengqiang

doi:10.1016/j.scib.2018.10.004

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…Since the first semiconductor laser was invented in 1962, it has been rapidly developed and gradually applied in scientific research [1][2][3], national defense, industrial manufacturing and other fields. Subsequent wavelength tunability has been one of the important themes of laser performance optimization due to its demonstrated potential for white light generation [4], optical communication [5], on-chip photonic integration [6], and sensing [7,8].…”

Section: Introductionmentioning

confidence: 99%

Strain-modulated high-quality ZnO cavity modes on different crystal orientations

Chen

Peng

et al. 2020

Nanotechnology

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Dynamically regulated coherent light emission offers a significant impact on improving white light generation, optical communication, on-chip photonic integration, and sensing. Here, we have demonstrated two mechanisms of strain-induced dynamic regulation of ZnO lasing modes through an individual ZnO microbelt and microrod prepared by vapor-phase transport method. We systematically explained the dependence on externally applied strain and crystal orientation. Compared with the reduced size of resonant cavity played a major role in the microbelt, the resonant wavelength variation of the microrod under tensile stress is affected by the change in both the cavity size and the refractive index, which tends to antagonize in the direction of movement. It shows that the refractive index can be effectively regulated only when the stress is in the same direction along the c-axis. The results on the linear relationship between the resonance wavelength variation and applied strain imply the capacity of the devices to detect tiny stresses due to the ultra-narrow line width of the cavity mode with a high-quality factor of∼10 4 . It not only has a positive influence in the field of the modulated coherent light source, but also provides a feasible strategy for implementing color-resolved non-contact strain sensors.

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Section: Introductionmentioning

confidence: 99%

Strain-modulated high-quality ZnO cavity modes on different crystal orientations

Chen

Peng

et al. 2020

Nanotechnology

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“…Zinc oxide (ZnO) has served as one of the most promising materials for optoelectronic applications in ultraviolet (UV) regions such as light-emitting diodes, UV lasers, and UV detectors, due to its wide band gap (E g ∼3.37 eV) and high luminescence efficiency at room temperature. − Transition-metal-doped ( e.g. Co, Mn, etc.)…”

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confidence: 99%

Multiphonon Process in Mn-Doped ZnO Nanowires

et al. 2022

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The multiphonon process plays an essential role in understanding electron–phonon coupling, which significantly influences the optical and transport properties of solids. Multiphonon processes have been observed in many materials, but how to distinguish them directly by their spectral characteristics remains controversial. Here, we report high-order Raman scattering up to 10 orders and hot luminescence involving 11 orders of phonons in Mn-doped ZnO nanowires by selecting the excitation energy. Our results show that the intensity distribution of high-order Raman scattering obeys an exponential decrease as the order number increases, while hot luminescence is fitted with a Poisson distribution with a resonance factor. Their linewidth and frequency can be well explained by two different transition models. Our work provides a paradigm for understanding the multiphonon-involved decay process of an excited state and may inspire studies of the statistical characteristics of excited state decay.

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