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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Five-photon absorption upconversion lasing from on-chip whispering gallery mode.

Ying Huang1, Hai Zhu1, Huying Zheng1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China. zhuhai5@mail.sysu.edu.cn.

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This summary is machine-generated.

Researchers achieved low-threshold upconversion lasing using five-photon absorption in microcavities. This advancement in ultrafast optics enhances short-wavelength laser sources by boosting nonlinear optical processes.

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Area of Science:

  • Ultrafast optics
  • Nonlinear optics
  • Materials science

Background:

  • Nonlinear light-matter interactions are crucial in ultrafast optics.
  • High-order nonlinear effects, like multi-photon absorption (MPA), drive short-wavelength laser research.

Purpose of the Study:

  • To realize amplified spontaneous emission (ASE) and low-threshold upconversion lasing via MPA.
  • To investigate microcavity enhancement of high-order nonlinear optical processes.

Main Methods:

  • Simultaneous ASE realization by MPA in epitaxy thin films.
  • Utilizing high-Q cylindrical microcavities for optical confinement.
  • Finite difference time domain (FDTD) simulation for whispering-gallery mode (WGM) analysis.

Main Results:

  • Demonstrated first low-threshold upconversion lasing of five-photon absorption enhanced by a microcavity at room temperature.
  • Achieved high optical confinement (Q ~ 4 × 10^3) in on-chip cylindrical microcavities.
  • Found significant enhancement of high-order nonlinear optical processes due to increased photon lifetime in microcavities.

Conclusions:

  • Microcavities effectively enhance high-order nonlinear optical processes like MPA upconversion lasing.
  • This work paves the way for developing novel short-wavelength laser sources.
  • The findings highlight the importance of optical confinement for advanced nonlinear optics applications.