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Random Error01:04

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Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
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A Highly-Efficient Single Segment White Random Laser.

Golam Haider1,2,3,4, Hung-I Lin3, Kanchan Yadav2,5

  • 1Department of Engineering and System Science , National Tsing Hua University , Hsinchu 300 , Taiwan.

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|October 24, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a simple, efficient white random laser using core-shell nanoparticles and hyperbolic metamaterials. This breakthrough enables multicolor laser emission for applications like advanced lighting and displays.

Keywords:
high photonic density of stateshyperbolic meta-materialssingle segment multicolor laserup-conversionwhite random laser

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • Producing multicolor lasers from a single chip is challenging due to material and design complexities.
  • Existing methods struggle with efficient multicolor emission for applications like solid-state lighting and laser displays.

Purpose of the Study:

  • To demonstrate a simple design for a highly efficient single-segment white random laser.
  • To achieve multicolor lasing across the visible spectrum from a single device.

Main Methods:

  • Utilized solution-processed NaYF4:Yb/Er/Tm@NaYF4:Eu core-shell nanoparticles.
  • Incorporated Au/MoO3 multilayer hyperbolic metamaterials to enhance photonic density of states.
  • Employed finite-difference time-domain (FDTD) simulations for electromagnetic analysis.

Main Results:

  • Achieved simultaneous red, green, and blue multicolor lasing emission.
  • Enhanced energy upconversion emission by approximately 50 times.
  • Significantly reduced the lasing threshold due to enhanced light-matter interaction.

Conclusions:

  • The developed hyperbolic metamaterial-assisted random laser offers a simplified design for color-tunable laser structures.
  • The angle-free laser action makes it a promising solution for practical laser applications.
  • This approach is extendable to other material systems for diverse laser applications.