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Dye lasing in optically manipulated liquid aerosols.

Y Karadag1, M Aas, A Jonáš

  • 1Department of Physics, Koç University, Istanbul, Turkey.

Optics Letters
|August 14, 2013
PubMed
Summary

Researchers achieved dye lasing in airborne microdroplets using optical tweezers. The droplet whispering gallery modes (WGMs) showed tunable lasing wavelengths, offering new methods for probing atmospheric particles.

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Area of Science:

  • Optics and Photonics
  • Atmospheric Science
  • Laser Physics

Background:

  • Microdroplets can act as optical cavities supporting whispering gallery modes (WGMs).
  • Dye-doped microdroplets have potential for lasing applications.
  • Optical tweezers enable precise manipulation and study of individual microdroplets.

Purpose of the Study:

  • To demonstrate and characterize dye lasing in airborne microdroplets.
  • To investigate the tunability of lasing wavelengths based on droplet size.
  • To explore potential applications in atmospheric sensing.

Main Methods:

  • Airborne glycerol-water microdroplets (7.7–11.0 μm diameter) doped with rhodamine B were generated.
  • Optical tweezers were used to trap individual microdroplets.

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  • A Q-switched green laser served as the pump source for stimulated emission.

    • Main Results:

    • Nonlinear intensity dependence of droplet WGMs on pump laser fluence confirmed dye lasing.
    • Lasing wavelengths were tunable between 600 and 630 nm by adjusting droplet size.
    • Whispering gallery mode lasing was successfully achieved in airborne microdroplets.

    Conclusions:

    • Airborne dye-doped microdroplets can function as tunable laser cavities.
    • The high sensitivity of stimulated emission in these microdroplet lasers can be exploited for sensing applications.
    • This work opens avenues for novel atmospheric probing techniques.