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Red Random Laser Based on Thermocavitation : Synthesis and Characterization.

Jassim Mohammed Jassim1, Majid F Haddawi2, M J Mohammed3

  • 1Department of Laser Physics, College of Science for Women, University of Babylon, Hillah, Iraq. wsci.jassem.mohamed@uobabylon.edu.iq.

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Summary
This summary is machine-generated.

This study investigates thermal blooming (TB) in nanoparticle-infused dye solutions using a CW laser. Nanoparticles influence thermocavitation and random laser actions, impacting emission spectra properties.

Keywords:
Ag NWsBubble scatteringFe2O3 MNPsKiton red dyeRandom laserThermal blooming (TB)Thermocavitation

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Area of Science:

  • Laser Physics
  • Nanomaterials Science
  • Fluid Dynamics

Background:

  • Self-phase modulation (SPM) is a nonlinear optical phenomenon.
  • Thermal blooming (TB) follows SPM as a fluid heats and deforms under laser irradiation.
  • Nanoparticles can alter thermal and optical properties of fluids.

Purpose of the Study:

  • To investigate thermal blooming phenomena in dye solutions with various nanoparticles.
  • To analyze the effect of nanoparticles on thermocavitation and bubble formation.
  • To study the influence of thermal cavitation on random laser actions.

Main Methods:

  • Utilized a continuous-wave (CW) laser at 405 nm with 100 mW optical power.
  • Focused the laser beam onto a quartz cuvette containing dye solution with Ag NWs, Fe₂O₃, and AgNWs: Fe₂O₃ nanoparticles.
  • Observed far-field diffraction patterns and characterized random laser actions.

Main Results:

  • Observed a shift from self-phase modulation (SPM) loops to a distinct diffraction pattern indicating thermal blooming (TB).
  • Demonstrated that nanoparticles (Ag NWs, Fe₂O₃) affect the speed and number of bubble formations during thermocavitation.
  • Noted random laser actions in both the presence and absence of thermal cavitation.
  • Found that thermal cavities significantly impact pump threshold, spectral linewidth, and emission intensity.

Conclusions:

  • Thermal blooming is a distinct phase following SPM, influenced by nanoparticle-induced thermocavitation.
  • Nanoparticles play a crucial role in modulating thermocavitation dynamics and random laser emission.
  • The presence of a thermal cavity significantly alters the characteristics of laser emission spectra.