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Related Experiment Video

Updated: Jun 26, 2026

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

Thermo-recurrent nematic random laser.

S Ferjani¹, A De Luca, V Barna

¹LICRYL CNR-INFM and Center of Excellence CEMIF.CAL, Department of Physics, University of Calabria, Rende (CS), Italy.

|February 4, 2009

Summary

This study explores thermal effects on random laser action in dye-doped liquid crystals. Increased temperature shifts the lasing threshold, reducing intensity due to enhanced scattering and optical losses.

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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Published on: December 5, 2025

Area of Science:

Optics and Photonics
Materials Science
Condensed Matter Physics

Background:

Random lasers offer unique light generation properties.
Liquid crystals exhibit complex phase transitions and tunable optical characteristics.
Understanding thermal effects is crucial for optimizing laser performance.

Purpose of the Study:

Investigate the temperature dependence of random laser action in dye-doped nematic liquid crystals.
Analyze the impact of thermal fluctuations and phase transitions on laser characteristics.
Identify mechanisms responsible for random lasing behavior near the nematic-isotropic phase transition.

Main Methods:

Experimental setup for observing random laser action.
Temperature control and variation of dye-doped nematic liquid crystal samples.
Analysis of input-output power characteristics and emission intensity as a function of temperature.

Main Results:

Random laser characteristics show significant temperature dependence in the nematic phase.
Increasing temperature lowers laser emission intensity and shifts the lasing threshold.
Optical losses increase with temperature due to enhanced scattering, suppressing lasing.
Random lasing unexpectedly reoccurs near the nematic-isotropic transition due to micro-droplet nucleation and critical opalescence.

Conclusions:

Thermal fluctuations significantly influence random laser action in liquid crystals.
The nematic-isotropic phase transition introduces unique scattering mechanisms affecting lasing.
This research provides insights into controlling and optimizing random lasers in liquid crystal systems.