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Related Experiment Video

Updated: Nov 21, 2025

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Tunable WGM Laser Based on the Polymer Thermo-Optic Effect.

Shuai Zhang1, Tianrui Zhai1, Libin Cui1

  • 1College of Physics and Optoelectronics, Faculty of Science, Beijing University of Technology, Beijing 100124, China.

Polymers
|January 12, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a tunable laser using the thermo-optic effect in polymers. This polymer laser offers continuous wavelength tuning and sensitive temperature response for sensing applications.

Keywords:
continuously tunablethe two-ring coupling effectthermo-optic effectwhispering-gallery-mode laser

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Whispering-gallery-mode (WGM) lasers are micro-cavity lasers with applications in sensing and photonics.
  • Thermo-optic effect, the change in refractive index with temperature, is crucial for tuning laser properties.

Purpose of the Study:

  • To fabricate a temperature-tunable WGM laser utilizing the thermo-optic effect in conjugated polymers.
  • To investigate the influence of organic solvents on the tuning rate of the polymer laser.

Main Methods:

  • Fabrication of a WGM laser using a capillary tube filled with a light-emitting conjugated polymer solution.
  • Utilizing the thermo-optic effect of the polymer for continuous wavelength tuning.
  • Studying the effect of different organic solvents on the laser's tuning rate.

Main Results:

  • Achieved continuous wavelength tuning of approximately 19.5 nm.
  • Obtained a temperature-resolved tuning rate of ~1.55 nm/°C for a typical lasing mode (0.08 nm bandwidth).
  • Observed suppression of WGM due to a two-ring coupling effect.

Conclusions:

  • The polymer-based WGM laser demonstrates sensitive temperature response, good reversibility, and repeatability.
  • The developed laser is suitable for applications in photothermic and sensing devices.
  • The study highlights the potential of thermo-optic polymers for tunable laser design.