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Related Experiment Videos

LED pumped polymer laser sensor for explosives.

Yue Wang1, Paulina O Morawska1, Alexander L Kanibolotsky2

  • 1Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews North Haugh, St Andrews, KY16 9SS, UK.

Laser & Photonics Reviews
|March 31, 2015
PubMed
Summary

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This study introduces a compact explosive vapor sensor using a polymer laser. The sensor detects nitroaromatic vapors with high sensitivity, showing a significant output change when exposed to trace amounts.

Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Materials Science

Background:

  • Development of sensitive and compact explosive vapor detection systems is crucial for security applications.
  • Polymer lasers offer potential for low-cost, portable sensing devices.
  • Distributed feedback (DFB) lasers provide wavelength selectivity and high optical gain.

Purpose of the Study:

  • To demonstrate a compact explosive vapor sensor based on a distributed feedback polymer laser.
  • To investigate the performance of the polymer laser when pumped by a commercial indium gallium nitride (InGaN) light-emitting diode (LED).
  • To evaluate the sensor's response to nitroaromatic explosive vapors.

Main Methods:

  • Fabrication of a distributed feedback polymer laser.
Keywords:
distributed feedback laserexplosive sensingindirect electrically pumpingorganic semiconductortriplet exciton

Related Experiment Videos

  • Pumping the polymer laser using a commercial InGaN light-emitting diode (LED).
  • Characterization of laser emission properties, including threshold behavior and output characteristics.
  • Exposure of the sensor to nitroaromatic model explosive vapors at parts-per-billion (ppb) concentrations.

    • Main Results:

    • The polymer laser exhibited a two-stage turn-on phenomenon attributed to the slow rise time of the LED pump pulses.
    • A pulsed output beam at 533 nm with a duration of approximately 10 ns was achieved.
    • Exposure to nitroaromatic vapors at approximately 8 ppb concentration resulted in a 46% change in the surface-emitted output.
    • The sensor demonstrated high sensitivity to trace amounts of explosive vapors.

    Conclusions:

    • A compact and sensitive explosive vapor sensor has been successfully demonstrated using a DFB polymer laser.
    • The InGaN LED-pumped polymer laser system shows promise for portable and cost-effective explosive detection.
    • The sensor's significant response to low concentrations of nitroaromatic vapors highlights its potential for real-world security applications.