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Updated: May 24, 2026

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Continuously tunable solution-processed organic semiconductor DFB lasers pumped by laser diode.

Sönke Klinkhammer1, Xin Liu, Klaus Huska

  • 1Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany.

Optics Express
|March 16, 2012
PubMed
Summary
This summary is machine-generated.

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Researchers developed continuously tunable, solution-processed distributed feedback (DFB) lasers in the visible spectrum. These lasers offer broad spectral tuning on a single chip using inexpensive laser diodes for pumping.

Area of Science:

  • Materials Science
  • Optoelectronics
  • Photonics

Background:

  • Distributed feedback (DFB) lasers are crucial for various optical applications.
  • Achieving continuous tunability in solution-processed visible lasers remains a challenge.
  • Existing methods often lack scalability or broad spectral coverage.

Purpose of the Study:

  • To report the fabrication and characterization of continuously tunable, solution-processed DFB lasers in the visible regime.
  • To demonstrate broad spectral tuning capabilities on a single chip.
  • To investigate the feasibility of using low-cost laser diodes for pumping.

Main Methods:

  • Fabrication of DFB lasers using horizontal dipping of conjugated polymer and small molecule solutions.
  • Creation of continuous thin film thickness gradients on cm-scale surface gratings.

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  • Optical pumping and characterization of laser emission across the visible spectrum.

    • Main Results:

    • Continuous thin film thickness gradients achieved via controlled dipping technique.
    • Optically pumped, continuously tunable laser emission demonstrated with 13 nm (blue), 16 nm (green), and 19 nm (red) tuning ranges on a single chip.
    • Laser threshold is sufficiently low for pumping with inexpensive laser diodes.

    Conclusions:

    • Successfully fabricated continuously tunable, solution-processed DFB lasers in the visible spectrum.
    • Demonstrated significant spectral tuning ranges on a single chip, offering versatility.
    • The low laser threshold indicates potential for cost-effective and practical optoelectronic devices.