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Flexible polymer waveguide tunable lasers.

Kyung-Jo Kim1, Jun-Whee Kim, Min-Cheol Oh

  • 1School of Electrical Engineering, Pusan National University, Pusan (Busan), 609-735, Republic of Korea.

Optics Express
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A novel flexible polymer Bragg reflector allows widely tunable lasers. This elastic device, strained up to 100 nm, offers a broader tuning range than existing technologies.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Superluminescent laser diodes (SLEDs) are crucial for tunable laser applications.
  • Existing tunable Bragg reflectors, such as silica fiber Bragg gratings and thermo-optic devices, have limitations in tuning range and structural complexity.

Purpose of the Study:

  • To demonstrate a widely tunable laser using a compact and simple structure.
  • To develop a flexible polymeric Bragg reflector capable of wide wavelength tuning via strain.
  • To compare the performance of the polymer Bragg reflector with existing technologies.

Main Methods:

  • Fabrication of a flexible polymeric Bragg reflector.
  • Integration of the Bragg reflector with a superluminescent laser diode for external feedback.
  • Application of both compressive and tensile strains ( -36000 to 35000 microepsilon) to tune the Bragg wavelength.

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  • Characterization of the laser's wavelength tuning range and side mode suppression ratio.

    • Main Results:

    • The flexible polymeric Bragg reflector enabled continuous tuning of the Bragg reflection wavelength over a range of up to 100 nm.
    • The external feedback laser demonstrated a repetitive wavelength tuning range of 80 nm.
    • A side mode suppression ratio of 35 dB was achieved, indicating good laser performance.

    Conclusions:

    • A flexible polymeric Bragg reflector is a viable and effective component for creating widely tunable lasers.
    • Strain-induced tuning of the polymer Bragg reflector offers a significantly wider tuning range compared to silica fiber Bragg gratings and thermo-optic polymer devices.
    • The developed laser system exhibits a compact structure and robust performance, paving the way for advanced laser applications.