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Effective mode selector for tunable terahertz wire lasers.

Qi Qin1, Ningren Han, Tsung-Yu Kao

  • 1Department of Electrical Engineering and Computer Science & Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. qiqin@mit.edu

Optics Letters
|March 5, 2013
PubMed
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This study presents a novel mode selector for terahertz quantum cascade wire lasers, ensuring robust single-mode operation at lower frequencies. The design effectively suppresses unwanted modes while maintaining laser performance and providing electrical bias.

Area of Science:

  • Quantum optics
  • Terahertz technology
  • Semiconductor lasers

Background:

  • Terahertz quantum cascade lasers (TQCLs) are crucial for spectroscopy and imaging.
  • Achieving stable single-mode operation in TQCLs, especially at frequencies below the gain peak, remains a challenge.
  • Wire lasers offer unique properties but require precise mode control.

Purpose of the Study:

  • To design and demonstrate an effective mode selector for terahertz quantum cascade wire lasers.
  • To achieve robust single-mode operation at frequencies significantly lower than the gain peak.
  • To enable extended tuning range and convenient electrical biasing.

Main Methods:

  • Development of a novel mode selector design.
  • Selective guiding of undesired laser modes into a lossy region.

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  • Integration of electrical bias connectors into the mode selector.

    • Main Results:

    • Demonstrated robust single-mode operation in terahertz quantum cascade wire lasers.
    • Achieved significant mode discrimination, enabling operation below the gain peak.
    • Confirmed that the mode selector does not degrade lasing performance and provides convenient biasing.

    Conclusions:

    • The demonstrated mode selector design is effective for achieving robust single-mode operation in terahertz quantum cascade wire lasers.
    • This design facilitates extended tuning range towards the lower half of the gain curve.
    • The integrated connectors offer a practical solution for electrical biasing without compromising performance.