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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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THz quantum cascade lasers with wafer bonded active regions.

M Brandstetter1, C Deutsch, A Benz

  • 1Photonics Institute and Center for Micro- and Nanostructures, Vienna University of Technology, Gusshausstrasse 29, A-1040 Vienna, Austria. martin.brandstetter@tuwien.ac.at

Optics Express
|November 29, 2012
PubMed
Summary

We developed thicker terahertz quantum-cascade lasers (TQCLs) using wafer bonding. This significantly boosts optical power output by over 2x without impacting performance, enhancing TQCL applications.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Terahertz quantum-cascade lasers (TQCLs) are crucial for various applications.
  • Improving TQCL performance, such as output power, is an ongoing research area.
  • Waveguide design significantly influences TQCL efficiency and output characteristics.

Purpose of the Study:

  • To investigate the impact of increased active region thickness on TQCL performance.
  • To demonstrate a fabrication method for thicker TQCL active regions.
  • To enhance optical power generation and reduce losses in TQCLs.

Main Methods:

  • Fabrication of TQCLs with a 30 μm thick double-metal waveguide.
  • Utilizing a wafer bonding process to stack two 15 μm thick active regions.

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  • Characterization of optical power, threshold current, and operating temperature.

    • Main Results:

    • Achieved a significant increase in output power (more than a factor of 2).
    • Demonstrated reduced waveguide losses due to increased active region thickness.
    • Observed improved far-field characteristics owing to a larger facet aperture.
    • Maintained maximum operating temperature and threshold current levels.

    Conclusions:

    • Increasing active region thickness via wafer bonding is an effective strategy for enhancing TQCL output power.
    • The demonstrated approach offers a pathway to higher-performance TQCLs without compromising operational parameters.
    • This advancement has implications for developing more powerful terahertz sources.