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Ultrabroadband Heterogeneous THz Quantum Cascade Laser.

Michael Jaidl1,2, Maximilian Beiser2,3, Miriam Giparakis2,3

  • 1Photonics Institute, TU Wien, Gusshausstrasse 27-29, 1040 Vienna, Austria.

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|January 24, 2023
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Summary
This summary is machine-generated.

This study presents a novel heterogeneous terahertz quantum cascade laser. This device achieves broadband emission from 1.9 to 4.5 THz, enabling advanced spectroscopy and light source applications.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Broadband terahertz (THz) emission is crucial for spectroscopy and white light sources.
  • Terahertz quantum cascade lasers (TQCLs) offer high output power and wavelength tunability via bandstructure engineering.
  • Combining multiple active regions in a single TQCL can achieve broadband emission.

Purpose of the Study:

  • To develop a single-device TQCL capable of broadband THz emission.
  • To demonstrate a heterogeneous TQCL design integrating multiple active regions.
  • To investigate the performance of a novel three-well active region design for high-temperature operation.

Main Methods:

  • Fabrication of a heterogeneous TQCL comprising five distinct active regions.
  • Utilizing a three-well, LO-phonon depopulation design for active regions.
  • Characterization of laser performance in pulsed and continuous-wave (CW) operation.

Main Results:

  • The heterogeneous TQCL successfully lased in both pulsed and CW modes.
  • Broadband emission was achieved across a spectral range of 1.9 to 4.5 THz (1.37 octaves).
  • The device demonstrated a maximum operating temperature of 143 K in pulsed mode.

Conclusions:

  • Heterogeneous TQCLs are a viable technology for generating broadband THz radiation.
  • The three-well active region design facilitates high-temperature operation.
  • This technology advances compact, high-power THz sources for diverse applications.