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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Broadly tunable monolithic room-temperature terahertz quantum cascade laser sources.

Seungyong Jung1, Aiting Jiang1, Yifan Jiang1

  • 1Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.

Nature Communications
|July 12, 2014
PubMed
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Room-temperature, electrically pumped semiconductor sources are key for compact terahertz (THz) instrumentation. This study demonstrates tunable THz lasers with electrical control, enabling broadband frequency tuning for THz sensing and spectroscopy.

Area of Science:

  • Terahertz (THz) semiconductor sources
  • Optoelectronics
  • Solid-state physics

Background:

  • Compact, tunable THz sources are crucial for advanced sensing and spectroscopy.
  • Quantum cascade lasers (QCLs) with difference-frequency generation (DFG) are the only current room-temperature, electrically pumped THz sources for the 1-5 THz range.

Purpose of the Study:

  • To demonstrate the suitability of QCL-DFG technology for monolithic, room-temperature THz tuners.
  • To achieve broadband electrical control over THz emission frequency.

Main Methods:

  • Utilizing quantum cascade lasers with intra-cavity difference-frequency generation.
  • Fabricating and characterizing ridge waveguide devices for THz emission.
  • Implementing electrical tuning mechanisms for frequency control.

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Main Results:

  • Demonstrated monolithic room-temperature THz tuners.
  • Achieved electrical tunability of emission frequency.
  • Experimentally confirmed tunability between 3.44 and 4.02 THz for ridge waveguide devices.

Conclusions:

  • QCL-DFG technology is viable for developing room-temperature, electrically tunable THz sources.
  • This advancement supports the development of compact instrumentation for THz applications.
  • Broadband electrical control of emission frequency is feasible with this approach.