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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Discrete mode tuning in terahertz quantum cascade lasers.

Subhasish Chakraborty1, Owen Marshall, Chen Wei Hsin

  • 1School of Electrical and Electronic Engineering, University of Manchester, UK. s.chakraborty@manchester.ac.uk

Optics Express
|December 25, 2012
PubMed
Summary

This study demonstrates a new multi-resonance filter for terahertz quantum cascade lasers (QCLs), enabling precise electronic tuning and dual-mode lasing for advanced THz applications.

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Area of Science:

  • Optics and Photonics
  • Quantum Electronics
  • Terahertz Technology

Background:

  • Quantum cascade lasers (QCLs) are crucial for terahertz (THz) applications.
  • Achieving precise frequency control in THz QCLs remains a challenge.
  • Existing Fabry-Pérot (FP) cavities often support multi-mode operation.

Purpose of the Study:

  • To enhance single-mode selectivity and enable discrete electronic tuning in THz QCLs.
  • To investigate dual-mode lasing with electrically controlled frequency separation.
  • To explore a phase-sensitive mode selection mechanism.

Main Methods:

  • A holographically designed, aperiodic distributed feedback grating was used as a multi-resonance filter.
  • The filter was embedded within a Fabry-Pérot (FP) THz quantum cascade laser (QCL) cavity.
  • Balancing feedback strengths of filter resonances and FP cavity for mode control.

Main Results:

  • Achieved purely electronic discrete tuning over 160 GHz with 30 GHz resolution for multi-moded QCLs (~2.9 THz).
  • Demonstrated dual-mode lasing with electrically controlled frequency separation from 190 to 267 GHz for QCLs with dual gain peaks (~2.65 and 2.9 THz).
  • Experimentally confirmed a phase-sensitive mode selection mechanism via divergent fine-tuning of lasing modes.

Conclusions:

  • The multi-resonance filter effectively enhances single-mode selectivity and enables precise electronic tuning in THz QCLs.
  • This approach facilitates controlled dual-mode lasing with tunable frequency separation.
  • The demonstrated phase-sensitive mechanism offers advanced control over THz laser output.