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All-optical adaptive control of quantum cascade random lasers.

S Schönhuber1,2, N Bachelard3, B Limbacher4,5

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We developed a new method to control terahertz (THz) light generation in quantum cascade lasers. This technique enables tunable, single-mode THz sources for advanced spectroscopy applications.

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Area of Science:

  • Quantum optics
  • Terahertz (THz) technology
  • Laser physics

Background:

  • Molecular spectral fingerprints are primarily in the THz and mid-infrared ranges.
  • Efficient molecular detection requires broadband coherent light sources in these frequencies.
  • Terahertz Quantum Cascade Lasers offer bandwidth but are limited by cavity geometry for tunability.

Purpose of the Study:

  • To introduce an adaptive control scheme for THz light generation in Quantum Cascade Random Lasers.
  • To reshape emission spectra by restructuring the active medium's permittivity.
  • To transform multi-mode THz lasers into tunable single-mode sources.

Main Methods:

  • Utilized an adaptive control scheme with a spatial light modulator and optimization procedure.
  • Applied a near-infrared (NIR) optical field to spatially pattern the THz emission.
  • Investigated local NIR illumination for sensing near-field interactions among modes.

Main Results:

  • Successfully transformed an initially multi-mode THz random laser into a tunable single-mode source.
  • Demonstrated reshaping of THz emission spectra via NIR optical field control.
  • Showcased the ability to spatially sense complex near-field interactions using local NIR illumination.

Conclusions:

  • The adaptive control scheme provides new degrees of freedom for THz light generation.
  • This approach enables the creation of broadly-tunable THz sources.
  • Potential applications include self-referenced spectroscopy and advanced molecular detection.