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Self-Induced Mode-Locking in Electrically Pumped Far-Infrared Random Lasers.

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  • 1NEST, CNR - Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, 56127, Italy.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 27, 2023
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Researchers achieved mode-locking in terahertz random lasers by combining semiconductor lasers and graphene. This breakthrough enables new applications in spectroscopy and quantum computing.

Keywords:
graphenerandom lasersterahertz

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Area of Science:

  • Terahertz (THz) photonics
  • Disordered systems physics
  • Nonlinear optics

Background:

  • Mode-locking is crucial for generating ultrashort laser pulses.
  • Random lasers, lacking cavities, can exhibit mode-locking via nonlinear coupling.
  • Semiconductor heterostructure lasers possess giant third-order nonlinear susceptibility (χ(3)).

Purpose of the Study:

  • Demonstrate mode-locking in surface-emitting, electrically pumped random quantum cascade lasers (QCLs) at terahertz frequencies.
  • Utilize the nonlinear properties of graphene in conjunction with semiconductor lasers.
  • Explore novel light sources for advanced applications.

Main Methods:

  • Integration of graphene with semiconductor heterostructure lasers.
  • Fabrication techniques including lithographic patterning of graphene for light scattering.
  • Coupling a saturable absorber graphene reflector on-chip.
  • Utilizing intermode beatnote mapping and self-mixing intermode spectroscopy.

Main Results:

  • Successful demonstration of mode-locking in electrically pumped terahertz random QCLs.
  • Evidence of self-induced phase-coherence between naturally incoherent random modes.
  • Confirmation of phase-locked random modes through spectroscopy.

Conclusions:

  • This work represents a significant advancement in the physics of disordered systems.
  • Paves the way for miniaturized, electrically pumped mode-locked terahertz sources.
  • Enables applications in broadband spectroscopy, multicolor speckle-free imaging, and reservoir quantum computing.