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Degenerate phase-matching for multi-wavelength nonlinear mixing in aperiodic lattice lasers
Optics Letters
|December 24, 2024
Summary
Aperiodic lattices in terahertz lasers enable tunable multi-frequency emission. Nonlinear frequency generation is enhanced by engineering photon lifetimes and refractive indices for improved terahertz-over-fiber communication.
Area of Science:
- Terahertz (THz) photonics
- Nonlinear optics
- Semiconductor laser engineering
Background:
- Holographically designed aperiodic lattices (ALs) enable electrically switchable terahertz (THz) lasers.
- Integrated THz laser cavities support nonlinear frequency generation.
Purpose of the Study:
- Investigate multi-wavelength nonlinear frequency generation in THz laser cavities with ALs.
- Analyze the role of ALs in engineering photon lifetimes and refractive indices.
- Explore potential applications in THz-over-fiber communication systems.
Main Methods:
- Nonlinear transfer matrix modeling.
- Simulation of nonlinear (sum- or difference-) frequency generation.
- Analysis of aperiodic lattice properties (photon lifetime, effective refractive index).
Main Results:
- Nonlinear conversion efficiency shows resonant enhancement at idler frequencies with high photon lifetimes.
- Resonant phase-matching is directly linked to engineered effective index dispersion.
- Degenerate phase-matched pump frequencies observed for lowest threshold, multi-wavelength defect modes.
Conclusions:
- Aperiodic lattices offer precise control over nonlinear frequency generation in THz lasers.
- Engineered photon lifetimes and refractive indices are key to efficient THz emission.
- Findings support advancements in wavelength multiplexing for THz communication.
