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Terahertz generation based on parametric conversion: from saturation of conversion efficiency to back conversion.

Yi Jiang1, Da Li, Yujie J Ding

  • 1Department of Electrical and Computer Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA.

Optics Letters
|May 5, 2011
PubMed
Summary
This summary is machine-generated.

Researchers achieved 40% photon conversion efficiency for terahertz generation using stacked gallium phosphide (GaP) plates. Increasing plates beyond four reduced terahertz output due to back conversion.

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Area of Science:

  • Solid-state physics
  • Optoelectronics
  • Photonics

Background:

  • Terahertz (THz) generation is crucial for various applications.
  • Difference-frequency generation (DFG) is a common THz generation method.
  • Gallium phosphide (GaP) is a promising material for nonlinear optical processes.

Purpose of the Study:

  • To optimize terahertz generation efficiency using stacked GaP plates.
  • To investigate the effect of plate stacking on THz output power.
  • To understand the limitations of DFG in GaP for THz generation.

Main Methods:

  • Stacking alternatively rotated gallium phosphide (GaP) plates.
  • Utilizing difference-frequency generation (DFG) for THz wave production.
  • Characterizing THz output power and photon conversion efficiency.

Main Results:

  • Achieved a maximum photon conversion efficiency of 40% for THz generation.
  • Generated a peak THz power of approximately 4 kW within four GaP plates.
  • Observed a significant decrease in THz output power when increasing plates from four to five.

Conclusions:

  • Optimized THz generation efficiency using stacked GaP plates.
  • Identified back parametric conversion as a limiting factor for increased plate numbers.
  • Demonstrated the potential of GaP DFG for high-power THz generation.