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THz Generation by Two-Color Plasma: Time Shaping and Ultra-Broadband Polarimetry.

Domenico Paparo1,2, Anna Martinez1,2,3, Andrea Rubano1,2

  • 1ISASI-Institute of Applied Sciences and Intelligent Systems, Consiglio Nazionale delle Ricerche, via Campi Flegrei 34, 80078 Pozzuoli, Italy.

Sensors (Basel, Switzerland)
|July 13, 2024
PubMed
Summary
This summary is machine-generated.

Researchers control terahertz pulse shapes and polarity using laser chirp and phase manipulation. A new polarimetry technique accurately measures terahertz polarization states, improving applications in optics and spectroscopy.

Keywords:
THz generation by two-color plasmaTHz vector beamsphotocurrent modelsecond-harmonic generation in airultra-broadband THz polarimetry

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Area of Science:

  • Optics and Photonics
  • Plasma Physics
  • Quantum Electronics

Background:

  • Laser-induced plasma generation of terahertz (THz) radiation using two-color femtosecond pulses is a well-established technique.
  • Significant challenges remain in precisely controlling the temporal characteristics and measuring the polarization state of these ultra-broadband THz pulses.

Purpose of the Study:

  • To investigate the influence of laser chirp and phase difference on THz pulse generation.
  • To introduce and validate a novel method for THz polarization characterization.
  • To enhance the control and measurement capabilities for THz radiation.

Main Methods:

  • Investigated the effect of fundamental wave chirping on THz pulse properties.
  • Manipulated the phase difference between fundamental and second-harmonic waves.
  • Developed and applied terahertz unipolar polarimetry using a weak probe beam for polarization measurement.

Main Results:

  • Demonstrated tunable temporal shaping of THz pulses, including polarity reversal and bipolarization, via chirp and phase control.
  • Introduced terahertz unipolar polarimetry, a novel technique for accurate polarization characterization.
  • Validated the new method for detecting polarization-structured and longitudinal THz beams, avoiding systematic errors of traditional methods.

Conclusions:

  • Precise control over THz pulse temporal shapes is achievable through laser parameter manipulation.
  • Terahertz unipolar polarimetry offers a robust and accurate method for characterizing THz polarization states.
  • These advancements facilitate improved applications of THz radiation in nonlinear optics, spectroscopy, and microscopy.