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Related Experiment Video

Updated: Aug 9, 2025

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

Direct time-resolved plasma characterization with broadband terahertz light pulses.

Virgilijus Vaičaitis¹, Ona Balachninaitė¹, Aidas Matijošius¹

¹Laser Research Center, Vilnius University, Saulėtekio 10, Vilnius LT-10223, Lithuania.

Physical Review. E

|February 17, 2023

Summary

This study introduces a new method using terahertz (THz) pulses to analyze plasma properties like density and electron temperature. This technique offers a direct and precise way to study laser-induced plasmas.

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Last Updated: Aug 9, 2025

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Area of Science:

Plasma Physics
Spectroscopy
Ultrafast Science

Background:

Accurate characterization of laser-induced plasmas is crucial for understanding various physical phenomena.
Traditional plasma diagnostics can be complex and may not offer single-shot, high-dynamic-range measurements.

Purpose of the Study:

To develop and demonstrate a novel diagnostic technique for comprehensive plasma characterization.
To enable in situ, real-time measurement of key plasma parameters using time-resolved terahertz (THz) absorption spectroscopy.

Main Methods:

Propagation of ultrabroadband (0.1-50 THz) THz pulses through a laser-created plasma.
Analysis of the time-resolved absorption spectra of the transmitted THz pulses.
Application of spectral analysis to determine plasma density, electron temperature, and expansion dynamics.

Main Results:

Demonstrated proof-of-principle for THz absorption spectroscopy as a plasma diagnostic tool.
Reliably measured plasma densities in the range of 10^16 to 10^20 cm^-3.
Successfully reconstructed peak intensity within the plasma and observed early plasma evolution stages.

Conclusions:

THz absorption spectroscopy provides a direct, in situ, and high-dynamic-range method for plasma characterization.
This technique offers potential for single-shot measurements of plasma parameters.
The method is effective for studying laser-induced plasmas and their early dynamics.