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Related Experiment Video

Updated: Jun 21, 2025

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

Wavelength modulation laser-induced fluorescence for plasma characterization.

I Romadanov¹, Y Raitses¹, A Smolyakov²

¹Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.

The Review of Scientific Instruments

|July 16, 2024

Summary

Wavelength Modulation Laser-Induced Fluorescence (WM-LIF) enhances sensitivity for measuring ion and atom velocity distributions in plasmas. This technique improves VDF analysis and noise reduction compared to standard methods.

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Last Updated: Jun 21, 2025

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Area of Science:

Plasma physics
Atomic and molecular physics
Spectroscopy

Background:

Laser-Induced Fluorescence (LIF) spectroscopy is crucial for plasma diagnostics.
Velocity Distribution Functions (VDFs) provide key kinetic information.
Interpreting VDFs is complex due to multicomponent distributions and background noise.

Purpose of the Study:

Investigate Wavelength Modulation (WM) LIF for enhanced VDF measurement sensitivity.
Compare WM-LIF with Amplitude Modulation (AM) LIF for VDF analysis.
Improve accuracy in plasma characterization using advanced LIF techniques.

Main Methods:

Developed a numerical model to simulate both WM and AM LIF signals.
Conducted experiments in a weakly collisional argon plasma.
Utilized a tunable diode laser and lock-in amplifier to detect the second harmonic WM signal.

Main Results:

WM-LIF shows increased sensitivity to VDF fitting parameters.
WM-LIF facilitates better identification of VDF components, temperatures, and velocities.
Demonstrated WM-LIF's effectiveness in noisy environments.

Conclusions:

WM-LIF offers superior sensitivity and accuracy for VDF measurements.
WM-LIF serves as a valuable tool for plasma characterization and validation of AM-LIF.
This technique is particularly advantageous in challenging plasma environments with background noise.