A new method for determining the plasma electron density using optical frequency comb interferometer.

Area of Science:

• Plasma physics
• Optical interferometry
• Laser diagnostics

Background:

• Accurate plasma electron density measurement is crucial for understanding plasma behavior.
• Traditional interferometric methods can suffer from fringe counting errors, especially at high densities.
• Optical frequency comb lasers offer unique properties for advanced measurement techniques.

Purpose of the Study:

• To propose a new method for plasma electron density measurement.
• To leverage optical frequency comb interferometry for enhanced measurement accuracy.
• To overcome limitations of existing diagnostic techniques in high-density plasma environments.

Main Methods:

• Utilizing interferometric phases (fractional fringes) from an optical frequency comb interferometer.
• Employing the specific characteristics of optical frequency comb lasers for measurement.
• Conducting simulations to validate the proposed method's performance.

Main Results:

• The proposed method enables high-density plasma electron density measurement.
• Fringe counting errors are eliminated by using fractional fringes and comb characteristics.
• Simulations confirm that short wavelength, wide wavelength range, and low noise reduce density ambiguity.

Conclusions:

• Optical frequency comb interferometry provides a robust approach for plasma electron density diagnostics.
• The technique offers improved accuracy and resolution in high-density plasmas.
• Further research can explore experimental implementation and optimization of this method.