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Development of CO2 laser dispersion interferometer with photoelastic modulator
T Akiyama1, K Kawahata, S Okajima
1National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu 509-5292, Japan. takiyama@lhd.nifs.ac.jp
The Review of Scientific Instruments
|November 2, 2010
Summary
A new CO(2) laser dispersion interferometer uses a novel phase extraction method for accurate electron density measurement in fusion devices. This technique overcomes intensity variations, proving its feasibility in experiments.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Optical Diagnostics
Background:
- Electron density measurement is critical for large, high-density fusion devices.
- Dispersion interferometry offers a promising diagnostic approach.
- Conventional methods can be sensitive to intensity fluctuations.
Purpose of the Study:
- To develop a CO(2) laser dispersion interferometer for electron density measurements.
- To introduce a new phase extraction method to mitigate intensity variations.
- To demonstrate the feasibility of the developed system and method.
Main Methods:
- Development of a CO(2) laser dispersion interferometer.
- Integration of a photoelastic modulator for phase modulation.
- Implementation of a novel phase extraction technique using harmonic amplitude ratios.
Main Results:
- Successfully developed a CO(2) laser dispersion interferometer.
- Introduced and validated a new phase extraction method.
- Proof-of-principle experiments confirmed the method's ability to overcome intensity variations.
Conclusions:
- The developed CO(2) laser dispersion interferometer with the new phase extraction method is feasible.
- This technique enhances the reliability of electron density measurements in fusion devices.
- The method effectively addresses intensity variations in detected signals.
