Related Experiment Video
Updated: Jun 7, 2026
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Development of two color laser diagnostics for the ITER poloidal polarimeter
K Kawahata1, T Akiyama, K Tanaka
1National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-529, Japan. kawahata@lhd.nifs.ac.jp
The Review of Scientific Instruments
|November 2, 2010
Summary
Two-color laser diagnostics using terahertz sources are advancing for fusion devices like ITER. A twin optically pumped laser achieved simultaneous 57.2 and 47.7 μm oscillations, compensating for vibrations.
Area of Science:
- Plasma physics
- Fusion energy research
- Laser diagnostics
Background:
- High-performance operation of fusion devices like the Large Helical Device (LHD) requires advanced diagnostic tools.
- Future fusion reactors, including ITER (International Thermonuclear Experimental Reactor), necessitate robust and precise measurement techniques.
Purpose of the Study:
- To develop and apply two-color laser diagnostics for high-performance operation of the LHD and future fusion devices.
- To describe the application of these diagnostics to the ITER poloidal polarimeter and recent hardware advancements.
Main Methods:
- Utilizing terahertz laser sources for diagnostic measurements.
- Employing a twin optically pumped methyl deuteride (CH3OD) laser system.
- Developing a two-color laser interferometer capable of compensating for mechanical vibrations.
Main Results:
- Achieved simultaneous high-power laser oscillation at 57.2 μm and 47.7 μm wavelengths.
- Confirmed the functional capability of the two-color laser interferometer in compensating for mechanical vibrations.
Conclusions:
- The developed two-color laser diagnostics show promise for advanced fusion research.
- The technology is suitable for application in complex diagnostic systems like the ITER poloidal polarimeter.
