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Implementation of a Wollaston interferometry diagnostic on OMEGA EP
A Howard1, D Haberberger1, R Boni1
1Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.
A novel Wollaston interferometer effectively measures electron density in laser-produced plasma plumes. This diagnostic offers adjustable fringe spacing for precise plasma characterization.
Area of Science:
- Plasma Physics
- Laser-Induced Plasmas
- Optical Diagnostics
Background:
- Experiments on the OMEGA EP laser system generate plasma plumes.
- Measuring electron density in these plasmas is crucial for understanding experimental outcomes.
- Existing diagnostics may have limitations in resolution or flexibility.
Purpose of the Study:
- To present a new Wollaston interferometer design for measuring plasma plume electron density.
- To demonstrate the diagnostic's unique configuration and capabilities.
- To characterize plasma density within a specific range.
Main Methods:
- Utilizing a Wollaston prism to split a 263 nm laser probe beam into two.
- Integrating the interferometer into the 4ω probe system with an f/4 imaging system.
- Implementing a unique configuration allowing independent adjustment of fringe spacing (17-76 μm/fringe).
Main Results:
- The diagnostic achieves a field of view of approximately 1.2 × 1.6 mm at target chamber center.
- High imaging resolution of 5 μm is maintained.
- Accurate plasma density characterization achieved for densities ranging from 3 × 10^18 to 1 × 10^20 cm^-3.
Conclusions:
- The developed Wollaston interferometer is a valuable tool for plasma diagnostics.
- The independent control over fringe spacing offers enhanced flexibility.
- This diagnostic enables precise electron density measurements in laser-produced plasmas.
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