Nearly stigmatic toroidal grazing-incidence spectrometer in the 100-300-A range: design

Area of Science:

• Optics and Photonics
• Plasma Physics
• Laser Technology

Background:

• Extreme ultraviolet (EUV) lasers are crucial for advanced research and applications.
• Diagnosing EUV laser amplifiers requires high-resolution spectroscopic instruments.
• Current diagnostic tools may have limitations in resolution and imaging capabilities for EUV sources.

Purpose of the Study:

• To present an initial design study for a novel single-element aberration-corrected holographic toroidal spectrometer.
• To enable high-precision, two-dimensional imaging for diagnosing EUV laser amplifiers.
• To support the tabletop extreme ultraviolet laser project at MIT.

Main Methods:

• Design and simulation of a 7-meter long holographic toroidal spectrometer.
• Utilizing a 450-line/mm holographic grating with an 80-degree incidence angle.
• Incorporating aberration correction for near-stigmatic imaging.

Main Results:

• The spectrometer is designed to be nearly stigmatic between 100 and 300 Angstroms.
• Achieves two-dimensional imaging capability with a 10-micrometer spatial resolution.
• Theoretical spectral resolution (lambda/Deltalambda) approaches 5000 at zero slit width.

Conclusions:

• The proposed spectrometer design is suitable for high-resolution diagnostics of EUV laser amplifiers.
• The instrument's capabilities support advanced EUV laser research, particularly for tabletop systems.
• This design advances the development of sophisticated tools for EUV spectroscopy and imaging.