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Grating configurations to compress free-electron laser pulses
Luca Poletto1, Fabio Frassetto1
1National Research Council - Institute of Photonics and Nanotechnologies, via Trasea 7, Padova 35136, Italy.
Journal of Synchrotron Radiation
|December 23, 2017
Summary
This study discusses optical layouts for soft X-ray grating compressors, enabling both positive and negative group-delay dispersion (GDD) for seeded free-electron laser experiments. Designs utilize plane or concave gratings to control GDD, optimizing chirped-pulse amplification.
Area of Science:
- Optics
- X-ray physics
- Laser technology
Background:
- Soft X-ray grating compressors are crucial for manipulating ultrashort laser pulses.
- Chirped-pulse amplification (CPA) requires precise control over pulse dispersion.
- Seeded free-electron laser (FEL) sources produce high-intensity ultrashort X-ray pulses.
Purpose of the Study:
- To present optical layouts for soft X-ray grating compressors.
- To enable both positive and negative group-delay dispersion (GDD).
- To tailor compressor designs for seeded FEL CPA experiments.
Main Methods:
- Discussion of optical layouts for grating compressors.
- Analysis of designs using plane gratings.
- Analysis of designs using concave gratings.
Main Results:
- Demonstration of compressor designs for positive GDD.
- Demonstration of compressor designs for negative GDD.
- Tailoring of designs based on the required GDD sign.
Conclusions:
- Soft X-ray grating compressors can be designed for both positive and negative GDD.
- The choice between plane and concave gratings depends on the desired GDD.
- These designs are suitable for advanced seeded FEL CPA applications.
