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Efficient low-density grating setup for monochromatization of XUV ultrafast light sources
Optics Express
|March 2, 2023
Summary
Selecting specific light harmonics from ultrafast sources is crucial for material science. A normal-incidence grating offers higher transmission and minimal pulse broadening compared to mirrors and filters, simplifying harmonic selection.
Area of Science:
- Ultrafast science
- Material science
- Quantum optics
Background:
- Ultrafast light sources are essential for studying transient phenomena.
- Efficient and simple harmonic selection from high harmonic generation (HHG) sources remains a challenge.
Purpose of the Study:
- To compare two methods for selecting specific harmonics from HHG sources.
- To evaluate transmission efficiency, pulse duration, and focusing quality for each method.
Main Methods:
- Comparison of extreme ultraviolet (XUV) spherical mirrors with transmission filters.
- Evaluation of a normal-incidence spherical grating for harmonic selection.
- Characterization of focusing quality, photon flux, and temporal broadening.
Main Results:
- The normal-incidence grating achieved significantly higher photon flux (3.3x at 10.8 eV, 12.9x at 18.1 eV) compared to the mirror+filter approach.
- The grating method introduced only a slight temporal broadening (6.8%) and a moderate increase in spot size (~30%).
Conclusions:
- A normal-incidence grating provides a more efficient harmonic selection method than mirrors and filters for XUV light.
- This study offers experimental insights into the trade-offs for selecting HHG, aiding researchers in choosing optimal setups.
