AI Article Synopsis
- High-order harmonic generation (HHG) creates a wide spectrum of light from the vacuum ultraviolet to extreme ultraviolet range, making it ideal for detailed material analysis.
- The study presents a high-photon flux HHG source using a two-color laser field, achieving a photon output of 2 × 10^12 phs/s at 21.6 eV.
- A classical diffraction mounted grating monochromator was developed to cover photon energies from 12 to 40.8 eV, enhancing time resolution by minimizing pulse front tilt and addressing energy resolution broadening due to space charge effects.
Article Abstract
High-order harmonic generation (HHG) has a broad spectrum covering vacuum ultraviolet to extreme ultraviolet (XUV) bands, which is useful for applications involving material analyses at different information depths. Such an HHG light source is perfect for time- and angle-resolved photoemission spectroscopy. Here, we demonstrate a high-photon flux HHG source driven by a two-color field. Applying a fused silica compression stage to reduce the driving pulse width, we obtained a high XUV photon flux of 2 × 10 phs/s @21.6 eV on target. We designed a classical diffraction mounted (CDM) grating monochromator that can achieve a wide range of photon energy from 12 to 40.8 eV, while the time resolution is improved by reducing the pulse front tilt after the harmonic selection. We designed a spatial filtering method to adjust the time resolution using the CDM monochromator and significantly reduced the pulse front tilt of the XUV pulses. We also demonstrate a detailed prediction of the energy resolution broadening which is caused by the space charge effect.
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| http://dx.doi.org/10.1364/OE.484088 | DOI Listing |
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