XUV frequency comb production with an astigmatism-compensated enhancement cavity
| Autor: | J. Nauta, J. R. Crespo López-Urrutia, Jan-Hendrik Oelmann, Thomas Pfeifer, P. Knauer, Alexander Ackermann, I. S. Muhammad, R. Pappenberger, A. Borodin |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Jet (fluid) business.industry Parabolic reflector Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Metrology 010309 optics Frequency comb Optics Extreme ultraviolet Harmonics 0103 physical sciences Femtosecond Vacuum chamber 0210 nano-technology business |
| Zdroj: | Optics Express |
| Popis: | We have developed an extreme ultraviolet (XUV) frequency comb for performing ultra-high precision spectroscopy on the many XUV transitions found in highly charged ions (HCI). Femtosecond pulses from a 100 MHz phase-stabilized near-infrared frequency comb are amplified and then fed into a femtosecond enhancement cavity (fsEC) inside an ultra-high vacuum chamber. The low-dispersion fsEC coherently superposes several hundred incident pulses and, with a single cylindrical optical element, fully compensates astigmatism at the w0 = 15 µm waist cavity focus. With a gas jet installed there, intensities reaching ∼ 1014 W/cm2 generate coherent high harmonics with a comb spectrum at 100 MHz rate. We couple out of the fsEC harmonics from the 7th up to the 35th (42 eV; 30 nm) to be used in upcoming experiments on HCI frequency metrology. |
| Databáze: | OpenAIRE |
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