Title |
Bright Coherent Ultrahigh Harmonics in the keV X-ray Regime from Mid-Infrared Femtosecond Lasers
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Published in |
Science, June 2012
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DOI | 10.1126/science.1218497 |
Pubmed ID | |
Authors |
Tenio Popmintchev, Ming-Chang Chen, Dimitar Popmintchev, Paul Arpin, Susannah Brown, Skirmantas Ališauskas, Giedrius Andriukaitis, Tadas Balčiunas, Oliver D. Mücke, Audrius Pugzlys, Andrius Baltuška, Bonggu Shim, Samuel E. Schrauth, Alexander Gaeta, Carlos Hernández-García, Luis Plaja, Andreas Becker, Agnieszka Jaron-Becker, Margaret M. Murnane, Henry C. Kapteyn |
Abstract |
High-harmonic generation (HHG) traditionally combines ~100 near-infrared laser photons to generate bright, phase-matched, extreme ultraviolet beams when the emission from many atoms adds constructively. Here, we show that by guiding a mid-infrared femtosecond laser in a high-pressure gas, ultrahigh harmonics can be generated, up to orders greater than 5000, that emerge as a bright supercontinuum that spans the entire electromagnetic spectrum from the ultraviolet to more than 1.6 kilo-electron volts, allowing, in principle, the generation of pulses as short as 2.5 attoseconds. The multiatmosphere gas pressures required for bright, phase-matched emission also support laser beam self-confinement, further enhancing the x-ray yield. Finally, the x-ray beam exhibits high spatial coherence, even though at high gas density the recolliding electrons responsible for HHG encounter other atoms during the emission process. |
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Unknown | 4 | 36% |
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Geographical breakdown
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Japan | 5 | <1% |
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France | 2 | <1% |
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Researcher | 203 | 24% |
Student > Master | 81 | 10% |
Student > Doctoral Student | 44 | 5% |
Student > Bachelor | 39 | 5% |
Other | 110 | 13% |
Unknown | 115 | 14% |
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