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Showing 1 to 9 of 9 for “"high harmonics"”.
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Extreme ultraviolet polarization optics for polarimetry of structured high harmonics
High Harmonic Generation (HHG) is a leading way to generate table-top coherent extreme ultraviolet (EUV) and attosecond pulses. Polarization characterization in this spectral range is important to understand the phenomena of HHG and quantify the light used for experiments. Furthermore, polarization …
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High harmonic generation by short laser pulses: time-frequency behavior and applications to attophysics
High harmonic generation (HHG) is a process in which noble gas atoms excited by an intense laser field at frequency ω<sub>1</sub> emit radiation of higher frequencies that are odd integer multiples of ω<sub>1</sub>. Driven by an infrared laser, high harmonic radiation can span from the optical into …
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Extreme Ultraviolet Polarimetry with Laser-Generated High-Order Harmonics
… (EUV) polarimeter, which employs laser-generated high-order harmonics as the light source. This relatively high-flux directional EUV source has available wavelengths between 8 nm and 62 nm and easily rotatable linear polarization. The polarimeter will aid researchers at BYU in characterizing EUV …
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Controlling Laser High-Order Harmonic Generation Using Weak Counter-Propagating Light
Laser high-order harmonic generation in the presence of relatively weak interfering light is investigated. The interfering pulses intersect the primary harmonic-generating laser pulse at the laser focus. The interfering light creates a standing intensity and phase modulation on the field, which …
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Phase-Matching Optimization of Laser High-Order Harmonics Generated in a Gas Cell
… nm bandwidth) laser pulses are used to study high-order harmonic generation in helium- and neon-filled gas cells of various lengths. Harmonic orders in the range of 50 to 100 are investigated. A semi-infinite cell geometry produces brighter harmonics than cells of sub-centimeter length. In the …
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Harmonic and Supercontinuum Generation in Zinc-Blende Materials
… symmetry of the medium and the generation of high harmonics is illustrated.
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Table-top XUV nanoscope
… imaging. Such radiation can be produced via high harmonic generation (HHG) by focusing a highly intense ultrashort laser pulse into gas. In order to obtain high flux XUV radiation suitable for CDI, various generation conditions are explored. By observing the fluorescence from an argon gas jet …
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Direct Observation of Laser Filamentation in High-Order Harmonic Generation
… of an intense laser pulse as it generates high-order harmonics in a long gas cell, filled with 80 torr of helium. A thin foil separates the gas-filled region of the cell from a subsequent evacuated region. The exit plane of the gas cell can be scanned along the laser axis so that the …
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The binary system containing the pulsar PSR 1913+16 and ultra-violet and x-radiation from accreting magnetic white dwarfs
… and accretion rates. At low magnetic fields and high accretion rates, bremsstrahlung is the dominant cooling mechanism and the post-shock material is a single fluid (the electrons and :ions have a common temperature). As the magnetic fit-hd increases or the accretion rate decreases, cyclotron …