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High harmonics have a number of interesting properties. They are a tunable table-top source of XUV/soft X-rays, synchronised with the driving laser and produced with the same repetition rate. The harmonic cut-off varies linearly with increasing laser intensity up until the saturation intensity I sat where harmonic generation stops. [9]
Similarly, in Indium, there exists a strong transition 4d 10 5s 2 → 4d 9 5s 2 5p at 19.92 eV with a high gf value of 1.11. [10] The energy of this transition corresponds to 13th harmonic with 800 nm excitation wavelength. This enhancement in a particular harmonic order is most commonly known as Resonant High Harmonic Generation (RH).
High harmonic generation (HHG) is a nonlinear process where intense laser radiation is converted from one fixed frequency to high harmonics of that frequency by ionization and recollision of an electron. It was first observed in 1987 by McPherson et al. who successfully generated harmonic emission up to the 17th order at 248 nm in neon gas. [3]
High harmonic generation in krypton.This technology is one of the most used techniques to generate attosecond bursts of light. Attosecond physics, also known as attophysics, or more generally attosecond science, is a branch of physics that deals with light-matter interaction phenomena wherein attosecond (10 −18 s) photon pulses are used to unravel dynamical processes in matter with ...
Reconstruction of attosecond beating by interference of two-photon transitions, more commonly known as RABBITT or RABBIT for short, is a widely used technique for obtaining the relative phase and amplitude of attosecond pulses.
She develops ultrafast techniques (X-ray and Terahertz time-domain spectroscopy) to understand biomolecules and materials. [1] Based on table-top harmonic generation, she has created new sources for ultrashort (attosecond) pulses for transient absorption spectroscopy that are in the soft X-ray range. [2] She uses table-top high harmonic generation.
EUV is naturally generated by the solar corona and artificially by plasma, high harmonic generation sources and synchrotron light sources. Since UVC extends to 100 nm, there is some overlap in the terms. The main uses of extreme ultraviolet radiation are photoelectron spectroscopy, solar imaging, and lithography.
Eleftherios Goulielmakis (Ελευθέριος Γουλιελμάκης) is a Greek physicist specializing in lasers.He is a professor of physics at the University of Rostock, Germany where he currently leads the research activities of the Extreme Photonics group.