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High harmonic generation strongly depends on the driving laser field and as a result the harmonics have similar temporal and spatial coherence properties. [10] High harmonics are often generated with pulse durations shorter than that of the driving laser. [11] This is due to the nonlinearity of the generation process, phase matching and ...
For example, it was observed that in tin, there exists a very strong transition 4d 10 5s 2 5p 2 P 3/2 → 4d 9 5s 2 5p 2 (1 D) 2 D 5/2 at 26.27 eV and this transition has a high oscillator strength (gf value) of 1.52. [9] The energy of this transition corresponds to 17th harmonic with 800 nm excitation wavelength.
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 ...
This equation means that a charged particle in an inhomogeneous oscillating field not only oscillates at the frequency of ω of the field, but is also accelerated by F p toward the weak field direction. This is a rare case in which the direction of the force does not depend on whether the particle is positively or negatively charged.
N-th harmonic generation. Harmonic generation (HG, also called multiple harmonic generation) is a nonlinear optical process in which photons with the same frequency interact with a nonlinear material, are "combined", and generate a new photon with times the energy of the initial photons (equivalently, times the frequency and the wavelength divided by ).
In vibrational spectroscopy, an overtone band is the spectral band that occurs in a vibrational spectrum of a molecule when the molecule makes a transition from the ground state (v=0) to the second excited state (v=2), where v is the vibrational quantum number (a non-negative integer) obtained from solving the Schrödinger equation for the molecule.
These motional quanta can be understood in the same way as for the quantum harmonic oscillator. A ladder of levels will be available for each internal state of the atom. For example, in the figure at right both the ground (g) and excited (e) states have their own ladder of vibrational levels.