Vacuum high-harmonic generation and electromagnetic shock

Field-gradient-induced second-harmonic generation in magnetized vacuum

The photon-photon scattering in vacuum can give rise to the second-harmonic generation of intense laser radiation in a dc magnetic field in the ‘‘box’’ diagram approximation of quantum electrodynamics if the symmetry of interaction is broken by modulation or/and nonuniformity of optical wave 1dc field system in time or/and space. Specific examples considered here are: an optical pulse plane wav...

Generation and control of high-harmonic radiation

Extreme Nonlinear Optics (high harmonic generation and attosecond generation)

This method relies on the possibility of FourierSynthesis of discrete lines over a broad spectrum (similar to mode-locking). A Raman medium is characterized by its Raman frequency ω0, which can be the difference between two rotational or vibrational lines. When we apply a laser excitation ωL − ωs close to ω0, we can obtain gain at the stokes (ωL−nω0) and anti-stokes (ωL+nω0) frequencies, the Ra...

Attochirp-free high-order harmonic generation.

A method is proposed for arbitrarily engineering the high-order harmonic generation phase achieved by shaping a laser pulse and employing xuv light or x rays for ionization. This renders the production of bandwidth-limited attosecond pulses possible while avoiding the use of filters for chirp compensation. By adding the first 8 Fourier components to a sinusoidal field of 1016 W/cm2, the bandwid...

High-gain Harmonic-generation Free-electron Laser

A high-gain harmonic-generation free-electron laser is demonstrated. Our approach uses a laser-seeded free-electron laser to produce amplified, longitudinally coherent, Fourier transform-limited output at a harmonic of the seed laser. A seed carbon dioxide laser at a wavelength of 10.6 micrometers produced saturated, amplified free-etectron laser output at the second-harmonic wavelength, 5.3 mi...