G. Bart
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High-harmonic generation in gases and solids Open
We present a quantum optical generalization of the quantum-matter Lewenstein model of high-harmonic generation (HHG) in gases that contains two channels corresponding to the inter and intraband HHG in solids. Both channels can be presented…
Quantum Dial for High-Harmonic Generation Open
High-harmonic generation (HHG) is a highly nonlinear optical process that typically requires an intense laser to trigger emissions at integer multiples of the driving field frequency. Since HHG is commonly used as a spectroscopic tool to p…
Quantum Dial for High-Harmonic Generation Open
High-harmonic generation (HHG) is a highly nonlinear optical process that typically requires an intense laser to trigger emissions at integer multiples of the driving field frequency. However, the strong fields required for conventional HH…
A unified perspective of high-harmonic generation in gases and solids Open
We present a quantum optical generalization of the quantum-matter Lewenstein model of high-harmonic generation (HHG) in gases that contains two channels corresponding to the inter- and intraband HHG in solids. Both channels can be presente…
Strong field physics in open quantum systems Open
Dephasing is the loss of phase coherence due to the interaction of an electron with the environment. The most common approach to model dephasing in light–matter interaction is the relaxation time approximation. Surprisingly, its use in int…
Simultaneous double ionization of C<sub>60</sub> molecules in single-cycle pulses Open
We theoretically investigate simultaneous double ionization of C 60 Buckminsterfullerene clusters within the strong field approximation, taking into account two-body effects like Coulomb blocking. Our analysis suggests that for infrared si…
Coulomb blocking of sequential tunnel ionization in complex systems Open
When atoms and molecules are exposed to intense low frequency laser fields, the dominant response is sequential tunnel ionization of charge states with increasing ionization potential. Sequential ionization is assumed to proceed as separat…
High harmonic generation tomography of impurities in solids: Conceptual analysis Open
A three step model for high harmonic generation from impurities in solids is\ndeveloped. The process is found to be similar to high harmonic generation in\natomic and molecular gases with the main difference coming from the\nnon-parabolic …
Measuring the Kerr nonlinearity via seeded Kerr instability amplification: conceptual analysis Open
Whereas the Kerr nonlinearity is well understood in the perturbative limit of nonlinear optics, there is considerable discussion about its functional form and magnitude at extreme intensities, at which point matter starts to ionize. Here, …
Theory of Kerr instability amplification Open
Evolution of lasers in Kerr nonlinear materials is inextricably linked with unstable behavior.Current research has investigated the growth of optical Kerr instability out of noise, which results in phenomena such as conical emission and fi…
Theory of Kerr Instability Amplification Open
A new amplification method based on the optical Kerr instability is suggested and theoretically analyzed, with emphasis on the near to mid-infrared wavelength regime. Our analysis for CaF2 and KBr crystals shows that one to two cycle pulse…