Stimulated scattering and harmonic generation from relativistically intense laser light in plasma

2003 ◽  
Vol 10 (4) ◽  
pp. 1135-1145 ◽  
Author(s):  
H. C. Barr ◽  
L. J. Hill
Keyword(s):  
Harmonic Generation ◽  
Laser Light ◽  
Intense Laser ◽  
Stimulated Scattering

scholarly journals Quantum-Optical Spectrometry in Relativistic Laser–Plasma Interactions Using the High-Harmonic Generation Process: A Proposal

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 192
Author(s):  
Theocharis Lamprou ◽  
Rodrigo Lopez-Martens ◽  
Stefan Haessler ◽  
Ioannis Liontos ◽  
Subhendu Kahaly ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Quantum Electrodynamics ◽  
Laser Field ◽  
High Harmonic ◽  
Intense Laser ◽  
Strong Laser Field ◽  
Laser Plasma Interactions ◽  
Strong Laser ◽  
Optical Spectrometry ◽  
Quantum Optical

Quantum-optical spectrometry is a recently developed shot-to-shot photon correlation-based method, namely using a quantum spectrometer (QS), that has been used to reveal the quantum optical nature of intense laser–matter interactions and connect the research domains of quantum optics (QO) and strong laser-field physics (SLFP). The method provides the probability of absorbing photons from a driving laser field towards the generation of a strong laser–field interaction product, such as high-order harmonics. In this case, the harmonic spectrum is reflected in the photon number distribution of the infrared (IR) driving field after its interaction with the high harmonic generation medium. The method was implemented in non-relativistic interactions using high harmonics produced by the interaction of strong laser pulses with atoms and semiconductors. Very recently, it was used for the generation of non-classical light states in intense laser–atom interaction, building the basis for studies of quantum electrodynamics in strong laser-field physics and the development of a new class of non-classical light sources for applications in quantum technology. Here, after a brief introduction of the QS method, we will discuss how the QS can be applied in relativistic laser–plasma interactions and become the driving factor for initiating investigations on relativistic quantum electrodynamics.

Coupled Dynamics of Electrons and Nuclei in a Molecule Interacting with Ultrashort, Ultra-Intense Laser Pulses

1997 ◽  
Vol 491 ◽  
Author(s):  
S. Khosravi ◽  
R. E. Allen
Keyword(s):  
Harmonic Generation ◽  
Laser Pulses ◽  
Intense Laser ◽  
Electronic Transitions ◽  
Coupled Dynamics ◽  
Electron Population ◽  
Intense Laser Pulses ◽  
Bond Softening ◽  
Population Trapping

ABSTRACTWe have developed a technique for treating the coupled dynamics of electrons and nuclei in a molecule which is subjected to ultrashort and ultra-intense laser pulses. This technique has been employed in quantitatively accurate simulations for . Many interesting phenomena have been observed, including photodissociation, bond softening, above-threshold dissociation, ion-population trapping, electron-population trapping, sudden electronic transitions, Rabi flopping, and harmonic generation. Some representative results are shown here.

NONLINEAR MAGNETO-OPTICAL EFFECT IN VACUUM: INHOMOGENEITY-ORIGINATED SECOND-HARMONIC GENERATION IN DC MAGNETIC FIELD

1992 ◽  
Vol 01 (01) ◽  
pp. 51-72 ◽  
Author(s):  
Y.J. DING ◽  
A.E. KAPLAN
Keyword(s):  
Magnetic Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Quantum Electrodynamics ◽  
Second Harmonic ◽  
Intense Laser ◽  
Gaussian Laser Beam ◽  
Optical Wave ◽  
Dc Magnetic Field ◽  
Magneto Optical Effect

The photon-photon scattering predicted by quantum electrodynamics can give rise to second-harmonic generation of intense laser radiation in a dc magnetic field due to broken symmetry of interaction even in the “box” diagram approximation. This effect is possible only when the field system (i.e. optical wave+dc field) is inhomogeneous, in particular when a Gaussian laser beam (i.e. nonplane wave) propagates in either homogeneous or inhomogeneous dc magnetic field.

scholarly journals High-order Harmonic Generation from Hydrogen Molecular Ion in Coherent Superposition State

2020 ◽  
Vol 30 (2) ◽  
pp. 99
Author(s):  
Ngoc-Loan Phan
Keyword(s):  
Harmonic Generation ◽  
Ground State ◽  
Interference Effect ◽  
High Order ◽  
Intense Laser ◽  
Superposition State ◽  
High Order Harmonic Generation ◽  
Coherent Superposition ◽  
High Order Harmonic ◽  
Depletion Effect

Atom in a coherent superposition state reveals an advantage in the enhancement conversion efficiency of high-order harmonic generation (HHG), which is meaningful in producing attosecond pulses. In this study, we expand to investigate a more complicated system, H\(_2^+\) molecule in the superposition of the ground and second excited states, exposed to an ultrashort intense laser pulse by numerically solving the time-dependent Schrödinger equation. Firstly, we examine the enhancement of HHG from this system. Then, we study the depletion effect on the cutoff energy of HHG spectra with the coherent superposition state. We found that these effects on the HHG from molecules are similar to those from atoms. Finally, we study the signature of the interesting effect, which is absent for atoms -- two-center interference effect in the HHG from H\(_2^+\) in the coherent superposition state. We recognize that the minimum positions in HHG from molecules in the superposition state, and in the pure ground state are the same. Especially, for weak laser intensity, in the HHG with the superposition state, the minimum due to the interference effect is apparent, while it is invisible in the HHG from pure ground state. As a result, in comparison with the ground-state molecule, the coherent molecule can be used as a more accurate tool to determine the internuclear distance of molecule.

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