Ellipticity dependence of atomic and molecular high harmonic generation

Flettner, A.; König, Joachim; Mason, M. B.; Pfeifer, Thomas; Weichmann, Ulrich; Düren, R.; Gerber, G.

doi:10.1140/epjd/e2002-00174-3

Cited by 25 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This circumstance essentially differs molecules from atoms in the course of their interaction with a strong laser field and causes the dependence of the efficiency of high-harmonic generation in molecular gases on the geometry of molecules. In particular, the larger extension of molecular systems in comparison with atoms can explain the weaker dependence of the efficiency of high-harmonic generation on the ellipticity of incident radiation in molecular gases (N 2 ) as compared with atomic ones (Ar), which was observed in experiments [32,33].…”

Section: Molecular Sizes and Configurationmentioning

confidence: 99%

Possibilities for controlling attosecond x-ray pulse generation during molecular ionization by femtosecond laser radiation

Emelin

Ryabikin

Sergeev

2004

Radiophys Quantum Electron

View full text Add to dashboard Cite

UDC 539.19We discuss the role of different factors (molecular sizes and configuration, orientation of the molecular axis with respect to the electric field of a laser pulse, the type of the molecular orbital, etc.), which characterize molecules and their state, in the formation of the nonlinear response of a molecule ionized by a high-power femtosecond laser pulse. In numerical experiments within the framework of a two-dimensional model for the H + 2 molecular ion, we study possibilities for controlling the process of nonlinear frequency conversion of femtosecond optical radiation into Xray radiation of attosecond duration by means of preliminary vibrational or electronic excitation of molecules. We demonstrate the possibilities of using the attosecond pulse generation as a diagnostic tool for probing vibration-rotational dynamics of molecules.

show abstract

Section: Molecular Sizes and Configurationmentioning

confidence: 99%

Possibilities for controlling attosecond x-ray pulse generation during molecular ionization by femtosecond laser radiation

Emelin

Ryabikin

Sergeev

2004

Radiophys Quantum Electron

View full text Add to dashboard Cite

show abstract

“…In the last two decades, extensive theoretical and experimental work have been done on high harmonic generation ͑HHG͒ in atoms, such as H, He, and rare gases [1][2][3][4][5][6][7][8][9][10][11] and molecules, such as H 2 , N 2 , and O 2 . 3,6,9,[12][13][14][15][16] Apart from fundamental aspects, HHG is very important in the production of coherent radiation in the extreme ultraviolet ͑XUV͒ or soft x-ray regime from low-frequency lasers.…”

Section: Introductionmentioning

confidence: 99%

“…3,6,9,[12][13][14][15][16] Apart from fundamental aspects, HHG is very important in the production of coherent radiation in the extreme ultraviolet ͑XUV͒ or soft x-ray regime from low-frequency lasers. Very high energy attosecond ͑as͒ pulse 17,18 in the XUV or x-ray range is also generated using HHG.…”

Section: Introductionmentioning

confidence: 99%

A time-independent Hermitian Floquet approach for high harmonic generation in H2+ and HD+: Effect of nonadiabatic interaction in HD+

Sarkar

Bhattacharyya

Saha

2010

The Journal of Chemical Physics

View full text Add to dashboard Cite

We have theoretically investigated the high harmonic generation (HHG) in H(2)(+) and HD(+) using a time-independent Hermitian nonperturbative three-dimensional Floquet approach for continuous wave monochromatic lasers of intensities of 2.59x10(13), 4.0x10(13), and 5.6x10(13) W/cm(2), and wavelengths of 1064, 532, and 355 nm. For the moderate intensities and the wavelengths used, the Keldysh parameter gamma > 1 and no tunnel ionization occurs. We have endeavored to explain the dynamics of HHG in H(2)(+) and HD(+) within the framework of transitions due to electronic as well as intrinsic (for HD(+)) dipole moments and the nuclear motion on the field coupled ground and the first excited electronic states of these single-electron molecular ions, without considering any ionization. To evaluate the HHG spectra, the resonance Floquet quasienergy and the Fourier components of the Floquet state corresponding to the initial vibrational-rotational level v = 0, J = 0 have been calculated by solving the time-independent close-coupled Schrödinger equation following the Floquet ansatz. For HD(+), we have taken into account the symmetry breaking effect of the nonadiabatic interaction or coupling [beyond the Born-Oppenheimer (BO) dynamics] in our calculations of the HHG spectra and have compared the results with the HHG spectra of HD(+) obtained with the BO approximation.

show abstract

“…While the influence of polarization on high-order harmonic generation (HHG) and ATI is well understood [22,23], only few systematic experimental studies about ellipticity in strong field ionization have been concerned with ''recollision'' and nonsequential double ionization (NSDI) of atoms [22,24,25]. Typically, a reduction of ion and HHG yield is attributed to the recolliding electron being driven away from its origin by circularly as opposed…”

mentioning

confidence: 99%

Fragmentation and Ionization Dynamics ofC60in Elliptically Polarized Femtosecond Laser Fields

et al. 2009

View full text Add to dashboard Cite

Ionization and fragmentation of C60 fullerenes is studied in elliptically polarized, intense fs laser fields at 797 nm [I=(0.5-4.3)x10;{14} W cm;{-2}] and contrasted with Xe+, utilizing time-of-flight mass spectrometry. Very pronounced changes of parent and fragment ion yield as a function of ellipticity are observed. At lower intensities reduction of the ion yield for circular polarization establishes a coherent two-photon process connected with the key role of the LUMO+1(t_{1g}) "doorway state" and multielectron dynamics. Comparison with the behavior at 399 nm corroborates this finding. At high intensities enhanced fragmentation is observed which is tentatively attributed to returning loops of electron trajectories by the combined action of the C60+ field and the circular laser field.

show abstract

Ellipticity dependence of atomic and molecular high harmonic generation

Cited by 25 publications

References 0 publications

Possibilities for controlling attosecond x-ray pulse generation during molecular ionization by femtosecond laser radiation

Possibilities for controlling attosecond x-ray pulse generation during molecular ionization by femtosecond laser radiation

A time-independent Hermitian Floquet approach for high harmonic generation in H2+ and HD+: Effect of nonadiabatic interaction in HD+

Fragmentation and Ionization Dynamics ofC60in Elliptically Polarized Femtosecond Laser Fields

Contact Info

Product

Resources

About