Spectrum of high harmonics generated by two-color circularly polarized laser field in atomic media

Andreev, A. V.; Stremoukhov, S. Yu.; Shoutova, O. A.

doi:10.1088/1555-6611/abaefd

Cited by 4 publications

(2 citation statements)

References 24 publications

(44 reference statements)

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“…On the other hand, 3q order harmonics correspond to the absorption of a net amount of q photons of each ω and 2ω fields, i.e., total 2q photons, preserving the parity of initial state and thus recombination by emitting a single photon of frequency 3qω is parity forbidden [46,51,52]. It is worth mentioning that the precluded harmonics at frequency 3qω are corresponding to the harmonic peaks at the integer multiple of summary frequency ω + 2ω = 3ω and are not related to the third harmonic of the fundamental (ω) field [53]. In figure 2(b), the positions of harmonic peak match well with those predicted by the selection rules as mentioned earlier.…”

Section: Resultsmentioning

confidence: 99%

Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

Rajpoot¹,

Holkundkar²,

Bandyopadhyay³

2021

J. Phys. B: At. Mol. Opt. Phys.

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We study the high harmonic generation (HHG) using elliptically polarized two-color driving fields. The HHG via bi-chromatic counter-rotating laser fields is a promising source of circularly polarized ultrashort XUV radiation at the attosecond time scale. The ellipticity or the polarization of the attosecond pulses can be tweaked by modifying the emitted harmonics' ellipticity, which can be controlled by varying the driver fields. A simple setup is used to control the polarization of the driving fields, which eventually changes the ellipticity of the attosecond pulses. A well-defined scaling for the ellipticity of the attosecond pulse as a function of the rotation angle of the quarter-wave plate is also deduced by solving the time-dependent Schr\"odinger equation (TDSE) in two dimensions. The scaling can further be explored to obtain the attosecond pulses of the desired degree of polarization, ranging from linear to elliptical to circular polarization.

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Section: Resultsmentioning

confidence: 99%

Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

Rajpoot¹,

Holkundkar²,

Bandyopadhyay³

2021

J. Phys. B: At. Mol. Opt. Phys.

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show abstract

“…On the other hand, 3q order harmonics correspond to the absorption of a net amount of q photons of each ω and 2ω fields, i.e., total 2q photons, preserving the parity of initial state and thus recombination by emitting a single photon of frequency 3qω is parity forbidden [39,44,45]. It is worth mentioning that the precluded harmonics at frequency 3qω are corresponding to the harmonic peaks at the integer multiple of summary frequency ω + 2ω = 3ω and are not related to the third harmonic of the fundamental (ω) field [46]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

Rajpoot,

Holkundkar,

Bandyopadhyay

2021

Preprint

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We study the higher-harmonic generation (HHG) using elliptically polarized two-color driving fields. The HHG via bi-chromatic counter-rotating laser fields is a promising source of circularly polarized ultrashort XUV radiation at the attosecond time scale. The ellipticity or the polarization of the attosecond pulses can be tweaked by modifying the emitted harmonics' ellipticity, which can be controlled by varying the driver fields. We propose a simple setup to control the polarization of the driving fields, which eventually changes the ellipticity of the attosecond pulses. A well-defined scaling law for the ellipticity of the attosecond pulse as a function of the rotation angle of the quarter-wave plate is also deduced by solving the time-dependent Schrödinger equation (TDSE) in two dimensions. The scaling law can further be explored to obtain the attosecond pulses of the desired degree of polarization, ranging from linear to elliptical to circular polarization.

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High Harmonic Generation near the Low-Frequency Edge of a Plateau under Nonlinear Propagation of 1.24-μm Near-Infrared Femtosecond Laser Radiation in a Dense Argon Jet

Rumiantsev,

Pushkin,

Potemkin

2023

Jetp Lett.

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High (15–25) harmonic generation in the vacuum ultraviolet spectral range (83–50 nm) has been realized by focused (NA = 0.033) near-infrared femtosecond laser radiation (wavelength λ = 1.24 μm) with a vacuum intensity of ~7.5 × 1014 W/cm2 irradiating a dense gas jet. It has been shown experimentally that the use of such a high-numerical aperture focusing requires high (up to 10 bar) gas jet pressures to optimize phase matching. The use of the dense gas jet results in a noticeable manifestation of nonlinear propagation effects for generating radiation, which affect the generation process through the change in the phase matching conditions. Furthermore, it has been shown that the prechirping of the generating pulse makes it possible to compensate a chirp appearing due to self-phase modulation and to increase the harmonic generation efficiency because of the nonlinear compression of the generating pulse. This approach has allowed 17th (73 nm) harmonic generation with an energy of 2 pJ in a pulse and a generation efficiency of 5.4 × 10–9. The estimates obtained have shown that this radiation can be used for single-pulse maskless photolithography in the extreme ultraviolet range.

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Spectrum of high harmonics generated by two-color circularly polarized laser field in atomic media

Cited by 4 publications

References 24 publications

Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

High Harmonic Generation near the Low-Frequency Edge of a Plateau under Nonlinear Propagation of 1.24-μm Near-Infrared Femtosecond Laser Radiation in a Dense Argon Jet

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