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High harmonic generation

About: High harmonic generation is a research topic. Over the lifetime, 11694 publications have been published within this topic receiving 222650 citations. The topic is also known as: HHG.


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Journal ArticleDOI
TL;DR: The design and the characterization of a monochromator for the spectral selection of ultrashort high-order laser harmonics in the extreme ultraviolet are presented and the temporal characterization of the harmonic pulses has been obtained using a cross-correlation method.
Abstract: The design and the characterization of a monochromator for the spectral selection of ultrashort high-order laser harmonics in the extreme ultraviolet are presented. The instrument adopts the double-grating configuration to preserve the length of the optical paths of different diffracted rays, without altering the extremely short duration of the pulse. The gratings are used in the off-plane mount to have high efficiency. The performances of the monochromator have been characterized in terms of spectral response, efficiency, photon flux, imaging properties, and temporal response. In particular, the temporal characterization of the harmonic pulses has been obtained using a cross-correlation method: Pulses as short as 8 fs have been measured at the output of the monochromators, confirming the effectiveness of the time-delay compensated configuration.

62 citations

Journal ArticleDOI
TL;DR: In this paper, the authors measured the second-order susceptibilities of wurtzite ZnS and CdS monocrystals and determined the relative values of nonlinear susceptibilities.
Abstract: Optical second‐harmonic generation has been measured as a function of alloy composition in wurtzite ZnS—CdS and CdS—CdSe monocrystals. The relative values of the nonlinear susceptibilities were determined; χ33 increased by nearly one order of magnitude as the band gap was decreased from 1.52(2h/ω) to 0.73 (2h/ω). (Because of this strong increase in χ33, appreciable second‐harmonic signals were detected in the crystals of the series which were highly absorbing at the harmonic frequency.) This agreed with the predictions of a quantum‐mechanical analysis. Studies of other II‐VI and III‐V compounds indicated a strong dependence of the second‐order susceptibilities upon the band gap.

62 citations

Journal ArticleDOI
TL;DR: In this article, the effects of laser polarization, pulsewidth, hydrogen pressure, and focusing conditions on the efficiencies of stimulated Raman scattering, four-wave Raman mixing, self-phase modulation, selffocusing, and harmonic generation are investigated.
Abstract: More than 40 rotational Raman lines are generated using an 800-fs Ti:sapphire laser. The spectral region extends from the near-infrared to the far-ultraviolet with a considerably flat intensity distribution. The effects of laser polarization, pulsewidth, hydrogen pressure, and focusing conditions on the efficiencies of stimulated Raman scattering, four-wave Raman mixing, self-phase modulation, self-focusing, and harmonic generation are investigated. A white light continuum, generated by self-phase modulation, acts as a seed beam for the generation of high-order rotational lines through four-wave Raman mixing. Strong self-phase modulation, however, suppresses the generation of the Raman emission, due to a line broadening of the pump beam. Thus, optimization of experimental conditions is necessary for the efficient generation of high-order rotational lines.

62 citations

Journal ArticleDOI
TL;DR: In this paper, the results of odd harmonics generation (up to eleventh, λ = 96 nm) of laser radiation (λ = 1.054 nm, τ = 3 ps) in a low-temperature atmospheric plasma and a surface plasma in vacuum are reported.

62 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023177
2022438
2021399
2020489
2019516
2018433