High Harmonic XUV Spectral Phase Interferometry for Direct Electric-Field Reconstruction

Mairesse, Y.; Gobert, O.; Breger, P.; Merdji, H.; Meynadier, P.; Monchicourt, P.; Perdrix, M.; Salières, P.; Carré, B.

doi:10.1103/physrevlett.94.173903

Cited by 85 publications

(47 citation statements)

References 28 publications

(34 reference statements)

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“…Single harmonics of HHG sources have been measured with flat spectral phase at wavelengths below 100 nm [23,24]. However, we note that the power level required by multiplicative seeding schemes such as HGHG and EEHG pushes the current state of the art for a single HHG harmonic.…”

Section: Practical Examplementioning

confidence: 92%

Laser phase errors in seeded free electron lasers

Ratner

Fry

Stupakov

et al. 2012

Phys. Rev. ST Accel. Beams

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Harmonic seeding of free electron lasers has attracted significant attention as a method for producing transform-limited pulses in the soft x-ray region. Harmonic multiplication schemes extend seeding to shorter wavelengths, but also amplify the spectral phase errors of the initial seed laser, and may degrade the pulse quality and impede production of transform-limited pulses. In this paper we consider the effect of seed laser phase errors in high gain harmonic generation and echo-enabled harmonic generation. We use simulations to confirm analytical results for the case of linearly chirped seed lasers, and extend the results for arbitrary seed laser envelope and phase.

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Section: Practical Examplementioning

confidence: 92%

Laser phase errors in seeded free electron lasers

Ratner

Fry

Stupakov

et al. 2012

Phys. Rev. ST Accel. Beams

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show abstract

“…The CCD pixels have been binned 4 by 4 yielding a pixel size of 54 µm. The time resolution of this experiment is less than 45 fs (FWHM), which is set predominantly by the infrared pulse duration (40 fs), because the harmonic pulses are much shorter 32,33 and because there is no jitter between infrared and harmonic pulses in this set-up.…”

Section: Methodsmentioning

confidence: 99%

Laser-induced ultrafast demagnetization in the presence of a nanoscale magnetic domain network

et al. 2012

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Femtosecond magnetization phenomena have been challenging our understanding for over a decade. most experiments have relied on infrared femtosecond lasers, limiting the spatial resolution to a few micrometres. With the advent of femtosecond X-ray sources, nanometric resolution can now be reached, which matches key length scales in femtomagnetism such as the travelling length of excited 'hot' electrons on a femtosecond timescale. Here we study laser-induced ultrafast demagnetization in [Co/Pd] 30 multilayer films, which, for the first time, achieves a spatial resolution better than 100 nm by using femtosecond soft X-ray pulses. This allows us to follow the femtosecond demagnetization process in a magnetic system consisting of alternating nanometric domains of opposite magnetization. no modification of the magnetic structure is observed, but, in comparison with uniformly magnetized systems of similar composition, we find a significantly faster demagnetization time. We argue that this may be caused by direct transfer of spin angular momentum between neighbouring domains.

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“…Different versions of the SPIDER (section 1.3.2) technique for the XUV have been implemented as well. In [114], two time-delayed IR pulses with slightly different central wavelengths are generating almost identical attosecond pulses with a spectral shear. This shift in frequency produces an interferogram which can be detected directly with an X-ray spectrometer.…”

Section: Characterization Methodsmentioning

confidence: 99%