Laser based soft-x-ray pulses for photoelectron spectroscopy of surfaces

Tsilimis, G.; Benesch, C.; Kutzner, J.; Zacharias, H.

doi:10.1364/josab.20.000246

Cited by 24 publications

(7 citation statements)

References 36 publications

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“…The linewidths increase approximately linearly from about 110 meV for the fifth harmonic ͑7.8 eV͒ to 790 meV for the 29th harmonic ͑47 eV͒ in qualitative agreement with previous reports. 16 The increase is due to the decreasing resolution of the grating monochromator and the increase in linewidth with the har- monic order. 17 The latter contribution depends strongly on laser parameters, so a quantitative comparison is not possible.…”

Section: Characterization Of Higher Harmonicsmentioning

confidence: 99%

Time-resolved photoemission at the Si(100)-Ga surface using a femtosecond higher-harmonic laser source

et al. 2009

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The Si͑100͒-͑2 ϫ 2͒-Ga surface was used to investigate time-dependent Ga͑3d͒ core-level shifts by pumping electrons from the valence to the conduction band. The pump-probe experiments were done by exciting carriers with 1.59 eV laser pulses and probing the Ga͑3d͒ core level with higher harmonics. The higher harmonics were generated by focusing laser pulses with 1.4 mJ energy, 30 fs pulse duration, and 779 nm wavelength from a multipass amplifier at a repetition rate of 1 kHz into argon. For the 23rd harmonic, the time resolution of the experiment was ϳ400 fs after a grating monochromator. The band bending of about 110 meV of the p-doped Si͑100͒-͑2 ϫ 2͒-Ga surface is completely lifted by illumination of the surface with the 1.59 eV laser pulses. The Ga͑3d͒ core level shows a slow time-dependent shift attributed to the rise ͑ϳ1 ns͒ and decay ͑ϳ100 ns͒ of the photovoltage. The Ga͑3d͒ core-level shift and broadening in the femtosecond range are determined to be Ͻ15 meV at the used pump-pulse intensity of 19 mJ/ cm 2 . Experiments with pump pulses of 3.18 eV photon energy showed similar results.

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Section: Characterization Of Higher Harmonicsmentioning

confidence: 99%

Time-resolved photoemission at the Si(100)-Ga surface using a femtosecond higher-harmonic laser source

et al. 2009

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“…Particularly, by using the gratings, a good spectral resolution with a broad tunable spectral range has been achieved. However, it has been demonstrated that the harmonic selection using a diffraction grating could significantly stretch the radiation pulse in the time domain [17,18] even that the stretching can be limited by reducing the incident angle but with the cost of grating reflectivity. [19,20] To overcome this shortcoming, Poletto et al [21] have demonstrated a time-preserving monochromator for XUV and soft x-ray regions in which a single diffraction grating is operated in a conical diffraction.…”

Section: Introductionmentioning

confidence: 99%

A tunable XUV monochromatic light source based on the time preserving grating selection of high-order harmonic generation

Niu¹,

Liang²,

Liu³

et al. 2017

Chinese Phys. B

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We accomplish a laboratory facility for producing a femtosecond XUV coherent monochromatic radiation with a broad tunable spectral range of 20 eV-75 eV. It is based on spectral selected single-order harmonics from intense laser driven high harmonic generation in gas phase. The time preserving for the selected harmonic radiation is achieved by a Czerny-Turner type monochromator designed with a conical diffraction grating mount for minimizing the time broadening caused by grating diffraction and keeping a relatively high diffraction efficiency. Our measurement shows that the photon flux of the 23-order harmonic (H23) centered at 35.7 eV is 1×10 9 photons/s approximately with a resolving power E/∆E ≈ 36. This source provides an ultrashort tunable monochromatic XUV beam for ultrafast studies of electronic and structural dynamics in a large variety of matters.

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“…16,20 A second category of time-resolved ARPES experiments is based on high-harmonic generation (HHG) techniques. [21][22][23][24][25][26][27][28][29] As in the systems above, the fundamental beam for these types of systems is typically a solid-state laser. HHG sources circumvent the low photon energy problem by taking advantage of dramatic nonlinear processes which occur when a laser pulse is focused through an atomic gas 30,31 or reflected off of plasmonic mirrors.…”

Section: Introductionmentioning

confidence: 99%

An ultrafast angle-resolved photoemission apparatus for measuring complex materials

Smallwood

Jozwiak

Zhang

et al. 2012

Review of Scientific Instruments

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We present technical specifications for a high resolution time- and angle-resolved photoemission spectroscopy setup based on a hemispherical electron analyzer and cavity-dumped solid state Ti:sapphire laser used to generate pump and probe beams, respectively, at 1.48 and 5.93 eV. The pulse repetition rate can be tuned from 209 Hz to 54.3 MHz. Under typical operating settings the system has an overall energy resolution of 23 meV, an overall momentum resolution of 0.003 Å(-1), and an overall time resolution of 310 fs. We illustrate the system capabilities with representative data on the cuprate superconductor Bi(2)Sr(2)CaCu(2)O(8+δ). The descriptions and analyses presented here will inform new developments in ultrafast electron spectroscopy.

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Laser based soft-x-ray pulses for photoelectron spectroscopy of surfaces

Cited by 24 publications

References 36 publications

Time-resolved photoemission at the Si(100)-Ga surface using a femtosecond higher-harmonic laser source

Time-resolved photoemission at the Si(100)-Ga surface using a femtosecond higher-harmonic laser source

A tunable XUV monochromatic light source based on the time preserving grating selection of high-order harmonic generation

An ultrafast angle-resolved photoemission apparatus for measuring complex materials

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