A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy

• Here, we present a high repetition rate, narrow bandwidth, extreme ultraviolet photon source for time- and angle-resolved photoemission spectroscopy. The narrow bandwidth pulses Δ E = 9, 14, and 18 meV for photon energies h ν = 10.8, 18.1, and 25.3 eV are generated through high harmonic generation using ultra-violet drive pulses with relatively long pulse lengths (461 fs). The high harmonic generation setup employs an annular drive beam in tight focusing geometry at a repetition rate of 250 kHz. Photon energy selection is provided by a series of selectable multilayer bandpass mirrors and thin film filters, thus avoiding any time broadening introduced by single grating monochromators. A two stage optical-parametric amplifier provides < 100 fs tunable pump pulses from 0.65 μm to 9 μm. The narrow bandwidth performance of the light source is demonstrated through angle-resolved photoemission measurements on a series of quantum materials, including high-temperature superconductor Bi-2212, WSe2, and graphene. 

Ämnesord

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

Nyckelord

Bandwidth

Film preparation

Harmonic generation

High temperature superconductors

Multilayers

Optical frequency conversion

Optical pumping

Parametric amplifiers

Photoelectron spectroscopy

Photons

Angle resolved photoemission spectroscopy

Extreme ultra violet light sources

Extreme Ultraviolet

High harmonic generation

High repetition rate

Narrow bandwidth

Photon energy

Photon sources

Time-resolved photoemissions

Ultraviolet photon

Optical parametric amplifiers

Publikations- och innehållstyp

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