Time-resolved photoemission apparatus achieving sub-20-meV energy resolution and high stability

The paper describes a time- and angle-resolved photoemission apparatus consisting of a hemispherical analyzer and a pulsed laser source. We demonstrate 1.48-eV pump and 5.92-eV probe measurements at the ⩾10.5-meV and ⩾240-fs resolutions by use of fairly monochromatic 170-fs pulses delivered from a r...

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Bibliographic Details
Published in:Review of scientific instruments 2014-12, Vol.85 (12), p.123904-123904
Main Authors: Ishida, Y, Togashi, T, Yamamoto, K, Tanaka, M, Kiss, T, Otsu, T, Kobayashi, Y, Shin, S
Format: Article
Language:English
Subjects:
Beams (radiation)
DATASETS
ENERGY RESOLUTION
EV RANGE
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MONOCHROMATIC RADIATION
Photoelectric emission
PHOTOEMISSION
Pulsed lasers
PUMPS
Sapphire
Scientific apparatus & instruments
SOLID STATE LASERS
STABILITY
SUPERCONDUCTORS
SURFACES
TIME RESOLUTION
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Summary:The paper describes a time- and angle-resolved photoemission apparatus consisting of a hemispherical analyzer and a pulsed laser source. We demonstrate 1.48-eV pump and 5.92-eV probe measurements at the ⩾10.5-meV and ⩾240-fs resolutions by use of fairly monochromatic 170-fs pulses delivered from a regeneratively amplified Ti:sapphire laser system operating typically at 250 kHz. The apparatus is capable to resolve the optically filled superconducting peak in the unoccupied states of a cuprate superconductor, Bi2Sr2CaCu2O(8 + δ). A dataset recorded on Bi(111) surface is also presented. Technical descriptions include the followings: A simple procedure to fine-tune the spatio-temporal overlap of the pump-and-probe beams and their diameters; achieving a long-term stability of the system that enables a normalization-free dataset acquisition; changing the repetition rate by utilizing acoustic optical modulator and frequency-division circuit.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4903788