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

Journal Article · Mon Dec 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4903788· OSTI ID:22392286

Togashi, T.; Yamamoto, K. ^[1]; Tanaka, M.; Kiss, T.; Otsu, T. ^[2]; Kobayashi, Y. ^[2]; Shin, S. ^[2]

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1. RIKEN SPring-8 Center, Sayo, Sayo, Hyogo 679-5148 (Japan)
2. ISSP, University of Tokyo, Kashiwa-no-ha, Kashiwa, Chiba 277-8581 (Japan)

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, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 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.

• OSTI ID: 22392286
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DATASETS
ENERGY RESOLUTION
EV RANGE
MONOCHROMATIC RADIATION
PHOTOEMISSION
PUMPS
SOLID STATE LASERS
STABILITY
SUPERCONDUCTORS
SURFACES
TIME RESOLUTION