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Title: 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 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.
Authors:
 [1] ;  [2] ; ;  [3] ; ; ;  [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [2]
  1. ISSP, University of Tokyo, Kashiwa-no-ha, Kashiwa, Chiba 277-8581 (Japan)
  2. (Japan)
  3. RIKEN SPring-8 Center, Sayo, Sayo, Hyogo 679-5148 (Japan)
Publication Date:
OSTI Identifier:
22392286
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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