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Proceedings Paper

Development of a tunable high repetition rate XUV source for time-resolved photoemission studies of ultrafast dynamics at surfaces
Author(s): Christopher Corder; Peng Zhao; Xinlong Li; Matthew D. Kershis; Michael G. White; Thomas K. Allison
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Paper Abstract

The characterization of surfaces using photoelectron spectroscopy or photoemission electron microscopy provides sensitive probes of surface structure and electronic properties. Conventional extreme ultraviolet (XUV) light sources used for photoemission do not have ultrafast time resolution, which inhibits applying these techniques to the study of surface dynamics on their natural time scale. The high harmonics (HHG) of intense femtosecond laser pulses are capable of providing ultrashort XUV pulses for photoemission. However, for pulse-based photoemission measurements it is necessary to limit the density of electrons emitted by each pulse to prevent detrimental spacecharge effects. Therefore, to maintain reasonable data acquisition rates, the pulses must occur at a high repetition rate. Since the HHG process requires high peak fundamental laser powers, repetition rates have typically been limited to well below 1 MHz.

In our lab, we can perform time-resolved XUV photoemission experiments at an 87 MHz repetition rate using a cavity-enhanced HHG source. Harmonics are generated at 87 MHz by resonantly enhancing a Yb:fiber laser capable of 1 μJ pulses in a passive optical cavity to pulse energies > 100 μJ. Average photon fluxes of up to 7x1011 photons/s in a single isolated harmonic are delivered to a surface science end station. This delivered flux and repetition rate are comparable to a synchrotron light source, but with pulse durations nearly 1000 times shorter. In this paper, we discuss critical details of the source and its performance.

Paper Details

Date Published: 16 February 2018
PDF: 7 pages
Proc. SPIE 10519, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII, 105190B (16 February 2018); doi: 10.1117/12.2295232
Show Author Affiliations
Christopher Corder, Stony Brook Univ. (United States)
Peng Zhao, Stony Brook Univ. (United States)
Xinlong Li, Stony Brook Univ. (United States)
Matthew D. Kershis, Brookhaven National Lab. (United States)
Michael G. White, Stony Brook Univ. (United States)
Brookhaven National Lab. (United States)
Thomas K. Allison, Stony Brook Univ. (United States)

Published in SPIE Proceedings Vol. 10519:
Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII
Beat Neuenschwander; Costas P. Grigoropoulos; Tetsuya Makimura; Gediminas Račiukaitis, Editor(s)

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