Influence of the wavelength on the spatial resolution of pulsed-laser atom probe

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3657846· OSTI ID:22036761

Gault, B ^[1]; Chen, Y M; Hono, K ^[2]; Moody, M P; Ringer, S P ^[1]; Ohkubo, T ^[3]

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1. Australian Centre for Microscopy and Microanalysis, Madsen Building F09, University of Sydney, NSW 2006 (Australia)
2. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-0047 (Japan)
3. National Institute for Materials Science, Tsukuba 305-0047 (Japan)

Modern atom probes typically incorporate an ultrafast pulsed-laser source with wavelength ranging from infrared (IR) to ultraviolet (UV) depending on the specific instrument. In order to estimate the influence of the wavelength on the accuracy of the technique, the achievable in-depth spatial resolution has been measured for atom probe analyses of the same pure W specimen using three different wavelengths and across a range of laser pulse energies. UV illumination is shown to yield superior spatial resolution to both IR and visible (green) wavelengths. We propose that this improvement relates to a faster decay of temperature enabled by light absorption confined to the near apex region.

• OSTI ID: 22036761
• Journal Information: Journal of Applied Physics, Vol. 110, Issue 9; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
47 OTHER INSTRUMENTATION
ABSORPTION
ATOMS
ILLUMINANCE
ION MICROSCOPY
LASERS
PROBES
PULSED IRRADIATION
PULSES
SPATIAL RESOLUTION
TUNGSTEN
ULTRAVIOLET RADIATION
VISIBLE RADIATION
WAVELENGTHS