Optical Imaging

Taking tabletop tomography to extremes

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Science  29 Sep 2017:
Vol. 357, Issue 6358, pp. 1367-1368
DOI: 10.1126/science.357.6358.1367-g

The practice of slicing through a sample at various depths with extreme ultraviolet (XUV) light to build up a three-dimensional picture of it is usually confined to synchrotron facilities. Intense infrared laser pulses impinging onto a gas cell of noble atoms generates high harmonics and provides access to the short wavelengths of XUV light with a tabletop source. Fuchs et al. show that filtering and focusing the high harmonics can narrow the range of wavelengths to produce a coherent XUV source. They demonstrate extreme coherent tomography by building up a three-dimensional image of a structured semiconductor sample with a depth resolution of 24 nanometers, providing an example of a tabletop laser source for highly spatially and temporally resolved coherent imaging applications.

Optica 4, 903 (2017).

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