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arXiv · 1610.08493

Continuous 40 GW/cm$^2$ laser intensity in a near-concentric optical cavity

Osip Schwartz·Jeremy J. Axelrod·Philipp Haslinger·Colin Ophus·Robert M. Glaeser·Holger Müller
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Abstract

Manipulating free-space electron wave functions with laser fields can bring about new electron-optical elements for transmission electron microscopy. In particular, a Zernike phase plate would enable high-contrast imaging of soft matter, leading to new opportunities in structural biology and materials science. A Zernike plate can be implemented using a tight, intense CW laser focus that shifts the phase of the electron wave by the ponderomotive potential. Here, we use a near-concentric cavity to focus 7.5 kW of circulating laser power at 1064 nm into a 7 $\mu$m waist, setting a record for CW laser intensity and establishing a pathway to ponderomotive phase contrast TEM.

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Osip Schwartz, Jeremy J. Axelrod, Philipp Haslinger, Colin Ophus, Robert M. Glaeser, Holger Müller. 2016-10-26. Continuous 40 GW/cm$^2$ laser intensity in a near-concentric optical cavity. https://doi.org/10.1364/oe.25.014453

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