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

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.

References in corpus (11)

• Cavity optomechanics using an optically levitated nanosphere
• Direct Frequency Comb Spectroscopy in the Extreme Ultraviolet
• Laser-based acceleration of non-relativistic electrons at a dielectric structure
• Cavity cooling of an optically levitated nanoparticle
• Tunable ion-photon entanglement in an optical cavity
• Ramsey-type phase control of free electron beams
• Cavity cooling of free silicon nanoparticles in high-vacuum
• Holographic generation of highly twisted electron beams
• Design of an electron microscope phase plate using a focused continuous-wave laser
• Diffraction-limited Fabry-Perot Cavity in the Near Concentric Regime
• Measurement of Rb 5P3/2 scalar and tensor polarizabilities in a 1064 nm light field

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• Superradiant Searches for Dark Photons in Two Stage Atomic Transitions