arXiv subjects

L. Maisenbacher

Publications and source records attributed to L. Maisenbacher.

2 recordsLinked to original sources

arXiv2026

Ultrahigh continuous-wave intensities in high-NA optical cavities through suppression of the parametric oscillatory instability

Ultrahigh continuous-wave intensities (>300 GW/cm$^2$) in high-NA optical cavities enable applications from phase-contrast electron microscopy to ultradeep dipole traps for molecules. However, the intensity can be limited by the parametric oscillatory instability (PI), where mirror vibrations scatter light from one cavity mode into another. We observe PI in a table-top Fabry-Pérot cavity, show that the mechanical modes are MHz-frequency bulk acoustic modes inside the mirrors, and measure their $Q$ factor. By using low-$Q$ mirrors, we achieve >500 GW/cm$^2$ intensities in an open, free-space cavity.

physics.optics↗

arXiv2024

Long-distance chronometric leveling with a portable optical clock

We have measured the geopotential difference between two locations separated by $457~\mathrm{km}$ by comparison of two optical lattice clocks via an interferometric fiber link, utilizing the gravitational redshift of the clock transition frequency. The $^{87}$Sr clocks have been compared side-by-side before and after one of the clocks was moved to the remote location. The chronometrically measured geopotential difference of $3918.1(2.6)\,\mathrm{m^2 \, s^{-2}}$ agrees with an independent geodetic determination of $3915.88(0.30)\,\mathrm{m^2 \, s^{-2}}$. The uncertainty of the chronometric geopotential difference is equivalent to an uncertainty of $27~\mathrm{cm}$ in height.

physics.atom-ph↗