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Q: Fachverband Quantenoptik und Photonik

Q 56: Quantum Gases: Fermions II

Q 56.4: Vortrag

Donnerstag, 9. März 2023, 15:15–15:30, F342

Full phase aberration correction - from the source to the atoms — •Paul Hill, Philipp Lunt, Johannes Reiter, Philipp Preiss, and Selim Jochim — Physikalisches Institut, Heidelberg, Deutschland

Using light to engineer a broad class of potential landscapes for ultracold atoms has enabled numerous breakthroughs in the field of analog quantum simulation [1]. Especially, trapping and manipulation of individual particles requires light patterns of exquisite precision saturating the diffraction limit of high NA optics. Characterizing and eliminating wavefront errors in an optical setup is therefore a key factor for experimental success, but usually proves to be challenging or can only be done for parts of the setup.

Here, we present a method to measure the entirety of aberrations acquired in an optical setup with a Spatial Light Modulator (SLM), from the source plane to the atoms. This method relies on a type of Phase Shift Interferometry (PSI) [2] where we use a double well pattern sensitive to the phase aberrations present in the light path. Imaging the fluorescence signal of only 100 atoms trapped in this double well potential is sufficient to retrieve the relevant phase information, which is then used to cancel aberrations on the SLM. This allows critical components, including our vacuum window, to be mapped out that are usually inaccessible to aberration correction.

[1] W Hofstetter and T Qin 2018 J. Phys. B: At. Mol. Opt. Phys. 51 082001

[2] Philip Zupancic et al. Opt. Express 24, 13881-13893 (2016)