# Measurement of magic-wavelength optical dipole trap by using the laser-induced fluorescence spectra of trapped single cesium atoms

## TL;DR

This paper experimentally measures the magic wavelength for a cesium optical dipole trap using laser-induced fluorescence spectra, demonstrating minimal differential light shifts at 937.7 nm for precise atomic control.

## Contribution

The study identifies and characterizes the magic wavelength for cesium atoms in a linearly-polarized optical dipole trap, combining theoretical calculations with experimental validation.

## Key findings

- Magic wavelength is 937.7 nm with minimal differential light shift.
- Differential light shift is less than 0.7 MHz, under 1.2% of trap depth.
- Influence of trap depth and magnetic field on measurements discussed.

## Abstract

Based on the multi-level model, we have calculated light shifts for Zeeman states of hyperfine levels of cesium (Cs) 6S1/2 ground state and 6P3/2 excited state.The magic-wavelength linearly-polarized optical dipole trap (ODT) for Cs 6S1/2 F=4, mF=+4 - 6P3/2 F'=5, mF=+5 transition is experimentally constructed and characterized by using the laser-induced fluorescence spectra of trapped single Cs atoms. The magic wavelength is 937.7 nm which produces almost the same light shift for 6S1/2 F=4, mF=+4 ground state and 6P3/2 F'=5, mF=+5 excited state with linearly-polarized ODT laser beam. Compared to undisturbed Cs 6S1/2 F=4, mF=+4 - 6P3/2 F'=5, mF=+5 transition frequency in free space, the differential light shift is less than 0.7 MHz in a linearly-polarized 937.7 nm ODT, which is less than 1.2% of the trap depth. We also discussed influence of the trap depth and the bias magnetic field on the measurement results.

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Source: https://tomesphere.com/paper/1706.06305