Lineshape-asymmetry elimination in weak atomic transitions driven by an intense standing wave field

TL;DR

This paper investigates how to eliminate lineshape asymmetry caused by the ac-Stark effect in weak atomic transitions driven by intense standing wave fields, using methods involving multiple resonator modes.

Contribution

It introduces two novel techniques to prevent lineshape distortion in atomic transitions driven by intense standing waves, enhancing measurement accuracy.

Findings

Demonstrated lineshape asymmetry elimination using multiple longitudinal modes.

Achieved lineshape correction with multiple transverse modes.

Improved precision in atomic transition measurements.

Abstract

Owing to the ac-Stark effect, the lineshape of a weak optical transition in an atomic beam can become significantly distorted, when driven by an intense standing wave field. We use an Yb atomic beam to study the lineshape of the 6s2 1S0 -> 5d6s 3D1 transition, which is excited with light circulating in a Fabry-Perot resonator. We demonstrate two methods to avoid the distortion of the transition profile. Of these, one relies on the operation of the resonator in multiple longitudinal modes, and the other in multiple transverse modes.