Laser stabilisation to neutral Yb in a discharge with polarization enhanced frequency modulation spectroscopy

TL;DR

This paper demonstrates a polarization-enhanced frequency modulation spectroscopy technique to stabilize a laser for isotope-selective photoionization of neutral Ytterbium atoms, enabling precise ion loading in quantum experiments.

Contribution

It introduces a Doppler-free polarization spectroscopy method for isotope selectivity in Yb, improving laser stabilization for quantum information applications.

Findings

Achieved isotope-resolved dispersive features in Yb discharge lamp

Demonstrated isotope-selective ion loading into RF trap

Implemented lock-in detection for stable laser frequency control

Abstract

Isotope selective optical excitation of atoms is important for experiments with neutral atoms, metrology, and work with trapped ions, including quantum information processing. Polarization-enhanced absorption spectroscopy is used to frequency stabilise a tunable external cavity laser diode system at 398.9 nm for isotope selective photoionization of neutral Yb atoms. This spectroscopy technique is used to measure isotope resolved dispersive features from transitions within a see through configuration Ytterbium hollow-cathode discharge lamp. This Doppler-free dichroic polarization spectroscopy is realised by retro-reflecting a laser beam through the discharge and analysing the polarization dependent absorption with balanced detection. The spectroscopy signal is recovered using lock-in detection of frequency modulation induced by current modulation of the external cavity laser diode. Here, we show the use of polarization-enhanced absorption spectroscopy for isotope selectively loading of $^{171}$Yb$^+$, $^{172}$Yb$^+$, or $^{174}$Yb$^+$ ions into an RF Paul trap.