A diode laser stabilization scheme for 40Ca+ single ion spectroscopy

TL;DR

This paper introduces a laser stabilization scheme for 40Ca+ ion spectroscopy, achieving high frequency stability and narrow linewidths by locking multiple lasers to atomic references using transfer cavities.

Contribution

A novel laser stabilization method using transfer cavities and atomic references for precise 40Ca+ ion spectroscopy.

Findings

Laser linewidth of 123 kHz measured

High stability with Allan variance of 10^(-22) at 10 s

Successful comparison with Bloch equation model

Abstract

We present a scheme for stabilizing multiple lasers at wavelengths between 795 and 866 nm to the same atomic reference line. A reference laser at 852 nm is stabilized to the Cs D2 line using a Doppler-free frequency modulation technique. Through transfer cavities, four lasers are stabilized to the relevant atomic transitions in 40Ca+. The rms linewidth of a transfer-locked laser is measured to be 123 kHz with respect to an independent atomic reference, the Rb D1 line. This stability is confirmed by the comparison of an excitation spectrum of a single 40Ca+ ion to an eight-level Bloch equation model. The measured Allan variance of 10^(-22) at 10 s demonstrates a high degree of stability for time scales up to 100 s.