Ultra-low Frequency Noise External Cavity Diode Laser Systems for Quantum Applications

TL;DR

This paper introduces two ultra-low frequency noise lasers at 729 nm, analyzing their characteristics and locking capabilities, with implications for high-fidelity quantum applications.

Contribution

It presents two distinct ultra-low noise laser systems based on different diodes, with experimental and theoretical analysis of their noise characteristics and locking performance.

Findings

Achieved a Lorentzian linewidth of 0.1 kHz.

Demonstrated locking on medium-finesse cavities.

Compared mode behavior and noise reduction techniques.

Abstract

We present two distinct ultra-low frequency noise lasers at 729 nm with a fast frequency noise of 30 Hz^2/Hz, corresponding to a Lorentzian linewidth of 0.1 kHz. The characteristics of both lasers, which are based on different types of laser diodes, are investigated using experimental and theoretical analysis with a focus on identifying the advantages and disadvantages of each type of system. Specifically, we study the differences and similarities in mode behaviour while tuning frequency noise and linewidth reduction. Furthermore, we demonstrate the locking capability of these systems on medium-finesse cavities. The results provide insights into the unique operational characteristics of these ultra-low noise lasers and their potential applications in quantum technology that require high levels of control fidelity.