All-solid-state continuous-wave laser systems for ionization, cooling and quantum state manipulation of beryllium ions

TL;DR

This paper presents the development of all-solid-state continuous-wave laser systems at multiple wavelengths for efficient ionization, cooling, and quantum manipulation of beryllium ions, enabling advanced quantum experiments.

Contribution

It introduces novel laser systems with high power and stability at specific wavelengths crucial for beryllium ion control, combining frequency doubling and sum-frequency generation techniques.

Findings

Up to 400 mW at 470 nm and 28 mW at 235 nm for photoionization.

7.2 W at 626 nm and 1.9 W at 313 nm for ion control.

Intensity fluctuations below 0.5% per hour at 313 nm.

Abstract

We describe laser systems for photoionization, Doppler cooling and quantum state manipulation of beryllium ions. For photoionization of neutral beryllium, we have developed a continuous-wave 235 nm source obtained by two stages of frequency doubling from a diode laser at 940 nm. The system delivers up to 400 mW at 470 nm and 28 mW at 235 nm. For control of the beryllium ion, three laser wavelengths at 313 nm are produced by sum-frequency generation and second-harmonic generation from four infrared fiber lasers. Up to 7.2 W at 626 nm and 1.9 W at 313 nm are obtained using two pump beams at 1051 and 1551 nm. Intensity fluctuations below 0.5 % per hour (during 8 hours of operation) have been measured at a 313 nm power of 1 W. These systems are used to load beryllium ions into a segmented ion trap.