A tunable, continuous-wave 130-mW laser at 213 nm

TL;DR

This paper reports a tunable, continuous-wave 213 nm laser with 130 mW power, achieved through frequency quadrupling of a Ti:sapphire laser with high efficiency and stability, suitable for scientific applications.

Contribution

The authors developed a stable, high-power deep UV laser at 213 nm using a novel cavity-enhanced quadrupling setup with improved UV stability.

Findings

Achieved 130 mW continuous-wave output at 213 nm.

Used two-stage SHG with high conversion efficiency over 80%.

Demonstrated stable operation suitable for scientific applications.

Abstract

We present a tunable, continuous-wave (CW) laser system emitting at 213 nm, based on the frequency quadrupling of a single Ti:sapph laser. The setup features two sequential, cavity-enhanced second-harmonic generation (SHG) stages. The first stage uses an LBO crystal and achieves a conversion efficiency of over 80%, yielding up to 3.3 W at 426 nm. The second stage employs a Brewster-cut BBO crystal with an elliptical beam waist to mitigate UV-induced degradation, producing up to 130 mW of deep UV light. The system demonstrates stable operation over several hours and is well suited for applications in atomic physics, spectroscopy, and materials science.