Active and passive stabilization of a high-power UV frequency-doubled diode laser

TL;DR

This paper describes a high-power UV laser system with stable output and active stabilization capabilities, achieved through resonant frequency doubling and computer-controlled alignment, suitable for precision applications.

Contribution

It introduces a novel high-power UV laser system with integrated active stabilization and automated beam alignment, enhancing stability and performance over previous systems.

Findings

Output power of up to 2.6 W at 400 nm achieved

Relative intensity noise of 0.12% RMS demonstrated

Active stabilization and automated alignment implemented successfully

Abstract

We present a resonantly frequency-doubled tapered amplified semiconductor laser system emitting up to 2.6 W blue light at 400 nm. The output power is stable on both short and long timescales with 0.12% RMS relative intensity noise, and less than 0.15%/h relative power loss over 16 hours of free running continuous operation. Furthermore, the output power can be actively stabilized, and the alignment of the input beams of the tapered amplifier chip, the frequency doubling cavity and-in case of fiber output-the fiber can be optimized automatically using computer-controlled mirrors.