Watt-class injection-locked diode laser system at 399 nm for atomic physics

TL;DR

This paper presents a high-power, injection-locked diode laser system at 399 nm with stable operation and verified utility in atomic spectroscopy, advancing laser sources for atomic physics research.

Contribution

The authors developed a 399 nm watt-class laser system with stable injection locking and demonstrated its application in ytterbium atomic spectroscopy.

Findings

Achieved up to 1 W output power with 57% locked power fraction.

Maintained stable injection lock for over a day with active stabilization.

Successfully performed atomic spectroscopy on ytterbium using the system.

Abstract

We demonstrate an injection-locked 399 nm laser system with up to 1 W output power and a locked power fraction of 0.57. The system consists of a high power, multimode diode laser that is seeded by 5 mW from a single-mode external cavity diode laser. The locked high-power laser inherits the frequency agility and linewidth of the seed laser with 3.9 kHz broadening. With active stabilization, the injection lock can be maintained for more than a day. We verify the utility of this system for atomic physics by performing spectroscopy of an ytterbium atomic beam.