Half-kilowatt high energy third harmonic conversion to 50 J @ 10 Hz at 343 nm

TL;DR

This paper demonstrates high-energy third harmonic generation at 343 nm, achieving 50 J pulses at 10 Hz with over 50% efficiency using a cryogenic Yb:YAG laser and LBO crystals.

Contribution

It presents a novel high-energy, high-repetition-rate frequency tripling system with stable 50 J pulses at 343 nm, advancing laser technology for UV applications.

Findings

Achieved 50 J pulse energy at 343 nm with 53% efficiency.

Demonstrated stable operation at 10 Hz repetition rate.

Utilized cryogenic Yb:YAG laser with optimized nonlinear crystals.

Abstract

We report on frequency tripling of high energy, high repetition rate ns pulses from a cryogenically gas cooled multi-slab Yb:YAG laser system Bivoj/DiPOLE, using a type-I phase matched LBO crystal for second harmonic generation and type-II phase matched LBO crystal for sum frequency generation. We achieved conversion to 343 nm with stable energy of 50 J at repetition rate of 10 Hz and conversion efficiency of 53%.