A comprehensive study of second and third harmonic conversion efficiency, angular and temperature tolerance, and long-term stability in LBO crystals using a 10-J-class laser
Huzefa Aliasger, Ond\v{r}ej Nov\'ak, Zbyn\v{e}k Hubka, Martin Hanu\v{s}, Petr Navr\'atil, Patricie Severov\'a, Ond\v{r}ej Denk, Jan Pila\v{r}, Tom\'a\v{s} Paliesek, Martin Divok\'y, Ond\v{r}ej Schreiber, Michal Jel\'inek, Martin Smr\v{z}, Tom\'a\v{s} Mocek
TL;DR
This study demonstrates high-efficiency second and third harmonic generation in LBO crystals using a 10-J-class laser, analyzing angular and temperature tolerances and confirming long-term stability for high-power applications.
Contribution
It provides comprehensive experimental data and validation for LBO crystals' performance in high-energy harmonic generation, including efficiency, tolerance, and stability metrics.
Findings
Achieved 75% SHG and 56% THG conversion efficiencies.
Measured angular and temperature acceptance bandwidths and validated via simulations.
Long-term energy stability of around 1.3% RMS for both SHG and THG.
Abstract
We present a study of second harmonic generation (SHG) and third harmonic generation (THG) in lithium triborate (LBO) crystals using a high-energy, 10-J-class, 10 Hz Yb:YAG laser system. We achieved high conversion efficiencies of 75% for SHG and 56% for THG for Gaussian-like temporal pulse shapes and top-hat-like beam profiles. The angular and temperature dependence of the LBO crystals were measured and validated through numerical simulations. The SHG process exhibited an angular acceptance bandwidth of 1.33 mrad and a temperature acceptance bandwidth of 2.61 K, while the THG process showed 1.19 mrad and 1.35 K, respectively. Additionally, long term stability measurements revealed RMS energy stabilities of 1.3% for SHG and 1.24% for THG. These results showcase the reliability of LBO crystals for high-energy, high-average-power harmonic generation. The developed system offers automated…
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