Open AccessImprovement and formation of UV-induced damage on LBO crystal surface during long-term high-power third-harmonic generation
Author(s) -
Hailong Hong,
Qiang Liu,
Lei Huang,
Mali Gong
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.007285
Subject(s) - materials science , surface roughness , impurity , optics , crystal (programming language) , surface finish , nanometre , second harmonic generation , high harmonic generation , optoelectronics , laser , composite material , chemistry , physics , organic chemistry , computer science , programming language
We demonstrate the improvement and formation of UV-induced damage on LBO crystal output surface during long-term (130 h) high-power (20 W) high-repetition-rate (80 kHz) third-harmonic generation. The output surface was super-polished (RMS surface roughness <0.6 nm) to sub-nanometer scale super smooth roughness. The surface lifetime has been improved more than 20-fold compared with the as-polished ones (RMS surface roughness 4.0~8.0 nm). The damage could be attributed to the consequence of thermal effects resulted from impurity absorptions. Simultaneously, it was verified that the impurities originated in part from the UV-induced deposition.