Improvement of laser damage thresholds of fused silica by ultrasonic-assisted hydrofluoric acid etching

Li Yuan^{1, 2}, Yan Hongwei², Yang Ke², Yao Caizhen², Wang Zhiqiang², Yan Chunyan¹, Zou Xinshu², Yuan Xiaodong², Yang Liming³, Ju Xin^{1, †}

(color online) The correlation between surface properties ((a) PL defect concentration and (b)–(d) surface molecular structure parameters) and LIDTs.