Effect of polishing process on silica surface laser-induced damage threshold at 355 nm

Effect of subsurface impurities of fused silica on laser-induced damage probability

“…The polishing contaminants in the near-surface region of optical components can absorb sub-band gap light and produce a local heating that can initiate a material damage. 5 Many experimental facts have shown that absorbing nanometer-sized inclusions are responsible for the initiation of the damage process: an increase of the damage thresholds with purification of subsurface of fused silica; 6,7 a spatial variation of the damage threshold on the surface or in bulk of optical substrates; 8,9 and a dependence of the damage threshold on the irradiation spot-size and wavelength. 10,11 However, in most cases, the impurities are not identified by modern optical techniques since they are nanoscale size and are distributed at low concentration.…”

Hexagonal boron nitride nanosheets incorporated antireflective silica coating with enhanced laser-induced damage threshold

“…For this end, it is necessary to improve the surface quality of substrate and the interface energy diffusion between coating and substrate. The most frequently used methods for polishing substrate include ultrasonic cleaning, fine abrasive liquid polishing and super-polishing [2][3][4] . On the other hand, the current experimental results indicate that microdefect and Correspondence to: Y. Xu, State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.…”

Breakdown limits of optical multimode fibers for the application of nanosecond laser pulses at 532nm and 1064nm wavelength

“…Many studies on the interaction of powerful laser pulses with fused silica surfaces have been performed during the last decades [1][2][3][4][5][6][7][8][9][10][11]. Basically, fused silica shows high laser-induced damage thresholds (LIDT) due to its large band gap ($8 eV) for an impact of laser pulses with durations down to the femtosecond scale and wavelengths ranging from the ultraviolet to the infrared.…”

“…Only a few papers were published on the influence of the existing (or even laser-induced) surface quality on LIDT [2,10,11]. Multi pulse ablation thresholds (308 nm, 33 ns) of F th % 20 J/cm 2 for polished Suprasil samples (Heraeus) with an average roughness of 2 nm and F th % 7 J/cm 2 for specimens featuring a roughness of 40 nm were reported [2].…”