Fig. 1. (a) Optical absorption of BN nanosheets dispersion in ethanol. Inset: photographs of BN nanosheets dispersion in water (left) and ethanol (right). (b) XRD patterns of BN nanosheets we used here and h-BN bulky material. Inset: the curves in the region of –. (c) TEM and (d) HRTEM images of BN nanosheets.

Fig. 2. (a) Raman-mapping image of 10wt% BN/ coating: green dots are BN nanosheets. (b) The Raman spectrum of area (1) in the mapping. (c) TEM image of 10wt% BN/ sol. Inset: TEM image of particles. (d) HRTEM image of BN nanosheets in the 10wt% BN/ sol.

Fig. 3. AFM images of (a) bare fused silica substrate, (b) coating, (c) 10wt% BN/ coating and (d) 20wt% BN/ coating.

Fig. 4. Transmittance of coating, 10wt% BN/ coating and 20wt% BN/ coating. The inset is the photograph of 10wt% BN/ coating on fused silica substrate to show the high transmittance.

Fig. 5. Laser-induced damage morphologies of AR coatings (a) coating, (b) 10wt% BN/ coating and (c) 20wt% BN/ coating.

Table 1. Optical parameters of BN/ coatings with various BN nanosheets mass ratios.