Abstract
Increasing the lens focal length reduces statistical variability and allows a more accurate determination of the LIDT of materials. Thus, we used a 400mm focal length lens with antireflection coatings on both surfaces. The spot size of the beam incident on the sample was 90 ± 10μm diameters at 1/e of the maximum intensity that is located 12mm behind the front face of the sample to prevent surface damage and minimize the influence of self-focusing and stimulated Brillouin scattering (SBS). Damage locations were laterally separated by about 1mm.
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