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Table 1 Parameters of the scratches

From: Laser induced damage due to scratches in the surface of nonlinear optical crystals KH2PO4 (KDP)

  S1 S2 S3 S4 S5 S6 S7 S8 S9
Force(mN) 50 60 70 50 50 50 50 50 50
Shape ellipse ellipse ellipse triangle triangle ellipse ellipse triangle ellipse
Direction 0° 0° 0° 90° 60° 30° 0° 0° 0°
Width(μm) 10 11 12 8 9 10 10 8 10
Depth(nm) 300 400 500 300 300 300 300 900 300
Indenter spherical spherical spherical spherical spherical spherical spherical Vickers spherical
W-D ratio 33.3 27.5 24 26.7 30 33.3 33.3 8.9 33.3