Table 1 Comparison of the performance (percentages of events recorded) with and without the focus tracking system.

From: Focus Tracking System for Femtosecond Laser Machining using Low Coherence Interferometry

Focus Tracking

All data values

Excluding “Unclassified”

S < 1 CP

1 CP < S < 2 CP

2 CP < S

Unclassified

S < 1 CP

1 CP < S < 2 CP

2 CP < S

Enabled

56%

12%

4%

28%

79%

16%

6%

Disabled

8%

6%

29%

56%

18%

15%

68%

  1. Data was divided into groups according to surface position (S) being recorded within one confocal parameter (S < 1 CP); between one and two CP (1 CP < S < 2 CP); and outside 2 CP (2 CP < S). Unclassified events happened when the system could not properly locate the surface.
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