An Exploratory Study of Laser Scribing Quality through Cross-Section Scribing Profiles

Area of Science:

• Materials Science
• Manufacturing Engineering
• Optical Metrology

Background:

• Traditional laser scribing quality assessment relies on simple width and depth measurements.
• These methods lack the precision to capture complex profile variations and ensure consistency.

Purpose of the Study:

• To develop a novel, quantitative method for evaluating laser scribing quality using 3D optical profiler data.
• To introduce new metrics for assessing scribing accuracy and consistency.
• To identify optimal laser parameters for improved scribing quality.

Main Methods:

• Utilized a 3D optical profiler to generate over 1370 cross-section profiles.
• Applied a cubic spline model to represent scribe cross-section profiles.
• Developed response surface polynomial models for Ratio of Actual to Target Area (RA) and Mean Square Error (MSE).
• Employed contour plots and Pareto optimization for simultaneous analysis of RA and MSE.

Main Results:

• Demonstrated that cubic spline models accurately represent laser scribe cross-sections.
• Identified pulse energy and repetition rate as dominant laser parameters influencing RA and MSE.
• Established a Pareto front for optimizing laser scribing quality, balancing accuracy and consistency.

Conclusions:

• The proposed method offers a more comprehensive evaluation of laser scribing quality.
• Accurate control of laser parameters like pulse energy and repetition rate is crucial for optimal scribing.
• The developed models and optimization techniques provide a pathway to enhanced laser scribing precision.