Influence of Focus Step Size on the Readability of QR Codes Inscribed in Glass with a 1030 nm Femtosecond Laser Marking Machine
Abstract:
The readability of QR codes inscribed in glass using a 1030 nm femtosecond laser marking machine is significantly influenced by the focus step size. This study investigates the effects of two different focus step sizes, 5 µm and 20 µm, on the readability and error rates of QR codes inscribed in glass.
Introduction:
Femtosecond lasers have revolutionized the field of material processing due to their precision and minimal heat-affected zones. In the context of glass marking, the 1030 nm femtosecond laser marking machine is particularly effective for inscribing high-resolution QR codes. The focus step size, a critical parameter in laser marking, determines the depth and clarity of the inscription. This study aims to assess how different focus step sizes impact the readability and error rates of QR codes inscribed in glass.
Materials and Methods:
- Sample Preparation: Standard glass slides were used as the substrate for QR code inscription.
- Laser Marking Parameters: A 1030 nm femtosecond laser marking machine was employed with a pulse duration of 200 fs and a repetition rate of 100 kHz. The laser power was adjusted to achieve optimal marking without causing damage to the glass.
- Focus Step Sizes: Two focus step sizes were tested: 5 µm and 20 µm. The laser was focused to a spot size of approximately 30 µm in diameter.
- QR Code Inscription: Standard QR codes were inscribed on the glass slides using the laser marking machine. Each code was inscribed in triplicate for both focus step sizes.
- Readability and Error Rate Analysis: Post-inscription, the QR codes were scanned using a commercial QR code reader to assess readability. Error rates were recorded and compared between the two focus step sizes.
Results:
- Readability: The QR codes inscribed with a 5 µm focus step size were consistently more readable than those inscribed with a 20 µm step size. The higher resolution achieved with the smaller step size resulted in clearer and more distinct markings, which improved the readability of the QR codes.
- Error Rates: The error rates were significantly higher for QR codes inscribed with a 20 µm focus step size compared to those inscribed with a 5 µm step size. The larger step size led to more diffuse markings, which increased the likelihood of misinterpretation by the QR code reader.
Discussion:
The smaller focus step size of 5 µm provided a higher level of detail in the inscription process, leading to clearer QR codes with lower error rates. The 20 µm step size, while still capable of inscribing QR codes, resulted in a more blurred and less distinct pattern, which increased the error rate during scanning. This suggests that for applications requiring high accuracy and minimal error rates, a smaller focus step size is preferable.
Conclusion:
The focus step size in femtosecond laser marking has a significant impact on the readability and error rates of inscribed QR codes in glass. A 5 µm focus step size is recommended for applications where high readability and low error rates are critical. Further studies could explore the optimal laser parameters for different glass types and QR code complexities to maximize the efficiency and accuracy of laser marking.
Acknowledgments:
The authors would like to acknowledge the support of the [Institution Name] for providing the facilities and equipment necessary to conduct this study.
References:
[Please include relevant scientific articles, books, or other resources that were used in the study or that provide additional context for the findings.]
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*Note: The above article is a fictional example and does not contain real data or results. It is intended to provide a structured outline for an article on the topic of focus step size's influence on QR code readability in glass using a femtosecond laser marking machine.*
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