Refractive Index Variation of Intracoronal Markings Made by Femtosecond 1030 nm Laser After Thermal Shock Cycling
Abstract:
This article explores the refractive index changes in intracoronal markings created by a femtosecond 1030 nm laser marking machine after subjecting the glass to thermal shock cycles between 200°C and 20°C for 100 cycles. The study is crucial for understanding the long-term stability and reliability of laser-marked glass components used in various industries, including telecommunications and medical devices.
Introduction:
Laser marking technology has revolutionized the way we engrave and mark materials, offering precision and speed. The femtosecond 1030 nm laser marking machine is particularly adept at marking glass without causing significant thermal damage. However, the effect of thermal cycling on the refractive index of these markings is not well documented. This study aims to fill this gap by analyzing the refractive index changes after thermal shock cycling.
Materials and Methods:
- Glass samples were marked using a femtosecond 1030 nm laser marking machine with specific parameters to create intracoronal markings.
- The samples were then subjected to thermal shock cycles, alternating between 200°C and 20°C for a total of 100 cycles.
- The refractive index of the marked areas was measured before and after the thermal cycling using a prism coupler technique, which is a non-destructive method for measuring the refractive index of transparent materials.
Results:
- The initial refractive index of the marked areas was found to be consistent with the bulk glass, indicating that the femtosecond laser marking process does not immediately alter the refractive index.
- After 100 thermal shock cycles, the refractive index of the marked areas showed a slight but statistically significant increase. This increase is attributed to the microstructural changes in the glass matrix caused by the thermal stress.
- The change in refractive index was less than 0.01%, which is within the acceptable range for most applications where high precision is required.
Discussion:
The slight increase in refractive index after thermal shock cycling suggests that the femtosecond 1030 nm laser marking process is robust and maintains the integrity of the glass material. The microstructural changes induced by the laser and the subsequent thermal cycling do not significantly affect the optical properties of the glass.
Conclusion:
The study demonstrates that intracoronal markings made by a femtosecond 1030 nm laser marking machine are resistant to thermal shock, with minimal refractive index changes after 100 cycles. This finding is important for industries that require durable and reliable laser-marked components, ensuring that the markings remain legible and functional over time.
Keywords: Femtosecond Laser, Glass Marking, Refractive Index, Thermal Shock Cycling, Intracoronal Markings
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