Avoiding Membrane Delamination and Contrast Degradation in Serial Number Marking on Anti-Reflection Coated Glass with 1064 nm Picosecond Laser
Abstract:
The application of 1064 nm picosecond laser marking technology on anti-reflection coated glass for serial number engraving presents unique challenges due to the complexity of the glass surface and the need to maintain the integrity of the coating. This article discusses the optimal parameters and techniques required to avoid membrane delamination and contrast degradation, ensuring high-quality and durable markings.
Introduction:
Anti-reflection (AR) coated glass is widely used in various applications, including optical devices and display screens, to minimize light reflection and enhance transmission. Marking such surfaces with a 1064 nm picosecond laser requires careful consideration of the laser's interaction with the AR coating to prevent damage and maintain readability. This article explores the energy density, pulse duration, and other critical factors that influence the marking process.
Energy Density and Pulse Duration:
The energy density of the 1064 nm picosecond laser plays a crucial role in the marking process. Too high an energy density can cause the AR coating to delaminate or the glass to crack, while too low may result in insufficient marking contrast. Experiments have shown that an energy density of 0.1 to 0.5 J/cm² is effective for marking without damaging the coating. Additionally, the short pulse duration of picosecond lasers (typically in the range of picoseconds) allows for precise control over the interaction with the glass surface, minimizing heat-affected zones and stress-induced fractures.
Optimization of Marking Parameters:
To achieve optimal marking results on anti-reflection coated glass, a meticulous adjustment of the laser marking parameters is necessary. This includes the laser's power, repetition rate, and scan speed. A lower repetition rate combined with a higher single-pulse energy can lead to better marking quality by allowing more time for heat dissipation between pulses, thus reducing the risk of thermal damage to the coating.
Substrate Temperature Control:
Controlling the substrate temperature is another key factor in the successful marking of anti-reflection coated glass. Elevated temperatures can reduce the thermal shock experienced by the glass during laser processing, thereby decreasing the likelihood of coating delamination. However, the temperature must be carefully managed to avoid altering the optical properties of the AR coating.
Laser Beam Quality and Focus:
The quality of the laser beam and its focus are also critical. A high-quality beam with minimal aberrations ensures that the energy is evenly distributed across the focal spot, leading to consistent marking quality. The focus of the laser should be adjusted to penetrate the coating without affecting the underlying glass, which requires precise control over the focus depth.
Conclusion:
In conclusion, marking serial numbers on anti-reflection coated glass with a 1064 nm picosecond laser is a delicate process that requires a balance of energy density, pulse duration, substrate temperature, and laser beam quality. By carefully optimizing these parameters, it is possible to achieve high-contrast, durable markings without causing damage to the AR coating or the glass substrate.
Note: The specific energy density values and marking parameters mentioned in this abstract are illustrative and should be tailored to the specific type of anti-reflection coated glass and the laser marking machine used. Further experimentation and process optimization may be required to achieve the best results for a given application.
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