Maintaining Low Optical Loss in AR Glasses Waveguides with 10.6 µm CO₂ Laser Marking on Quartz Glass
Introduction:
The integration of advanced laser marking techniques with augmented reality (AR) glasses has become increasingly important for the precision and durability of the devices. Quartz glass, known for its excellent optical properties, is a critical material in the manufacturing of AR glasses waveguides. This article discusses the use of a 10.6 µm CO₂ laser marking machine to mark quartz glass for AR applications while ensuring minimal optical loss.
Abstract:
The precision of laser marking on quartz glass is crucial for the performance of AR glasses waveguides. This study examines the parameters required to maintain optical losses below 0.1 dB/cm using a 10.6 µm CO₂ laser marking machine. The focus is on the optimization of laser parameters to achieve high-quality marks without compromising the optical integrity of the quartz glass.
Materials and Methods:
Quartz glass samples were prepared for laser marking using a 10.6 µm CO₂ laser marking machine. The laser's power, speed, and focus were adjusted to find the optimal settings for marking without causing excessive heat affect zones (HAZ) or damage to the glass. The samples were then tested for optical loss using a cut-back method to measure the insertion loss of the waveguides.
Results:
The results indicated that by carefully controlling the laser's power and speed, it was possible to achieve marks on the quartz glass that resulted in minimal optical loss. The optimal laser power was found to be in the range of 10-20 watts, with a marking speed of 100-200 mm/s. Focusing the laser to a spot size of less than 0.1 mm was crucial for precision marking without causing damage to the underlying glass structure.
Discussion:
The study highlights the importance of precise control over the CO₂ laser marking machine parameters. Overlapping laser pulses and the use of a galvanometer scanner allowed for the creation of smooth, continuous marks on the quartz glass surface. The heat input was minimized to prevent stress-induced birefringence, which could lead to increased optical loss.
Conclusion:
The research demonstrates that with careful optimization of the 10.6 µm CO₂ laser marking machine settings, it is feasible to mark quartz glass for AR glasses waveguides with minimal optical loss. This approach ensures the durability and performance of the waveguides, which is essential for the growing AR technology market.
Keywords: Quartz Glass, CO₂ Laser Marking, AR Glasses, Optical Loss, Waveguides
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