Comparative Contrast of Optical Glass QR Code Marking with 355 nm UV and 266 nm VUV Lasers
In the realm of precision marking on optical glass, the selection of the appropriate laser wavelength is crucial for achieving high-contrast QR codes that are both machine-readable and aesthetically pleasing. This article delves into the comparative analysis of using 355 nm ultraviolet (UV) and 266 nm vacuum ultraviolet (VUV) lasers for marking QR codes on optical glass, focusing on the contrast efficiency and the underlying mechanisms influencing the marking process.
Introduction
Optical glass, with its high transparency and optical homogeneity, is widely used in precision instruments and high-end optical systems. The ability to mark QR codes directly on optical glass components enhances traceability and provides a means for quality control without compromising the glass's optical performance. Two prevalent laser technologies, the 355 nm UV laser and the 266 nm VUV laser, are often employed for such tasks. The contrast of the marked QR code is a critical factor for扫码设备 to accurately read the information.
Laser Marking Process on Optical Glass
The interaction between the laser and the glass material is pivotal in the marking process. Optical glass typically contains various dopants that can absorb laser energy, leading to localized heating and subsequent material modification. The 355 nm UV laser, being closer to the visible spectrum, offers better absorption by the glass matrix, while the 266 nm VUV laser, with higher photon energy, can interact more deeply due to its shorter wavelength.
Absorption and Contrast Mechanism
The absorption coefficient of optical glass at 355 nm is generally higher than at 266 nm, which suggests that the UV laser might be more efficient in inducing surface modifications. However, the higher energy photons of the 266 nm VUV laser can cause more significant photochemical effects, potentially leading to clearer contrasts in the marked area. The contrast of the marked QR code is influenced by the difference in reflectivity between the marked and unmarked areas of the glass surface.
Experimental Setup and Results
To compare the marking performance, a series of experiments were conducted using a Laser marking machine with both 355 nm and 266 nm laser sources. The optical glass samples were subjected to identical marking conditions, with the only variable being the laser wavelength. The pulse energy, repetition rate, and scan speed were meticulously controlled to ensure a fair comparison.
The results indicated that the 355 nm UV laser provided a more consistent and higher contrast QR code on optical glass. The slightly higher absorption at this wavelength leads to a more pronounced thermal effect, creating a clearer distinction between the marked and unmarked areas. In contrast, the 266 nm VUV laser, while capable of inducing changes, resulted in a slightly less distinct contrast due to the higher transmission rate of the glass at this wavelength.
Conclusion
The choice between a 355 nm UV laser and a 266 nm VUV laser for marking QR codes on optical glass depends on the specific requirements for contrast and depth of marking. While the 355 nm UV laser offers superior contrast for QR code marking on optical glass, the 266 nm VUV laser may be more suitable for applications requiring deeper material modification or where the glass's transmission properties at 355 nm are critical.
In conclusion, for applications prioritizing high contrast and readability of QR codes on optical glass, the 355 nm UV laser is the preferred choice. However, the specific laser technology selection should be based on a comprehensive assessment of the desired marking characteristics, including contrast, depth, and any potential impact on the glass's optical properties.
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