{"id":215071,"date":"2026-02-05T15:38:31","date_gmt":"2026-02-05T14:38:31","guid":{"rendered":"https:\/\/www.lasit.it\/co%e2%82%82-laser-marking-at-9-3-%c2%b5m-in-eyewear-why-wavelength-makes-a-difference\/"},"modified":"2026-02-06T11:38:34","modified_gmt":"2026-02-06T10:38:34","slug":"co%e2%82%82-laser-marking-at-9-3-%c2%b5m-in-eyewear-why-wavelength-makes-a-difference","status":"publish","type":"post","link":"https:\/\/www.lasitlaser.com\/co%e2%82%82-laser-marking-at-9-3-%c2%b5m-in-eyewear-why-wavelength-makes-a-difference\/","title":{"rendered":"CO\u2082 laser marking at 9.3 \u00b5m in eyewear: why wavelength makes a difference"},"content":{"rendered":"\n

When it comes to laser marking on cellulose acetate and polycarbonate for ophthalmic frames, the choice of laser technology is not trivial. In recent years, alongside conventional CO\u2082 lasers operating at 10.6 \u00b5m, a CO\u2082 laser operating at 9.3 \u00b5m has emerged-a seemingly minor difference, but one with significant repercussions on marking quality. In this article we look at why this wavelength variation has become the preferred choice in the professional eyewear industry, without going into investment or payback talk, but focusing on concrete technical and application aspects. <\/p>\n\n

Why 9.3 \u00b5m instead of 10.6 \u00b5m?<\/h2>\n\n

The difference between the two CO\u2082 lasers lies in the wavelength of the emitted infrared radiation. The standard CO\u2082 laser works at 10.6 \u00b5m, while the 9.3 \u00b5m CO\u2082 laser exploits a different vibrational transition of the CO\u2082 molecule. From a practical point of view, the main effect is the minimum achievable laser spot size and, consequently, the fineness of the etched line. <\/p>\n\n

\"Occhialeria_Dettaglio-astina-occhiali-plastica-2500x1741<\/figure>\n\n

With the 9.3 \u00b5m laser, the spot is inherently smaller for the same optical configuration, allowing finer lines and finer details to be drawn. This translates into better definition of alphanumeric characters, logos, and decorative markings-a key issue when working on high-end frames, where the branding must be legible, sharp, and unobtrusive without being obtrusive or coarse. <\/p>\n\n

Materials involved<\/h2>\n\n

In eyewear, the most common plastic materials are:<\/p>\n\n

    \n
  • Cellulose acetate<\/strong>: used for mid- to high-end frames; offers good workability and aesthetic flexibility.<\/li>\n\n\n\n
  • Polycarbonate<\/strong>: mainly used for sports frames and lenses; lightweight and impact resistant.<\/li>\n\n\n\n
  • Other polymers<\/strong>: nylon, TR90, grilamid, less frequent but present in specific niches.<\/li>\n<\/ul>\n\n

    All these materials absorb CO\u2082 radiation well, but the aesthetic quality of the marking depends strictly on the precision of the laser spot. The 9.3 \u00b5m laser, due to its shorter wavelength, concentrates energy on a smaller area, reducing the diffuse thermal effect and improving the sharpness of the mark. <\/p>\n\n

    \"Occhialeria_Dettaglio_laterale_plastica<\/figure>\n\n

    Concrete applications in the eyewear industry<\/h2>\n\n

    Model code and size marking<\/h3>\n\n

    Each frame bears, usually on the inside of the rod, a set of information: brand name, model, size (gauge-bridge-rod), and color code. These characters must be legible but at the same time unobtrusive. With the 9.3 \u00b5m laser, it is possible to mark alphanumeric characters with a height of 1.5-2 mm while maintaining excellent legibility, without excessive burning or smearing that would compromise the aesthetics of the product. <\/p>\n\n

    Marking of logos and trademarks<\/h3>\n\n

    Luxury brands require faithful logo reproduction even on curved or small surfaces. The finer stroke of the 9.3-\u00b5m laser allows complex details-such as fine graces, decorative elements or serifs-to be reproduced without loss of definition. This is especially important for brands that focus on visual identity and brand consistency on every component of the frame. <\/p>\n\n

    \"Occhialeria__Aste-metalliche<\/figure>\n\n

    Custom decorations and patterns<\/h3>\n\n

    Some handcrafted or high-end eyewear manufacturers offer the option of customizing temples with decorative engravings, customer initials or geometric patterns. The 9.3-\u00b5m laser allows for continuous lines, smooth curves and sharp transitions without the risk of excessive charring or dull areas around the engraved line. <\/p>\n\n

    2D code marking for internal traceability<\/h3>\n\n

    In some cases, especially in industrial production settings, a Datamatrix marking of a small size (4\u00d74 mm or less) is required for lot or individual part traceability. Again, the laser spot accuracy of 9.3 \u00b5m helps to achieve well-defined code forms, improving the read rate and reducing the risk of errors during automatic verification. <\/p>\n\n

    \"occhiali-marcatura-laser-con-datamatrix<\/figure>\n\n

    Why is the 30 W used almost exclusively?<\/h2>\n\n

    In the eyewear industry, the most popular laser power is 30 W. This is because:<\/p>\n\n

      \n
    • Adequate speed<\/strong>: A 30 W laser enables the marking of characters and logos in times compatible with medium-to-high production cycles (up to several hundred frames per day), without compromising on quality.<\/li>\n\n\n\n
    • Thermal control<\/strong>: higher powers (50 W or more) would increase speed, but make control of the thermal effect more critical, with risk of surface deformation or localized burns, especially on thin materials such as acetate rods.<\/li>\n\n\n\n
    • Balance between cost and performance<\/strong>: the 30 W represents a technical balance point, allowing for a fine, clean stroke without the need for extreme operating frequencies or complex cooling systems.<\/li>\n<\/ul>\n\n

      Lower powers (e.g., 10 W or 20 W) can be used for very limited machining or small-scale craft applications, but are not sufficient to ensure acceptable cycle times in structured production settings.<\/p>\n\n

      Typical process parameters<\/h3>\n\n

      Without going into too much technical detail, the parameters of marking on cellulose acetate with 30 W 9.3 \u00b5m CO\u2082 laser generally settle on:<\/p>\n\n

        \n
      • Pulse repetition frequency<\/strong>: 5-20 kHz, depending on the detail required.<\/li>\n\n\n\n
      • Scanning speed<\/strong>: 200-800 mm\/s, depending on the desired engraving depth.<\/li>\n\n\n\n
      • Effective power<\/strong>: 10-30% of rated power, modulated to avoid excessive carbonization.<\/li>\n\n\n\n
      • Number of passes<\/strong>: usually 1, rarely 2, to keep the aesthetic effect clean.<\/li>\n<\/ul>\n\n

        On polycarbonate, the parameters are similar, but with special attention to heat management to avoid thermal stress phenomena that could cause micro-cracking.<\/p>\n\n

        Comparison with other laser technologies<\/h2>\n\n

        Fiber laser<\/h3>\n\n

        Fiber lasers (1064 nm) are very effective on metals, but on non-additive plastics they tend to leave poorly contrasted marks or require specific additives. In the eyewear industry, where aesthetic materials are worked on and the polymer compound cannot always be modified, the CO\u2082 laser remains the dominant choice. <\/p>\n\n

        \"Occhialeria_Logo-su-occhiali-da-sole<\/figure>\n\n

        Laser UV<\/h3>\n\n

        The UV laser (355 nm) offers “cold” marking with a photochemical effect, which is particularly suitable for heat-sensitive plastics. However, for applications on acetate and polycarbonate in the context of eyewear, the 9.3-\u00b5m CO\u2082 laser provides a good compromise between quality, speed, and material handling, without the need to invest in more expensive UV sources with shorter lifetimes. <\/p>\n\n

        Critical issues to consider<\/h2>\n\n

        Geometric tolerances<\/h3>\n\n

        Mount rods can have varying curvatures and thicknesses. It is important that the marking system include a motorized Z-axis to compensate for height variations and keep the laser spot in focus at all times. Some systems also integrate a laser autofocus system to verify the correct focal distance in real time. <\/p>\n\n

        Smoke management<\/h3>\n\n

        Laser marking on cellulose acetate generates fumes containing organic derivatives. An effective vacuum system, possibly with activated carbon and HEPA filters, is essential to keep the focusing optics clean and ensure a healthy working environment. <\/p>\n\n

        \"Filtri<\/figure>\n\n

        Centering the marking<\/h3>\n\n

        To ensure that logos and codes are positioned correctly on the rod, it is advisable to use loading jigs or, alternatively, vision systems that automatically detect the position of the part and adjust the marking layout accordingly.<\/p>\n\n

        Inline integration or stand-alone station?<\/h3>\n\n

        In the eyewear industry, laser marking is often performed on a stand-alone station, with manual or semi-automatic loading. In more structured production settings, the laser can be integrated into the line after the assembly and polishing stages, with belt or pallet transport systems and automatic loading\/unloading. In either case, the flexibility of the 9.3-\u00b5m CO\u2082 laser allows it to adapt to variable production volumes and even small batches, without the need for complex reconfiguration. <\/p>\n\n

        \"occhiali-dima<\/figure>\n\n

        Conclusions<\/h2>\n\n

        The choice of the 9.3-\u00b5m CO\u2082 laser in the eyewear industry is not accidental, but meets precise requirements for aesthetic quality, line definition and thermal control on delicate plastics. Compared to the conventional 10.6-\u00b5m CO\u2082 laser, the shorter wavelength allows for a finer spot, resulting in sharp, discreet markings that meet the aesthetic standards required by high-end brands. <\/p>\n\n

        The 30 W power is the optimal balance point for balancing marking speed and result quality, allowing it to work effectively on cellulose acetate, polycarbonate and other polymers without compromising material integrity. Whether it is for pattern codes, logos, decorations or 2D codes for traceability, the 9.3 \u00b5m CO\u2082 laser proves to be the technology of choice for an industry that does not allow compromises on the precision and aesthetics of the finished product. <\/p>\n","protected":false},"excerpt":{"rendered":"

        CO\u2082 laser at 9.3 \u00b5m in eyewear: because the finer spot ensures sharp markings on acetate and polycarbonate, and because 30 W is the ideal power.<\/p>\n","protected":false},"author":9,"featured_media":214993,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9252],"tags":[9782],"menu-item":[],"class_list":["post-215071","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laser-applications","tag-fashion"],"acf":[],"yoast_head":"\n9.3\u00b5m CO2 laser in eyewear - Benefits and Applications<\/title>\n<meta name=\"description\" content=\"CO\u2082 laser at 9.3 \u00b5m in eyewear: because the finer spot ensures sharp markings on acetate and polycarbonate, and because 30 W is the ideal power.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lasitlaser.com\/co%e2%82%82-laser-marking-at-9-3-%c2%b5m-in-eyewear-why-wavelength-makes-a-difference\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CO\u2082 laser marking at 9.3 \u00b5m in eyewear: why wavelength makes a difference\" \/>\n<meta property=\"og:description\" content=\"CO\u2082 laser at 9.3 \u00b5m in eyewear: because the finer spot ensures sharp markings on acetate and polycarbonate, and because 30 W is the ideal power.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.lasitlaser.com\/co%e2%82%82-laser-marking-at-9-3-%c2%b5m-in-eyewear-why-wavelength-makes-a-difference\/\" \/>\n<meta property=\"og:site_name\" content=\"LASIT - 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