532nm green laser so finely engraving wine glass LOGO The wavelength of the green laser is 532nm, and its small wavelength determines that it has high beam quality, small spot size, and can achieve the ultra-fine marking requirements of glass products. Its minimum character can reach 0.02mm.   The 532nm green laser marking developed and produced by RFH can clearly engrave the required text and pattern on the surface of the red wine glass.