The newly developed method provides a faster and more efficient way for producing gratings - by ablation of small amounts of material - on glass surfaces. Thereby, the economic labeling of glass with patterns causing diffraction becomes possible. These patterns shimmer in different colors if observed from different angles.

(Image: A micrometer scaled grating on a glass surfaces causes diffraction and creates a colorful and shimmering structure. (Source: Dr. Jürgen Ihlemann, LLG) )

According to the above mentioned challenges, the aim of the inventors was to develop a method for fast and efficient microstructuring of glass.
The developed process uses plane laser ablation by excimer lasers, however, with low-loss optical components and methods. The whole beam profile of the laser is being used, resulting in higher laser output and increased efficiency and contrast. With the newly developed method it is now possible to move the workpiece continuously, as needed in industrial production or processing. Laser pulses are triggered whenever the workpiece has moved by one or multiple periods of the desired grating. Additional devises that create a relative movement between the laser and the workpiece, e.g. a scanner, are not required. If the grating has to be tilted towards the feed direction, only the increment between two pulses has to be adjusted to the line distance in feed direction. Optimally, the maximal repetition rate of the laser can be used.
With this process, it is now possible to produce gratings on a micrometer scale within a very short time frame on workpiece surfaces - especially glass surfaces. The produced structure can fill a predefined shape. The resulting shape then appears colorful and shimmering, similar to what is known from holographic markings. Alternatively, it can be used to define the wavelength-dependent reflection or transmission of a surface.

 How to solve this problem? Read More at MBM ScienceBridge here