Laser engraving of photographs on wood surfaces is a challenging task. To optimize the outcome and production quality it is necessary to control every aspect of the laser engraving process. Most of the production machines and technologies overall are mainly focused on laser power control. However, with other systems and deeper knowledge of the wood characteristics it is possible to achieve even better quality. This paper deals with enlarging the number of achievable shades of burned wood and its optimization. A calibration system was developed to control colour shades of engraved wood with a combination of laser power and optic focus. With this approach it is possible to widen achievable palette of engraved shades by continuous control of chemical processes of laser and wood interaction. The production is divided into wood burning and wood carbonization by variation of laser beam focus.

在木质表面上激光雕刻照片是一项艰巨的任务。为了优化结果和生产质量，必须控制激光雕刻过程的每个方面。总体上，大多数生产机器和技术主要集中在激光功率控制上。但是，通过其他系统和对木材特性的更深入了解，有可能获得更高的质量。本文讨论了增加可燃烧木材的阴影数量及其优化方法。开发了一种校准系统，以结合激光功率和光学聚焦来控制雕刻木材的色调。通过这种方法，可以通过连续控制激光和木材相互作用的化学过程来扩大雕刻阴影的调色板。