Image of secondary electrons from a fine structure at the edge of a hole taken with a scanning electron microscope Helios Nanolab 600 (FEI Company). The hole was shot into the wood veneer using a 40W CO2 laser. The fibrous structure of the wood is well visible in the picture, which is due to the good depth of field of the scanning electron microscope, which is an advantage of this method over optical microscopy. The picture was taken in the framework of studying materials characterization methodologies in the film technology laboratory of the Institute of Physics of the University of Tartu. For better image visualization, various surfaces have been painted with image processing, where dark blue is the surface where veneer is  attached to and brown is the wood itself.
<a href="//commons.wikimedia.org/wiki/User:Kent_Gregor_Mahla" title="User:Kent Gregor Mahla">Kent Gregor Mahla, Maido Merisalu</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>