I am simulating the laser heating of a structure using the formula
to take into account the Reflection at the surface
, the absorption of each material 
and a flat-top intensity distribution given by 
The structure consists of a narrow slot (actual image of the structure: 1).
As it can be seen in the image the slot(red) is filled with a material with thermal conductivity 
and it is surrounded with a material(blue) with a thermal conductivity 
at the bottom there is another material with thermal conductivity 
and whose lower boundary is kept at 
. Red and blue materials have the same absorption coefficient 
.
What I found strange about the simulation is I get a Temperature profile at the surface of the structure where the laser heating occurs with a very big temperature peak at the position of the slot (image:2 ).
Could this be because of a problem with the boundary conditions or the meshing or could it even be correct?
Thanks if anyone can help.