Proceedings PaperThermal Shock: Catastrophic Failure Of Partlally Absorbing Relfelctive And Transmissive Optics In High Power Continuous Wave And Repetitive Pulsed Laser Environments
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The object of this paper is set out the expressions which will allow the evaluation of the temperature rise in real time of optical components that absorb photonic energy through to a depth which is controlled by the extinction coefficient That is, the the photons do not come out the back surface. They extinguish in the material themselves. We, of course, call that absorption. Because of the complexity of the boundary conditions, it was decided that this particular phenomena should be treated as an independent paper as opposed to being consolidated with a previous paper that dealt with similar phenomena in transmissive optics only. The equations for evaluating the temperature rise on the first surface, the back surface, and the gradient in between are provided. The temperature rise of the extinguishment zone and the partitioned zone are both treated in light of the former equations. The Reverse Thermal Wave Approximations are shown in use and examples of the application are provided. In all cases, the one dimensional, three dimensional, and radial distributions are provided for the different boundary conditions that have been enumerated. The cases are then provided with the expressions that describe the thermal shock that can result from the temperature gradients shown. Again, the equations for both metals and dielectric materials involved in thermal shock are provided with examples.