Abstract
A technique for creating renewable reflective optics suitable for focusing of pulsed laser beams is proposed. It is based on the heating of the surface of a planar reflecting slab by an auxiliary heating source that causes thermal expansion of the slab material and creates a desired surface relief, e.g., a focusing mirror. The presence of this relief is a transient phenomenon, but, for a short-enough main pulse, this does not cause any problems. If the surface is damaged by the main pulse, the shifting of the slab and repeating the whole cycle allows recreating the transient mirror. Favorable features of this approach include controlling the optics “at a distance,” without any direct mechanical contact. A detailed discussion of the possibilities provided by this technique for the focusing of x-ray beams at the planned Linac Coherent Light Source facility at Stanford is presented. It is concluded that a 20-fold increase of intensity of an 8 keV beam and 100-fold increase of intensity of a 0.8 keV beam is possible. A set of design equations and constraints is formulated. The analysis presented can be used as a template for analyses of similar transient optical systems for the UV and optical range.
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