A system for transmitting the spatial profile of laser beams with particular applicability to coherently combine laser beams into one beam. A fastening mechanism releasably secures the lateral and medial sidewalls together. The present invention also includes a method of selling such interchangeable modular bedding. Using the dual graph to define the dual UV set ensures that the seams corresponding to the initial UV set and the dual UV set minimally intersect. A plurality of bosses extend from an inside of the outer skirt.