Abstract: A folded slab waveguide laser having a hybrid waveguide-unstable resonator cavity. Multiple slab waveguides of thickness ‘t’ supporting vertical waveguide modes are physically arranged above one another in a stack and optically arranged in series through one or more cavity folding assemblies with curved mirrors. A gain medium such as a gas is arranged in each slab. Each cavity folding assembly is designed to redirect the radiation beam emitted from one slab waveguide into the next waveguide and also at the same time to provide a focus for the radiation beam so that a selected vertical waveguide mode (or modes) is (or are) coupled efficiently into the next slab.

Abstract: A method of processing a transaction includes receiving a site location code. Site configuration information corresponding to the received site location code is received from a database. That information includes more product record(s), each corresponding to a reservable product or a non-reservable product. A selection of one or more of the product records in the retrieved information is received. If any selected product record corresponds to a reservable product, a reservation command is produced. That command requests reservation of selected reservable product(s). A method of selecting a product includes receiving a location input and determining a site location code with it. The site location code is transmitted and one or more product records are received. Representations of one or more of the received product records are presented and a selection of products is received. An indication of the selection is transmitted.