A laser comprises a front mirror, a gain section coupled to the FM, a phase section coupled to the gain section such that the gain section is positioned between the phase section and the FM, and a back mirror comprising an interferometer and coupled to the phase section such that the phase section is positioned between the BM and the gain section. The transaction score can be used for determining a value or ranking for a company, industry or individual. A band clamp connects the first housing portion with the second housing portion. Also, a waste treatment system includes a tank having a first zone and a plurality of discrete medium-filled secondary zones, wherein undiluted waste is received in the first zone and effluent therefrom flows under gravity through the secondary zones to exit the system with effluent flow through the secondary zones being alternately upward or downward.