A laser module includes a Transmitter Optical Sub-Assembly and a heat radiating means. The clamping device has clamping rods which are arranged at least at sides of the screening element and are respectively held at a retaining bearing on a lining of a roof and at a counterbearing on a lining bordering on the lower edge of the rear window. By adjusting pH, dosing a chemical coagulant and incorporating liquid-solids separation, a considerably higher degree of TOC removal is possible. The methods disclosed herein are also useful for discovering and obtaining novel canine genes. The coupling assembly is structurally simple, has a smaller form factor, and is able to increase installation efficiency and reduce production cost.