An optical demultiplexing device used in an optical monitoring device includes an input port and an output port unit including a plurality of ports, and separates a WDM light of plural channels, which is input from the input port, for each wavelength to output to the output port unit. A cavity is defined between the pre-tensioned padded membrane and the shell. The measuring members can be incorporated into a stability monitoring device comprising a computer-assisted evaluation electronics system. By doing so, when a transmission section is turned into an open position or a closed position, the abutment projections and the key portion are collided with each other, thereby generating a click sound. A laser irradiation apparatus comprising: a lens for dividing a laser beam in one direction; and an optical system for overlapping the divided laser beam, characterized in that the shape of the laser beam entering into the lens has edges vertical to the above-mentioned direction. A method of making a component also is described comprising obtaining a polymeric material, a liquid, a filler and a metal plating catalyst; combining the metal plating catalyst with the polymeric material, liquid, and filler to form a substantially homogeneous mixture; and evaporating andor curing the mixture to form a solidified component.