The present invention has the object of providing a charged particle beam irradiation method ideal for reducing the focus offset, magnification fluctuation and measurement length error in charged particle beam devices. Generally, biomolecular sequence information may be graphically depicted in a variety of different forms in accordance with the present invention. Gain for the source may be provided by a semiconductor device that provides linearly-polarized pump light. One clock signal is directed to the phase locked loop and the other clock signal is directed to a downstream transceiver. The network controller may be configured to determine a network path comprising the at least one network interface that has a lowest power consumption of available media types coupled to the at least one PHY.