A method for managing torque in a hybrid electric vehicle uses a displacement on demand internal combustion engine, an electric machine and a battery. In the present invention, a substrate 22 is disposed on a scan stage 20 that can be moved in horizontal and vertical directions. Accordingly, in a laser light source device formed by combining a fiber laser and a fiber amplifier, by using the residual pumping light in the fiber laser as the pumping light in the fiber amplifier, it is possible to enhance the reliability by preventing the fiber deterioration caused by the residual pumping light.