Laser trimmer Cutting, welding, marking of lasers are increasing industrial fields now. Diode pumped lasers are most useful lasers for these applications of processing of a metal, semiconductor material, electronic devices and measurement devices. Main materials are a metal, acrylic, wood, thin film, plastic, polymer, and PCB circuit board. This laser trimmer is designed for controlling a VCO device through diode pumped Green laser which is developed by Golden Light company. VCO(Voltage Control Oscillator) is used for deriving a requested frequency to change the features of resistance and inductance on a circuit board. Laser Trimmer is a machine for trimming the narrow part of a circuit board to derive the frequency within the region of errors. Mainly this trimmer is developed for precisely controlling the frequency source of many devices such as PCS in wireless communication, Cellular phones, and Relay. This figure shows the trimming of VCO circuit boards through trimming machine by Green lasers, developed by Golden Light company. Laser scanners are focusing laser beams to the specified position. ¡á Laser Trimmer System