With the pervasive use of high-power lasers in industrial applications, the need to achieve technologies related to this precision and powerful tool is felt more than ever. Providing high quality electrical power for laser diodes with optimal efficiency is one of the basic essentials of a fiber laser system. The quality of light emitted from semiconductor parts such as light emitting diodes (LED) or Laser diodes (LD) is fully proportional to the quality of its power supply. The subject of this dissertation is the research, design and implementation of power supply for industrial lasers in two k W output electrical power, and for the 3kW laser, a power supply with 10kW output electrical power is required. In this dissertation , after examining the voltage and current levels of some commercial laser diodes samples for fiber laser cavity pumping, the load arrangement is designed and the required power supply characteristics are determined. The 10kW modular power supply is provided with ten full-bridge converters (in two ways: hard-switching full-bridge and soft switching series resonant converter). For the lower power demand, a phase-shifted soft switching converter with 2 kW output power is designed and implemented. In these power supplies, it is possible to adjust the output voltage and current level. To improve the important factors mentioned in international standards for power supplies, such as power factor correction and reduction of electromagnetic interference, a review of articles on these topics are presented. A new single switch soft switching power factor correction converter with 89% maximum efficiency and 0.98 power factor is presented and implemented. For feeding parallel strings of laser diodes, another converter is presented which uses coupled inductors at the output stage of the soft switching series resonant power factor correction converter. This converter is also implemented and the results indicate that maximum efficiency of 93% and power factor of 0.99 is achieved. Key Words Fiber Laser Power supply, LED Driver, Laser Diode Driver, Power Factor Correction, Series Resonant Converter, Phase Shift Converter