This paper describe the design and construction of a electronic prototype of system control power of laser diodes, specifically the design mainly on the laser diode whose wavelength is 532 nm and the beam is visble spectrum, and the use a photodiode in the same wavelengh. Mainly the power stability of the laser diode this based on the If current flowing through the photodiode, and likewise: If the transmission power of the laser diode increased o viceversa. The power control by the user will be monitored by an interface with a microcontroller together will be used to maintain the required power using the configuration Par Differential of the bipolar transistors. Finally to through this configuration we can power control of the diode laser, varying the voltage of one of the transistors of the array

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