In this paper design and development of 780 nm stable tunable semiconductor laser is reported. Littman configuration has been used in this work. The aim of this research is to find a suitable optical set-up for tuning semiconductor lasers without moving the output laser beam. To do so, a diffractive grating, a mirror, a cooling system, a power supply and opto-mechanical components have been used. The wavelength of the laser beam and the power of that have been measured using a spectrometer and a power meter respectively. Using the typical setup the laser was tuned 52 angstrom.