In order to study the linewidth-matching in rubidium vapor laser,a single emitter laser diode with narrow linewidth and wide tunable range has been designed based on temperature control with TEC (Thermo electronic cooler).According to the LD′s temperature drift characteristics,the LD′s central wavelength is around 780 nm(the operation temperature is -6 ℃).Adopting the volume Bragg grating (VBG),the laser power is 1.448 W and linewidth is 0.13 nm.By adjusting the temperatures of the VBG,the central wavelength can be tuned from 779.28 nm to 780.13 nm.The tunable range is 850 pm.