Tunable laser device

The invention discloses a tunable laser device which comprises a semiconductor refrigerator, a transitional heat sink, a laser device array chip, a micromotor, an optical fiber, a first splitter, a mode switcher, a single mode fiber, a second splitter, a wavelength locker, an optical detector, a laser device array chip drive circuit, a temperature control circuit, a micromotor drive circuit and a microprocessor. A sliding block capable of moving in the stoke direction of the micromotor is arranged on the micromotor, the optical fiber is fixed to the sliding block of the micromotor, the end, fixedly connected with the sliding block, of the optical fiber is a laser incoming end, and the other end of the optical fiber is connected with the mode switcher. The first splitter is connected with the mode switcher and the second splitter through the single mode fiber, and the other end of the second splitter is further connected with the wavelength locker and the optical detector. The transitional heat sink is fixed to the top of the semiconductor refrigerator, and the laser device array chip is fixed to the top of the transitional heat sink. The tunable laser device has the advantages of being low in power consumption, high in precision, low in cost and the like.