Abstract: A tunable gain coupled laser device, preferably a so called DFB-laser, includes a laser waveguide with an active material, a pump laser which emits pump light with a pumplight wavelength .lambda..sub.p and a device for orientation and direction of pumplight beams towards the waveguide. The active material in the laser waveguide is a semiconductor material and it is excited by two pumplight beams which originate from one and the same pump laser and which are directed against each other, each forming and angle of incidence with the laser waveguide.