| 摘要 |
The present invention relates to a tunable gain coupled laser device, preferably a so-called DFB-laser. The device comprises a laser waveguide with an active material, a pump laser which emits pump light with a pump light wavelength .lambda.p and means for orientation and direction of pump light beams towards the waveguide. The active material in the laser waveguide is a semiconductor material and it is excited by two pump light beams which originate from one and the same pump laser and which are directed against each other, each forming an angle of incidence with the laser waveguide.
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