Abstract: A diode laser pumped, power stabilized fiber laser comprising a doted fiber, a pumping light source, as well as entrance and exit side resonator units wherein the entrance resonator unit and/or the exit resonator unit have controllable distances (gaps) to the fiber end faces, which are up to 20 ?m wide. A controllable variation of the gap widths allows for the generation of light emission on a plurality of switchable and simultaneously excited emission wavelengths in the visible and the near infrared ranges.

Abstract: A fiber laser with a fiber for laser light generation having an entrance end and an exit end comprises a pump light source for generating pump light to be coupled via the entrance side into the fiber. At the exit end of the fiber a first resonator mirror is provided which is highly reflecting for the laser light to be generated in the wavelength range with the smallest light amplification and to the light of the pump light source. Spaced from the first resonator mirror a second resonator mirror is provided via which light of further wavelength ranges can be fed back into the fiber with the aid of a collimating lens.

Abstract: A fiber laser with a fiber (16) for laser light generation having an entrance end (14) and an exit end (20) comprises a pump light source (10) for generating pump light to be coupled via the entrance side (14) into the fiber (16). At the exit end of the fiber (16) a first resonator mirror (26) is provided which is highly reflecting for the laser light to be generated in the wavelength range with the smallest light amplification and to the light of the pump light source (10). Spaced from the first resonator mirror (26) a second resonator mirror (28) is provided via which light of further wavelength ranges can be fed back into the fiber (16) with the aid of a collimating lens (30).