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 t
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.
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The invention claimed is: 1. A fiber laser comprising: a fiber for laser light generation having an entrance end and an exit end, a pump light source for generating pump light provided to be coupled via said entrance end into said fiber, and a resonator unit provided at said exit end of said fiber,
The invention claimed is: 1. A fiber laser comprising: a fiber for laser light generation having an entrance end and an exit end, a pump light source for generating pump light provided to be coupled via said entrance end into said fiber, and a resonator unit provided at said exit end of said fiber, wherein said resonator unit comprises a first resonator mirror connected with said exit end, and a second resonator mirror arranged in spaced relationship to said exit end, said second resonator mirror being adapted for feeding light of at least one wavelength range emerging at said exit end back into said fiber. 2. The fiber laser according to claim 1, wherein said first resonator mirror is highly reflecting for the wavelength range of said pump light. 3. The fiber laser according to claim 1, wherein said first resonator mirror is highly reflecting for the wavelength range with the smallest light amplification of said laser light to be generated. 4. The fiber laser according to claim 1, wherein said second resonator mirror is highly reflecting for at least one further wavelength range to which said first resonator mirror is essentially transparent such that said laser light is generated in this further wavelength range. 5. The fiber laser according to claim 1, wherein a color filter for controlling said wavelength range of said laser light to be generated is arranged upstream of said second resonator mirror. 6. The fiber laser according to claim 1, wherein said resonator unit comprises at least one further resonator mirror arranged in the beam path behind said second resonator mirror. 7. The fiber laser according to claim 6, wherein at least one further resonator mirror reflects at least one wavelength range to which said resonator mirror or said resonator mirrors arranged in the beam path upstream of said first resonator mirror are essentially transparent. 8. The fiber laser according to claim 1, wherein said resonator unit comprises a shiftable collimating lens for adjusting said wavelength range fed back into said fiber. 9. The fiber laser according to claim 1, further comprising a coupling-in mirror transparent to said wavelength range of said pump light is disposed at said entrance end of said fiber. 10. The fiber laser according to claim 9, wherein said coupling-in mirror is highly reflecting for the at least one emission wavelength range of said fiber. 11. The fiber laser according to claim 1, further comprising an optical decoupling means disposed between said pump light source and said entrance end of said fiber. 12. The fiber laser according to claim 11, wherein said optical decoupling unit comprises a polarizing means. 13. The fiber laser according to claim 12, wherein said polarizing means comprises a polarizing filter arranged downstream of said pump light source, said polarizing filter being transparent to the pump light emitted by said pump light source, and a polarization-changing means arranged downstream of said polarizing filter such that said pump light emerging from said entrance end of said fiber or pump light reflected near said entrance end is polarized such that said pump light cannot pass through said polarizing filter. 14. The fiber laser according to claim 13, wherein said polarization-changing means is a λ/4 plate. 15. The fiber laser according to claim 1, wherein said entrance end and said exit end are enclosed by a material, said material and said entrance and exit ends having a similar hardness to one another. 16. The fiber laser according to claim 1, wherein said mirrors are multilayered dielectric mirrors. 17. The fiber laser according to claim 16, wherein said multilayered dielectric mirrors comprise at least two layers formed from at least two different and alternately arranged materials. 18. The fiber laser according to claim 1, wherein said fiber is doped with between about 500 to 5,000 ppm praseodym ions. 19. The fiber laser according to claim 1, wherein said fiber is doped with between about 5,000 to 50,000 ppm Ytterbium ions. 20. The fiber laser according to claim 1, wherein the cut-off wavelength for higher waveguide modes of said fiber is between about 5% to 15% larger than the shortest laser emission wavelength. 21. The fiber laser according to claim 1, wherein a control signal is generated from the intensity of the emission power of said fiber laser which controls said emission power of said fiber laser by energizing said pump light source. 22. The fiber laser according to claim 1, wherein a gap (d) between said fiber entrance and exit ends and said first and second resonator mirrors is filled with a medium having an index of refraction near that of said fiber. 23. The fiber laser according to claim 1, wherein said fiber comprises a numerical aperture between about 0.25 to 0.35. 24. The fiber laser according to claim 2, wherein said first resonator mirror has a reflectivity is greater than 50% for the wavelength range of said pump light. 25. The fiber laser according to claim 24, wherein said first resonator mirror has a reflectivity greater than 75% for the wavelength range of said pump light. 26. The fiber laser according to claim 3, wherein said first resonator mirror has a reflectivity of between about 50% to 99.9%, such that between about 0.1% to 50% of said generated laser light wavelength range is coupled out. 27. The fiber laser according to claim 26, wherein, said first resonator mirror has a reflectivity of between about 80% to 99.1%, such that between about 0.9% to 20% of said generated laser light wavelength range is coupled out. 28. The fiber laser according to claim 18, wherein said fiber is doped with between about 2,000 to 3,000 ppm praseodym ions. 29. The fiber laser according to claim 19, wherein said fiber is doped with between about 10,000 to 30,000 ppm Ytterbium ions.
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