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      Doping management for high-power fiber lasers: 100 W, few-picosecond pulse generation from an all-fiber-integrated amplifier

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      Author
      Elahi, P.
      Yilmaz, S.
      Akçaalan, Ö.
      Kalaycioğlu, H.
      Öktem, B.
      Şenel, Ç.
      Ilday, F. Ö.
      Eken, K.
      Date
      2012-07-16
      Source Title
      Optics Letters
      Print ISSN
      0146-9592
      Publisher
      Optical Society of America
      Volume
      37
      Issue
      15
      Pages
      3042 - 3044
      Language
      English
      Type
      Article
      Item Usage Stats
      137
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      110
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      Abstract
      Thermal effects, which limit the average power, can be minimized by using low-doped, longer gain fibers, whereas the presence of nonlinear effects requires use of high-doped, shorter fibers to maximize the peak power. We propose the use of varying doping levels along the gain fiber to circumvent these opposing requirements. By analogy to dispersion management and nonlinearity management, we refer to this scheme as doping management. As a practical first implementation, we report on the development of a fiber laser-amplifier system, the last stage of which has a hybrid gain fiber composed of high-doped and low-doped Yb fibers. The amplifier generates 100 W at 100 MHz with pulse energy of 1 μJ. The seed source is a passively mode-locked fiber oscillator operating in the all-normaldispersion regime. The amplifier comprises three stages, which are all-fiber-integrated, delivering 13 ps pulses at full power. By optionally placing a grating compressor after the first stage amplifier, chirp of the seed pulses can be controlled, which allows an extra degree of freedom in the interplay between dispersion and self-phase modulation. This way, the laser delivers 4.5 ps pulses with ∼200 kW peak power directly from fiber, without using external pulse compression.
      Keywords
      As doping
      Average power
      Degree of freedom
      Dispersion management
      Doping levels
      Gain fibers
      Grating compressors
      High power fiber lasers
      Last stage
      Nonlinear effect
      Nonlinearity management
      Passively mode-locked
      Peak power
      Pulse energies
      Pulse generation
      Seed pulse
      Seed source
      Yb-fiber
      Fiber lasers
      Integrated optics
      Passive mode locking
      Pulse generators
      Ultrashort pulses
      Ytterbium
      Fibers
      Permalink
      http://hdl.handle.net/11693/21385
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OL.37.003042
      Collections
      • Department of Physics 2373
      • Institute of Materials Science and Nanotechnology (UNAM) 1891
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