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Logo: Institut für Quantenoptik/Leibniz Universität Hannover
Logo Leibniz Universität Hannover
Logo: Institut für Quantenoptik/Leibniz Universität Hannover
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Fiber Oscillators and Amplifiers

Ultrafast fiber oscillators

 Based on wave guiding effects ultrafast fiber lasers offer a high potential for very stable and compact laser sources.  Due to the design of the oscillator different pulse regimes can be realized allowing a scalability of the average output power by simultaneously reducing the pulse duration. By an optimization of the laser parameters we realized a fiber laser with a compressed pulse duration of 55  fs and 1 W output power. This system is developed as a pump laser for further systems as a non-collinear optical parametric oscillator.

Literature:

  • G. Pelegrina-Bonilla, K. Hausmann, H. Sayinc, U. Morgner, J. Neumann, D. Kracht, Analysis of the modal evolution in fused-type mode-selective fiber couplers, Optics Express 23 22977-90 (2015)
  • G. Pelegrina-Bonilla, K. Hausmann, H. Tünnermann, P. Weßels, H. Sayinc, U. Morgner, J. Neumann, D. Kracht, Analysis of the Coupling Mechanism in Asymmetric Fused Fiber Couplers, IEEE Journal of Lightwave Technology 32, 2382-91 (2014)
  • G. Pelegrina-Bonilla, K. Hausmann, K. Liu, H. Sayinc, U. Morgner, J. Neumann, D. Kracht, Matching of the propagation constants in an asymmetric single-mode fused fiber coupler for core pumping thulium-doped fiber at 795 nm, Optics Letters 37, 1844-6 (2012)
  • A. Wienke, F. Haxsen, D. Wandt, U. Morgner, J. Neumann, and D. Kracht, Ultrafast, stretched-pulse thulium-doped fiber laser with a fiber-based dispersion management, Optics Letters 37, 2466-8 (2012)
  • F. Haxsen, D. Wandt, U. Morgner, J. Neumann, D. Kracht, Monotonically chirped pulse evolution in an ultrashort pulse thulium-doped fiber laser  Optics Letters 37, 1014-6 (2012)
  • N.B. Chichkov, C. Hapke, J. Neumann, D. Kracht, D. Wandt, U. Morgner, Pulse duration and energy scaling of femtosecond all-normal dispersion fiber oscillators, Optics Express 20, 3844-52 (2012)
  • D. Mortag, T. Theeg, K. Hausmann, L. Grüner-Nielsen, K. G. Jespersen, U. Morgner, D. Wandt, D. Kracht, J. Neumann, Sub-200 fs microjoule pulses from a monolithic linear fiber CPA system, Optics Communications 285, 706-9 (2012)
  • H. Sayinc, K. Hausmann, U. Morgner, J. Neumann, and D. Kracht, Picosecond all-fiber cascaded Raman shifter pumped by an amplified gain switched laser diode, Optics Express 19, 25918-24 (2011)
  • D. Mortag, T. Theeg, K. Hausmann, L. Grüner-Nielsen, K. G. Jespersen, U. Morgner, D. Wandt, D. Kracht, J. Neumann, 189 fs microjoule pulses from a monolithic single-stage Yb fiber CPA system, Optics Express 19, 546-51 (2011)
  • N.B. Chichkov, C. Hapke, K. Hausmann, T. Theeg, D. Wandt, U. Morgner, J. Neumann, D. Kracht, 0.5 µJ femtosecond pulses from a giant-chirp ytterbium fiber oscillator, Optics Express 19, 3647-50 (2011)
  • D. Mortag, D. Wandt, U. Morgner, D. Kracht, J. Neumann, Sub-80-fs pulses from an all-fiber-integrated dissipative-soliton laser at 1 μm, Optics Express 19, 546-51 (2011).
  • J. Matyschok, O. Prochnow, T. Binhammer, S. Rausch, K. Hausmann, H. Sayinc, D. Kracht und U. Morgner, "Modengekoppelter Faserlaser mit über 1 Watt mittlerer Leistung und fourierlimitierten Pulsdauern von unter 60 fs," in: DPG Tagung 2011, S. Q 67.3
  • F. Haxsen, D. Wandt, U. Morgner, J. Neumann, D. Kracht, Pulse energy of 151 nJ from ultrafast thulium-doped chirped-pulse fiber amplifier, Optics Letters 35, 2991-3 (2010)
  • N. Chichkov, K. Hausmann, D. Wandt, U. Morgner, J. Neumann, D. Kracht, 50 fs pulses from an all-normal dispersion erbium fiber oscillator, Optics Letters 35, 3081-3 (2010)
  • F. Haxsen, D. Wandt, U. Morgner, J. Neumann, D. Kracht, Pulse characteristics of a passively mode-locked thulium fiber laser with positive and negative cavity dispersion, Optics Express 18, 18981-8 (2010)
  • N.B. Chichkov, K. Hausmann, D. Wandt, U. Morgner, J. Neumann, D. Kracht High-power dissipative solitons from an all-normal dispersion erbium fiber oscillator, Optics Letters 35, 2807-9  (2010)
  • O. Prochnow, A. Ruehl, M. Schultz, D. Wandt, and D. Kracht, "All-fiber similariton laser at 1 μm without dispersion compensation," Opt. Express 15, 6889-6893 (2007)
  • O. Prochnow, R. Paschotta, E. Benkler, U. Morgner, J. Neumann, D. Wandt, and D. Kracht, "Quantum-limited noise performance of a femtosecond all-fiber ytterbium laser," Opt. Express 17, 15525-15533 (2009)

Rod Type Fiber Amplifiers

As an alternative to the regenerative amplifier concept, the amplification by means of rod type fiber amplifiers is as well investigated in our group. For example using the two crystal oscillator as seed source (1 MHz, ~5 W, ~400 fs) amplified average powers of more than 100 W have been generated so far using an 80 cm long polarization maintaining fiber. The compression of those pulses leads to pulse energies of more than 80 µJ at 1 MHz repetition rate and pulse duration of about 700 fs. With this enormous peak power, the system is used in a PLD experiment to generate random lasing structures.

Hollow Fiber Propagation

Thank to the recently developed stretched flexible hollow fibers the interaction length of spectral broadening stages in pulse compressors has become freely scalable. This opens the possibility to reach higher compression ratios or to efficiently compress multi-mJ pulses. Our goal here is to extend the operation range of current ultrafast light sources by exploiting the full potential of the new waveguides.

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