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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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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:

  •  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) http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-11-6889
  • 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) http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-18-15525
  • 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

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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