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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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Two-crystal laser with cavity dumping

For many years our group is conducting research at the leading edge of cavity-dumped laser systems. For further power scaling of these systems we built up a two-crystal laser with cavity dumping working in the chirped pulse regime. By splitting the applied pump power to two gain media, we avoid the limitations of thermal lensing and opto-thermal damage of the crystals. In addition, the enhancement of the small-signal gain results in very high dumping efficiencies up to 67%. Thereby we achieve 7 µJ of pulse energy at a repetition rate of 1 MHz corresponding to 12 MW compressed peak power, which is sufficient for direct white light generation in YAG. Even higher output powers are obtained by using this laser system as a seed for a rod-type fiber amplifier.

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Thin Disk Laser

Our group has outstanding theoretical and experimental experiences with thin disk lasers. More than 3 µJ have been reported from a passively mode-locked oscillator based on a Yb:KYW oscillator with cavity dumping at 1 MHz repetition rate and pulse durations below 700 fs. At even higher repetition rates of 34 MHz output powers up to 25 W with 440 fs duration are generated with a passively mode-locked Yb:KLuW thin disk oscillator. The frequency doubled output of the latter system is used as pump source for an optical parametric oscillator.

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Thin Disk Regenerative Amplifier

A thin disk regenerative amplifier is built up for OPCPA pumping. The amplifier is seeded with the infrared edge of a broadband Ti:sapphire (link) oscillator without using any stretcher and compressor arrangements. Thus, the amplified output is optically synchronized with the Ti:sapphire output. This in combination with the obtained output energies of more than 100 µJ, pulse durations of about 1.5 ps and high repetition rates between 100 and 500 kHz makes the system an ideal pump source for parametric amplifiers.

Literature:

  • Marcel Schultze, Thomas Binhammer, Andy Steinmann, Guido Palmer, Moritz Emons, and Uwe Morgner, "Few-cycle OPCPA system at 143 kHz with more than 1 μJ of pulse energy," Opt. Express 18, 2836-2841 (2010) www.opticsinfobase.org/oe/abstract.cfm;
  • Marcel Schultze, Thomas Binhammer, Guido Palmer, Moritz Emons, Tino Lang, and Uwe Morgner, "Multi-μJ, CEP-stabilized, two-cycle pulses from an OPCPA system with up to 500 kHz repetition rate," Opt. Express 18, 27291-27297 (2010) www.opticsinfobase.org/abstract.cfm;

Few-cycle Ti:sapphire Oscillators

The development, characterization and application of few-cycle laser pulses generated by Ti:sapphire laser oscillators has been a mainstay of the group of Uwe Morgner for years. 

 The leading-edge lasers engineered by our group hold the distinction of generating the shortest pulse durations ever generated directly from an femtosecond oscillator as short as 4.3 fs, as well as the most energetic laser pulses recently achieved from Ti:sapphire lasers. By using broadband pulse shaping techniques and a stabilization of the electric field oscillation of those ultra-short laser pulses, arbitrary waveforms can be generated on a single-cycle scale that allows us to investigate numerous areas in fundamental physics with exceptional precision.


Literature:

  • S. Rausch, “Controlling the Electric-Field of Few-Cycle Laser Pulses on the Cycle-Scale”, Dissertation Universität Hannover (2010), [file]
  • T. Binhammer, S. Rausch, M. Jackstadt, G. Palmer, and U. Morgner, “Phase-stable Ti:Sapphire Oscillator Quasi-Synchronously Pumped by a Thin-Disk Laser “, Applied Physics B 100, (2010), http://www.springerlink.com/content/5j06244171574478/ 
  •  S. Rausch, T. Binhammer, A. Harth, E. Schulz, M. Siegel, and U. Morgner, “Few-cycle oscillator pulse train with constant carrier-envelope-phase and 65 as jitter”, Optics Express 17, 20282–20292 (2009), http://www.opticsinfobase.org/abstract.cfm?URI=oe-17-22-20282 
  • M. Siegel, N. Pfullmann, G. Palmer, S. Rausch, T. Binhammer, M. Kovacev, and U. Morgner, “Microjoule pulse energy from a chirped-pulse Ti:Sapphire oscillator with cavity dumping”, Optics Letters 34, 740–741 (2009), http://www.opticsinfobase.org/abstract.cfm?uri=ol-34-6-740 

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