Project Coordinator 4.1: Implementation of Lasers and Measuring Techniques
Development of advanced ultrashort pulse lasers, amplifiers, and parametric devices operating in the near- and mid-IR wavelength ranges including components and complete systems for direct implementation within other projects at MBI.
An example is the development of novel CPA laser sources emitting around 2 µm wavelength. This laser system operating at kilohertz repetition rate will serve as driver for OPCPA in the mid-IR. Figure (a) shows the simulated bifurcation diagram of a Ho:YLF regenerative amplifier (RA) at a 1 kHz repetition rate and 24 round trips indicating the most interesting operation regimes, i.e., stable double-pulsing (yellow coded bar) and the single-energy regime (green coded bar) beyond the final bifurcation point (BP final). Based on our model the RA is designed for operation in the single-energy regime beyond BPfinal. The measured complete RA bifurcation diagram of the re-designed RA at 1 kHz and 24 round trips is presented in Fig. (b). It agrees well with our numerical simulations [Fig. (a)]. Only the predicted multi-pulsing between 20 and 30 W pump power is less pronounced in the experiment. The highest pulse energy of 12 mJ can be extracted in the stable double-pulsing regime in the upper bifurcation branch (yellow coded bar), however at 0.5 kHz, the half of the repetition rate. BPfinal appears at a pump power of 47 W and denotes the transition to the single-energy regime where any multi-stabilities and chaotic behavior have been overcome. The extracted RA pulse energy of 9.7 mJ is the by far highest reported for 2-µm RAs operating in the single-energy regime. Taking into account the applied pump power of 50 W, the extraction efficiency is as high as 19.5%. Performing the transition from the stable double-pulsing to the single-energy regime, the RA’s pulse-to-pulse stability is further improved with a rms value <0.5%. Figure (c) shows the corresponding pulse stability measurement in the vicinity of BPfinal and beyond in the single-energy regime (green coded bar).
since 1992 Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany, staff scientist and project coordinator.
1993 - 1996 Ph.D. thesis at the Optical Institute, Technical University Berlin, Germany, with Prof. Horst Weber,
Title of thesis: Fiber bundle lasers with high average power,
1989 - 1992 Institute of Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany, staff scientist,
1986 - 1989 Institute of Mechanics, Chemnitz, Germany, staff scientist,
1981 - 1986 Diploma degree in Physics; Physics Department, University of Jena, Germany,
Title of thesis: Characterization of lattice distorsions in LiF crystals,
- Growth, optical characterization and laser operation of a new stoichiometric crystal KYb(WO4)2 Physical Review B 65 (2002) 165121/1-11
- Femtosecond laser beam shaping with structured thin-film elements SPIE Proceedings 4833 (2002) 354-361
- Laser operation of a new stoichiometric crystal KYb(WO4)2 Applied Physics B 74 (2002) 185-189
- Passively mode-locked Yb:KYW laser pumped by a tapered diode laser Optics Express 10 (2002) 108-113
- Femtosecond interference experiments with thin-film micro-optical components FRINGE 2001 - The 4th International Workshop on Automatic Processing of Fringe Patterns Elsevier (2001) 33-40
- Spatially resolved small-angle non-collinear interferometric autocorrelation of ultrashort pulses with micro-axicon arrays Journal of the Optical Society of America A 18 (2001) 2923-2931
- Design, characterization and applications of multilayer micro-optics SPIE Proceedings 4437 (2001) 40-49
- High energy ultrafast fiber CPA System OSA Trends in Optics and Photonics Series (TOPS), Chr. Marshall (Ed.) 50 (2001) 111-113
- Fiber based high repetition rate, high energy laser source applying chirped pulse amplification Optics Communications 190 (2001) 309-15
- High average power ultrafast fiber CPA system Applied Physics B 71 (2000) 889-891