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,
- Epitaxially grown Yb:KLu(WO4)2 composites for continuous-wave and mode-locked lasers in the 1 mm spectral range Journal of Non-Crystalline Solids 352 (2006) 2367-2370
- Yb-doped KY(WO4)2 planar waveguide laser Optics Letters 31 (2006) 53-55
- Exciton resonance tuning for the generation of subpicosecond pulses from a mode-locked semiconductor disk laser Applied Physics Letters 89 (2006) 141107/1-3
- Optically pumped semiconductor disk laser with graded and step indices Applied Physics Letters 89 (2006) 151120/1-3
- Mode-locked laser operation of epitaxially grown Yb:KLu(WO4)2 composites Optics Letters 30 (2005) 2484-2486
- Continuous wave and tunable laser operation of Yb3+ in disordered NaLa(MoO4)2 Applied Physics B - Lasers and Optics 81 (2005) 621-625
- Efficient continuous-wave and Q-switched operation of a diode-pumped Yb:KLu(WO4)2 laser with self-Raman conversion Optics Letters 30 (2005) 2427-2429
- Efficient room temperature continuous-wave operation of an Yb3+: Sc2O3 crystal laser at 1041.6 and 1094.6 nm physica status solidi a 202 (2005) R19-R21
- Growth and continuous-wave laser operation of disordered crystals of Yb:NaLa(WO4)2 and Yb:NaLa(MoO4)2 physica status solidi a 202 (2005) R29-R31
- Continuous-wave laser operation of Yb:LuVO4 Optics Letters 30 (2005) 3162-3164