MBI Staff Member – Personal info

Position

Project Member: 1.2 "Ultrafast Laser Physics and Nonlinear Optics"

Research

Mid-infrared laser becoming increasingly important for high-harmonic generation (attosecond pulse), development of novel x-ray sources, and strong-field physics. Optical parametric chirped-pulse amplification (OPCPA) seems to be the most promosing approach to generate high power midinfrared pulses, i.e. few-cyle pulses with pulse energies in the mJ range at kHz repetition rates. However, powerful pump lasers are required.

To exploite the relatively high nonlinear coefficient of non-oxide crystals, such as ZnGeP2, the emitted wavelength of the pump sources have to be above 2 µm. This ensures that the absorption in the nonlinear crystals is significantly reduced. Here we concentrate our research on regenerative amplifiers using Ho:YLF as a gain medium with a central wavelenght of around 2050 nm. Pulse energies in the millijoule regime (~10 mJ) have been achieved directly from our regenerative amplifier which was conceptually designed as a ring cavity. With the entire setup shown in Fig. 1 we are able to generate pulse energies of up to 55 mJ at 1 kHz with very low pulse-to-pulse fluctuations (rms < 0.5 %).

Fig. 1. High power 2 µm laser delivering pulse energies of up to 55 mJ. The seed-source is a three-stage system consiting of a fs Er:fiber laser, a super-continuum highly nonlinear fiber and a Tm:fiber pre amplifier. After 24 round trips a state of operation is reached where the regenerative amplifier emits stable pulses (rms < 0.3 %) of around 10 mJ at 1 kHz. A booster (two Ho:YLF crystals) stage raises the pulse energy to > 50 mJ.

Curriculum vitae

2013-present Postdoc at the Max Born Institute: High-power mid-infrared lasers

2013 Dissertation “Programmable ultrashort pulsed highly localized wave packets” at the Max Born Institute

2008-2013 Ph. D. student at the Max Born Institute

2008 Master thesis “Spatio-spectral shaping of few-cycle laser pulses with liquid crystal displays” at the Max Born Institute

2006-2008 Study of -Photonics- at the University of Applied Science Wildau (Graduation: Master of Engineering)

2005 Diploma thesis “Spatio-spectrally resolved characterization of ultrashort laser pulses” at the Max Born Institute (MBI) for Nonlinear Optics and Short Pulse Spectroscopy

2001-2005 Study of -Physical Engineering- of the department Engineering / Industrial Engineering with Business Studies at the University of Applied Science Wildau (Graduation: Diploma-Engineer)

MBI Publications

  1. Efficient second harmonic generation in ZnO nanorod arrays with broadband ultrashort pulses

    S. K. Das, M. Bock, C. O'Neill, R. Grunwald, K. M. Lee, H. W. Lee, S. Lee, F. Rotermund

    Applied Physics Letters 93 (2008) 181112/1-3
  2. Smart spatio-temporal beam shaping with thin-film microoptics

    R. Grunwald, M. Bock, Huferath-von Luepke, S.

    SPIE Proceedings 7062 (2008) 706202 (10 pages)
  3. Ultrashort-pulsed truncated polychromatic Bessel-Gauss beams

    R. Grunwald, M. Bock, V. Kebbel, S. Huferath, U. Neumann, G. Steinmeyer, G. Stibenz, J.-L. Néron, M. Piché

    Optics Express 16 (2008) 1077-1089
  4. A chirped photonic-crystal fibre

    J. S. Skibina, R. Iliew, J. Bethge, M. Bock, D. Fischer, V. I. Beloglasov, R. Wedell, G. Steinmeyer

    Nature Photonics 2 (2008) 679-683
  5. Noncollinear autocorrelation with radially symmetric nondiffracting beams

    Huferath-von Luepke, S., V. Kebbel, M. Bock, S. K. Das, R. Grunwald

    SPIE Proceedings 7063 (2008) 706311 (12 pages)
  6. Self-reconstruction of pulsed optical X-waves

    R. Grunwald, U. Neumann, U. Griebner, G. Steinmeyer, G. Stibenz, M. Bock

    Localized Waves; Wiley Series in Microwave and Optical Engineering Wiley-Interscience (2008) 299-314
  7. Angular tolerance of Shack-Hartmann wavefront sensors with microaxicons

    R. Grunwald, S. Huferath, M. Bock, U. Neumann, S. Langer

    Optics Letters 32 (2007) 1533-1535
  8. Robust Shack-Hartmann wavefront sensing with ultraflat microaxicons

    R. Grunwald, M. Bock, S. Huferath

    Proceedings SPIE 6617 (2007) 661700/1-12
  9. Räumlich-spektral aufgelöste Charakterisierung von ultrakurzen Laserimpulsen

    M. Bock

    Diplomarbeit Technische Fachhochschule (2005)