MBI Staff Member – Personal info


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


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. Ho:YLF regenerative amplifier delivering 22 mJ, 2.0 ps pulses at a 1 kHz repetition rate

    M. Bock, L. von Grafenstein, D. Ueberschaer, M. Mero, T. Nagy, U. Griebner

    Optics Express 32 (2024) 23499-23509
  2. Generation of propagation-dependent OAM self-torque with chirped spiral gratings

    R. Grunwald, M. Jurke, M. Liebmann, A. Treffer, M. Bock

    Photonics 11 (2024) 11050463/1-15
  3. Characterization of orbital angular momentum beams by polar mapping and Fourier Transform

    R. Grunwald, M. Bock

    Photonics 11 (2024) 1-15
  4. Nonlinear compression of few-cycle multi-mJ 5 µm pulses in ZnSe around zero-dispersion

    M. Bock, L. von Grafenstein, D. Ueberschaer, G. Steinmeyer, U. Griebner

    Optics Letters 49 (2024) 351-354
  5. Pulse shaping in a midwave-IR OPCPA for multi-μJ few-cycle pulse generation at 12 μm via DFG

    M. Bock, L. von Grafenstein, P. Fuertjes, D. Ueberschaer, M. Duda, O. Novák, N. Abrosimov, U. Griebner

    Optics Express 31 (2023) 14096-14108
  6. Structuring light by combining spatial modulation and fast angular shaping

    R. Grunwald, M. Jurke, M. Liebmann, M. Bock, B. P. Bruno, H. Gowda, U. Wallrabe

    SPIE Proceedings Series 1243606 (2023) 1243606/1-6
  7. Orbital angular momentum encoded beam tracking and wavefront sensing

    R. Grunwald, M. Jurke, M. Liebmann, M. Bock

    Journal of Lightwave Technology 41 (2023) 2017-2024
  8. Ultrafast element- and depth-resolved magnetization dynamics probed by transverse magneto-optical Kerr effect spectroscopy in the soft x-ray range

    M. Hennecke, D. Schick, T. Sidiropoulos, F. Willems, A. Heilmann, M. van Moerbeck-Bock, L. Ehrentraut, D. Engel, P. Hessing, B. Pfau, M. Schmidbauer, A. Furchner, M. Schnuerer, C. von Korff Schmising, S. Eisebitt

    Physical Review Research 4 (2022) L022062/1-7
  9. High-flexibility control of structured light with combined adaptive optical systems

    R. Grunwald, M. Jurke, M. Bock, M. Liebmann, B. Poyyathuruthy Bruno, H. Gowda, U. Wallrabe

    Photonics 9 (2022) 9010042/1-13
  10. Cr:ZnS-based soliton self-frequency shifted signal generation for a tunable sub-100 fs MWIR OPCPA

    P. Fuertjes, L. von Grafenstein, C. Mei, M. Bock, U. Griebner, T. Elsaesser

    Optics Express 30 (2022) 5142-5150