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. Temporal multiplexing and shaping of few-cycle pulses with microoptical retroreflector arrays

    R. Grunwald, M. Bock, J. Jahns

    Advanced Optical Technologies 1 (2012) 97-99
  2. Adaptive shaping of complex pulsed nondiffracting light fields

    M. Bock, S. K. Das, R. Grunwald

    SPIE Proceedings Series 7950 (2011) 7950-7958
  3. Scattering-controlled femtosecond-laser induced nanostructuring of TiO2 thin films

    S. K. Das, A. Rosenfeld, M. Bock, A. Pfuch, W. Seeber, R. Grunwald

    SPIE Proceedings Series 7925 (2011) 79251B/1-9
  4. Highly efficient THG in TiO2 nanolayers for third-order pulse characterization

    S. K. Das, C. Schwanke, A. Pfuch, W. Seeber, M. Bock, G. Steinmeyer, T. Elsaesser, R. Grunwald

    Optics Express 19 (2011) 16985-16995
  5. Orbital angular momentum experiments with broadband few cycle pulses

    A. Richter, M. Bock, J. Jahns, R. Grunwald

    SPIE Proceedings 7613 (2010) 7613/1-9
  6. Programmable microoptics for ultrashort pulses

    R. Grunwald, M. Bock

    SPIE Newsroom March (2010) 1-3
  7. Multiphoton-absorption induced ultraviolet luminescence of ZnO nanorods using low-energy femtosecond pulses

    S. K. Das, M. Biswas, D. Byrne, M. Bock, E. McGlynn, M. Breusing, R. Grunwald

    Journal of Applied Physics 108 (2010) 043107/1-6
  8. Spatial control and diagnostics of femtosecond pulses with programmable microoptics

    R. Grunwald, M. Bock

    SPIE Proceedings 7579 (2010) 75790T/1-7
  9. Programmable microoptics for ultrashort pulses

    R. Grunwald, M. Bock

    SPIE Proceedings 7716 (2010) 77160P/1-8
  10. Programmable ultrashort-pulsed flying images

    M. Bock, S. K. Das, R. Grunwald

    Optics Express 17 (2009) 7465-7478