MBI-Mitarbeiter - Persönliche Daten

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 Publikationen

  1. Bifurcation analysis in high repetition rate regenerative amplifiers

    von Grafenstein, L., M. Bock, U. Griebner

    IEEE Journal of Selected Topics in Quantum Electronics 24 (2018) 3000213
  2. Generation of millijoule few-cycle pulses at 5  μm by indirect spectral shaping of the idler in an optical parametric chirped pulse amplifier

    M. Bock, von Grafenstein, L., U. Griebner, T. Elsaesser

    Journal of the Optical Society of America B-Optical Physics 35 (2018) C18-C24
  3. Array-specific propagation effects of flexibly structured ultrashort pulses

    A. Treffer, M. Bock, U. Wallrabe, R. Grunwald

    SPIE Proceedings Series 10120 (2017) 01200S/1-8
  4. Spectral anomalies and Gouy rotation around the singularity of ultrashort vortex pulses

    M. Liebmann, A. Treffer, M. Bock, T. Elsaesser, R. Grunwald

    Optics Express 25 (2017) 26076-26088
  5. 5 µm few-cycle pulses with multi-gigawatt peak power at a 1 kHz repetition rate

    L. von Grafenstein, M. Bock, D. Ueberschaer, K. Zawilski, P. Schunemann, U. Griebner, T. Elsaesser

    Optics Letters 42 (2017) 3796-3799
  6. Nondiffracting self-imaging of ultrashort wavepackets

    M. Bock, A. Treffer, R. Grunwald

    Optics Letters 42 (2017) 2374-2377
  7. Adaptive non-collinear autocorrelation of few-cycle pulses with an angular tunable bi-mirror

    A. Treffer, J. Brunne, M. Bock, S. Koenig, U. Wallrabe, R. Grunwald

    Applied Physics Letters 108 (2016) 051103/1-5
  8. Ho:YLF chirped pulse amplification at kilohertz repetition rates – 4.3  ps pulses at 2  μm with GW peak power

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

    Optics Letters 41 (2016) 4668-4671
  9. Taming chaos: 16 mJ picosecond Ho:YLF regenerative amplifier with 0.7 kHz repetition rate

    L. von Grafenstein, M. Bock, G. Steinmeyer, U. Griebner, T. Elsaesser

    Laser & Photonics Reviews 10 (2016) 123–130
  10. Mapping the spectral twist of few cycle vortex pulses

    M. Bock, J. Jahn, M. Musigmann, R. Grunwald

    SPIE Proceedings Series 9764 (2016) 97640O/1-7