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Contact Details:

Office Location: EN216
Engineering Building
Hawthorn Campus
Lab Phone: +61-3-9214 5685
Fax: +61-3-9214 5160

Email: sven.teichmann@gmail.com

Faculty of Engineering and Industrial Sciences
Swinburne University of Technology
PO Box 218
Hawthorn, Victoria, 3122
Australia

Dr Sven Teichmann

Postdoctoral Research Fellow

Qualifications:

  • PhD, Science, ARC Centre of Excellence for Coherent X-Ray Science and Swinburne University of Technology, Melbourne in Australia (2009)
  • Dipl.-Phys. Univ., Max Planck Institute of Quantum Optics and Technical University Munich, Munich in Germany (2005)

Projects: ARC Centre of Excellence for Coherent X-Ray Science

  • High-Order Harmonic Generation for Coherent Diffractive Imaging
  • Short Wavelength Laser Source Program

    Research Interests

  • High Harmonic Generation: High-harmonic generation produced by the interaction of intense femtosecond laser pulses with a gaseous medium is a highly nonlinear optical process and allows the generation of coherent and laser-like radiation in the extreme-ultraviolet and soft x-ray region. Increasing the brightness and extending the spectral range of this radiation to lower wavelengths remains one the major challenges that the scientific community is faced with. By properly controlling the interaction of the laser beam with the gaseous medium we are able to phase-match the generated harmonic emission and confine it to only a few harmonic orders. Thus, this source is a potential source of extreme-ultraviolet and soft x-ray radiation and for time-resolved spectroscopy, such as femtosecond photoelectron spectroscopy and for polychromatic diffractive imaging with high spatial resolution, where only a few harmonic orders of short wavelength or a dominant photon energy are required and any optics in the harmonic beam path, such as reflection gratings, is undesirable. Effectively tailoring of the harmonic source for the experimental requirements is achieved by employing a novel and highly flexible approach of spectral extraction based on the application of the maximum entropy method to the Young double-slit's interference pattern of this source for efficient in-situ spectral characterization.
  • Coherent Diffractive Imaging:The high harmonic emission consisting of multiple harmonic orders is utilized for coherent diffractive imaging. Due to its nature, this source provides a high degree of spatial coherence, but the temporal coherence is poor. Thus, a new algorithm for phase-retrieval has been developed that can process the diffraction pattern which is a superposition of the diffraction patterns of each individual harmonic order of the high-harmonic beam. This algorithm is a modified version of the conventional algorithm (Gerchberg-Saxton-Fienup) for coherent diffractive imaging and includes the spectrum optimization iterative procedure (gradient descent method) within the main reconstruction iterative process. Also, an application of the maximum entropy method is employed for improvement of the quality of the reconstructed image. The formalism can readily be adapted to any short-wavelength polychromatic source in which there is a high degree of spatial coherence at each sampled wavelength but poor temporal coherence across the sampled spectrum. Diffraction patterns of wide dynamic range can be acquired by means of a new design involving a beam stop and image stitching.

    Selected Publications:

    • Extreme ultraviolet radiation for coherent diffractive imaging with high spatial resolution, Science China Physics, Mechanics & Astronomy 53, 6 (2010)

    • High-harmonic generation for coherent diffractive imaging, ARC Centre of Excellence for Coherent X-Ray Science and Centre for Atom-Optics and Ultrafast Spectroscopy at Swinburne University of Technology, PhD Dissertation (2009)

    • Efficient and highly coherent extreme ultraviolet high-harmonic source. Springer Berlin, Heidelberg, Springer Series in Chemical Physics, Ultrafast Phenomena XVI 92, (2009)

    • Diffractive imaging using a polychromatic high-harmonic generation soft-x-ray source. Journal of Applied Physics 106, 023110 (2009)-(selected for and featured in American Institute of Physics Journal of Applied Physics, 10 September Research Highlights (2009))

    • Spectral characteristics across the spatial profile of a high-harmonic beam, Journal of Physics D: Applied Physics 42, 135108 (2009)

    • Phase-matched emission of few high-harmonic orders from a helium gas cell, Applied Physics Letters 94, 171111 (2009) selected for and featured in American Physical Society and American Institute of Physics Virtual Journal of Ultrafast Science (Ultrafast Methods and Measurement Techniques), 8(6) June (2009)

    • Multiple wavelength diffractive imaging, Physical Review A, 79, 023809 (2009)selected for and featured in Physical Review A, Kaleidoscope Images: February (2009)

    • High-harmonic-generation spectrum reconstruction from Young’s double-slits interference pattern using the maximum entropy method, Optics Letters 33 2341 (2008)

    • Generation of high flux, highly coherent extreme ultraviolet radiation in a gas cell, Journal of Applied Physics 104, 023105 (2008)

    • Phase-matching for generation of few high order harmonics in a semi-infinite gas cell, Physics Letters A 372 5254 (2008)

    • Collisional decay of 87Rb Feshbach molecules at 1005.8 G, Physical Review A 74 , 062706 (2006)

    • Preparation, storage and decay of ultracold 87Rb molecules in an optical dipole trap, Masters Thesis, Max-Planck Institute for Quantum Optics and Technical University of Munich (2005)

     

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