Rivera C.A.,University of Southern California |
Bradforth S.E.,University of Southern California |
Tempea G.,Femtolasers Produktions GmbH
Optics Express | Year: 2010
Typical femtosecond pulse compression of deep ultraviolet radiation consists of prism or diffraction grating pair chirp compensation but, both techniques introduce higher-order dispersion, spatial-spectral beam distortion and poor transmission. While negatively chirped dielectric mirrors have been used to compress near infrared and visible pulses to <10 fs, there has been no extension of this technique below 300 nm. We demonstrate the use of Gires-Tournois interferometer (GTI) negative dispersion multilayer dielectric mirrors designed for pulse compression in the deep ultraviolet region. GTI mirror designs are more robust than chirped mirrors and, can provide sufficient bandwidth for the compression of sub- 30-fs pulses in the UV wavelength range. Compression of a 5 nm (FWHM) pulse centered between 266 and 271 nm to 30 fs has been achieved with less pulse broadening due to high-order dispersion and no noticeable spatial deformation, thereby improving the resolution of ultrafast techniques used to study problems such as fast photochemical reaction dynamics. © 2010 Optical Society of America. Source
Femtolasers Produktions GmbH | Date: 2013-01-15
Method and device for optical inspection of a sample using spectral interferometry, wherein a beam (2) emitted by a radiation source (1) is directed onto the sample (5) and a reference beam (2) is directed onto a reference sample (4), and the spectral interference of both beams after being reflected on the samples or after passing the samples is recorded by means of a spectrograph (6); the interferogram I() thus obtained is numerically derived with respect to the angular frequency . For the function I() thus obtained the zeros
Femtolasers Produktions GmbH | Date: 2012-11-15
A multifunctional laser device configured to be applicable as such in each of: multiple photon processes, nano structuring processes, optical coherence tomography, Terahertz (THZ) spectroscopy, THz imaging; or a combination of such processes; and comprising a mode-locked linear (X or Z-folded) fs laser resonator having a repetition rate of at least 300 MHz and 600 MHz at most and, thus, a corresponding short resonator length, said fs laser resonator further being a dispersive mirrors cavity having an average negative GDD (Group Delay Dispersion) in the spectral range of the laser operation, and being arranged to generate laser pulses with a pulse width of less than 30 fs, and comprising a pump laser operating at an optical output pump power of less than 2 W.
Agency: Cordis | Branch: FP7 | Program: MC-ITN | Phase: FP7-PEOPLE-ITN-2008 | Award Amount: 3.60M | Year: 2009
Worldwide there is great excitement about two new ultrafast XUV/x-ray sources that are presently coming available. Attosecond XUV pulses by high-harmonic generation (HHG) will now allow for the first time to make movies of ultrafast electron motion, and thereby to investigate photo-chemical processes beyond the Born-Oppenheimer limit. At the same time, XUV/x-ray Free Electron Lasers (FELs) based on self-amplification of spontaneous emission (SASE) of relativistic electrons moving through an undulator structure will allow for the first time to track structural changes in (bio-)molecules using femtosecond time-resolved x-ray diffraction. In this context, the objectives of ATTOFEL are six-fold: 1) by establishing a framework for collaborative research on attosecond science, the potential is created for major breakthroughs in our understanding of the role of ultrafast electron dynamics in atomic physics, molecular physics and materials science. 2) by bringing together groups who recently have combined research in attosecond science with research efforts at the FLASH-FEL in Hamburg, an effective channel is created for knowledge transfer between the HHG/attosecond laser community and the FEL-community, which have historically been separate. 3) a generation of young scientists is trained that can shape the future of attosecond and FEL science, or that can embark on successful careers in industry. 4) the competitive advantage that European attosecond science and European XUV/x-ray FEL facilities currently have is significantly aided. 5) the competitive position of European industrial partners in the very demanding high-end ultrafast lasers market is strengthened. 6) the structuring of the international research community in this field will be consolidated, strengthened and expanded.
Agency: Cordis | Branch: FP7 | Program: MC-ITN | Phase: PEOPLE-2007-1-1-ITN | Award Amount: 5.04M | Year: 2008
The objective of this project is to set up an Initial Training Network on advanced techniques for ultrafast manipulation of atoms and molecules by strong femtosecond laser pulses. The project comprises a diverse range of applications of strong-field coherent control to ultrafast spectroscopy and microscopy; nuclear and electron wavepacket dynamics; alignment of molecules with applications to collisions, high harmonic generation and adsorption; characterization and control of dissipation; stabilization of cold atoms and molecules; quantum state and process tomography; and ultrafast information processing. The use of strong shaped femtosecond laser pulses opens a novel avenue to control of quantum dynamics via hitherto inaccessible physical mechanisms. The new control scenarios require the development of novel versatile femtosecond sources in the UV and VUV range of high shaping capabilities, to which a part of the research will be dedicated, with anticipated spin-offs of great multidisciplinary interest, e.g. in chemistry and biology. The combined expertise of the network - a joint effort of 10 universities and 3 industrial companies - represents the cutting edge of research and training in femtosecond light-matter interactions in Europe. The network will train 18 doctoral students and about 11 young postdoctoral researchers. The training activities will combine several dedicated instruments of network-wide training, capitalizing on their synergy with a backbone of specialized training inside the groups. The training program will be adapted to the ESRs, with elementary, advanced and expert phases initiated at the network schools and workshops. Prominent scientists from Europe and overseas, and industry leaders from the companies in the network and from outside, will contribute to the schools and workshops. Special attention will be focused on developing important complementary skills, such as communication, presentation, project planning and management.