A5053777568- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Laser-Plasma Interactions and Diagnostics
- Solid State Laser Technologies
- Advanced X-ray Imaging Techniques
- Spectroscopy and Laser Applications
- Optical Network Technologies
- Mass Spectrometry Techniques and Applications
- Laser-induced spectroscopy and plasma
- Laser Design and Applications
- Advanced Fiber Optic Sensors
- Combustion and flame dynamics
- Advanced Fluorescence Microscopy Techniques
- Photocathodes and Microchannel Plates
- Advanced Combustion Engine Technologies
- Advanced Electron Microscopy Techniques and Applications
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Laser Material Processing Techniques
- Ocular and Laser Science Research
- Particle Accelerators and Free-Electron Lasers
- Advancements in Photolithography Techniques
- Catalytic Processes in Materials Science
- Plasma Applications and Diagnostics
Active Fiber Systems (Germany)
2017-2022
Friedrich Schiller University Jena
2009-2020
Helmholtz Institute Jena
2010-2018
Albert Einstein College of Medicine
2010-2015
Leibniz Institute of Photonic Technology
2012-2015
Center for Biomolecular Nanotechnologies
2010
Fraunhofer Institute for Applied Optics and Precision Engineering
2010
Schiller International University
2007-2010
Joint Institute for Laboratory Astrophysics
2007
Laser- und Medizin-Technologie (Germany)
2006
We present the first experimental demonstration of lensless diffractive imaging using coherent soft x rays generated by a tabletop soft-x-ray source. A 29 nm high harmonic beam illuminates an object, and subsequent diffraction is collected on x-ray CCD camera. High dynamic range patterns are obtained taking multiple exposures while blocking small-angle blocks varying size. These reconstruct to images with 214 resolution. This work demonstrates practical microscope that promises find...
We report on the experimental demonstration of a fiber chirped- pulse amplification system capable generating nearly transform-limited sub 500 fs pulses with 2.2 mJ energy at 11 W average power. The resulting record peak power 3.8 GW could be achieved by combining active phase shaping an efficient reduction acquired nonlinear phase. Therefore, we used Ytterbium-doped large-pitch mode field diameter 105 µm as main amplifier.
We report on a femtosecond fiber laser system comprising four coherently combined large-pitch fibers as the main amplifier. With this system, pulse energy of 1.3 mJ and peak power 1.8 GW are achieved at 400 kHz repetition rate. The corresponding average output is high 530 W. Additionally, an excellent beam quality efficiency combination have been obtained. To best our knowledge, such parameter combination, i.e., gigawatt pulses with half kilowatt power, has not demonstrated so far any other...
We report on an OPCPA system delivering CEP-stable pulses with a pulse duration of only 1.7 optical cycles at 880 nm wavelength. This is achieved by the generation, parametric amplification and compression full octave bandwidth. The pumped high average power Yb-fiber laser system, which allows for operation up to 1 MHz repetition rate 22 W output power. Further scaling towards single-cycle pulses, higher energy discussed.
Few-cycle lasers are essential for many research areas such as attosecond physics that promise to address fundamental questions in science and technology. Therefore, further advancements connected significant progress the underlying laser Here, two-stage nonlinear compression of a 660 W femtosecond fiber system is utilized achieve unprecedented average power levels energetic ultrashort or even few-cycle pulses. In first step, 408 W, 320 μJ, 30 fs pulses achieved, which can be compressed 216...
Sources of short wavelength radiation with femtosecond to attosecond pulse durations, such as synchrotrons or free electron lasers, have already made possible numerous, and will facilitate more, seminal studies aimed at understanding atomic molecular processes on fundamental length time scales. Table-top sources coherent extreme ultraviolet soft x-ray enabled by high harmonic generation (HHG) ultrashort lasers also gained significant attention in the last few years due their enormous...
The generation of three-cycle multi-millijoule pulses at 318 W power is reported by compressing a Yb-fiber chirped pulse amplifier in 6 m long stretched flexible hollow fiber. This technique brings high-power lasers to the few-cycle regime.
The process of high harmonic generation (HHG) enables the development table-top sources coherent extreme ultraviolet (XUV) light. Although these are now matured sources, they still mostly rely on bulk laser technology that limits attainable repetition rate to low kilohertz regime. Moreover, many emerging applications such light (e.g., photoelectron spectroscopy and microscopy, diffractive imaging, or frequency metrology in XUV spectral region) require an increase rate. Ideally, operated with...
We report on a few-cycle laser system delivering sub-8-fs pulses with 353 μJ pulse energy and 25 GW of peak power at up to 150 kHz repetition rate. The corresponding average output is as high 53 W, which represents the highest obtained from any architecture so far. combination both provides unique opportunities for applications. demonstrate harmonic generation water window record-high photon flux in soft x-ray spectral region. This tabletop source high-photon x rays will, example, enable...
High harmonic generation (HHG) at a high repetition rate requires tight focusing of the moderate peak power driving pulses. So far conversion efficiencies that have been achieved in this regime are orders magnitude behind values demonstrated with loose energy (high power) lasers. In contribution, we discuss scaling laws for main physical quantities HHG and particular analyze limiting effects: dephasing, absorption plasma defocusing. It turns out phase-matched absorption-limited can be even...
We present a rigorous study on the impact of atmospheric molecular absorption linear propagation ultrashort pulses in mid-infrared wavelength region. An ultrafast thulium-based fiber laser was employed to experimentally investigate ultrashort-pulse through atmosphere spectral region containing several strong lines. The profile causes significant degradation pulse quality time domain as well distortion transverse beam spatial domain. Numerical simulations carried out small signal limit...
We present a straightforward route for extreme pulse compression, which relies on moderately driving self-phase modulation (SPM) over an extended propagation distance. This avoids that other detrimental nonlinear mechanisms take and deteriorate the SPM process. The long is obtained by means of hollow-core fiber (HCF), up to 6 m in length. concept potentially scalable TW peak powers at kW average power level. As proof concept, we demonstrate 33-fold compression 1 mJ, kHz, 170 fs Yb laser down...
We report on a Yb:YAG Innoslab laser amplifier system for generation of subpicsecond high energy pump pulses optical parametric chirped pulse amplification (OPCPA) at repetition rates. Pulse energies up to 20 mJ (at 12.5 kHz) and rates 100 kHz were attained with durations 830 fs average power in excess 200 W. further investigate the possibility use subpicosecond derive stable continuum YAG crystal OPCPA seeding.
Divided-pulse amplification is a promising method for the energy scaling of femtosecond laser amplifiers, where pulses are temporally split prior to and coherently recombined afterwards. We present that uses an actively stabilized setup with separated stages splitting combining. The additional degrees freedom can be employed mitigate limitations originating from saturation amplifier cannot compensated in passive double-pass configurations using just one common stage pulse In first...
Optical parametric amplifiers (OPAs) have the reputation of being average power scalable due to instantaneous nature process (zero quantum defect). This Letter reveals serious challenges originating from thermal load in nonlinear crystal caused by absorption. We investigate these effects high OPAs based on beta barium borate. Absorption both pump and idler waves is identified contribute significantly heating crystal. A temperature increase up 148 K with respect environment observed...
In this Letter, we report on a femtosecond fiber chirped-pulse-amplification system based the coherent combination of output four ytterbium-doped large-pitch fibers. Each single channel delivers peak power about 6.2 GW after compression. The combined emits 200 fs long pulses with pulse energy 5.7 mJ at 230 W average together an excellent beam quality. resulting is 22 GW, which to best our knowledge highest value directly emitted from any fiber-based laser system.
Coherent Diffraction Imaging is a technique to study matter with nanometer-scale spatial resolution based on coherent illumination of the sample hard X-ray, soft X-ray or extreme ultraviolet light delivered from synchrotrons more recently Free-Electron Lasers. This robust simultaneously allows quantitative amplitude and phase contrast imaging. Laser-driven high harmonic generation XUV-sources allow table-top realizations. However, low conversion efficiency lab-based sources imposes either...
We report on a highpower femtosecond fiber chirped-pulse amplification system with an excellent beam quality (M(2)=1.2) operating at 250 MHz repetition rate. demonstrate nonlinear compression in solid-core photonic crystal unprecedented average power levels. By exploiting self-phase modulation subsequent chirped-mirror we achieve pulse shortening by more than one order of magnitude to 23 fs pulses. The use circular polarization allows higher usual peak powers the broadening resulting...
Unraveling and controlling chemical dynamics requires techniques to image structural changes of molecules with femtosecond temporal picometer spatial resolution. Ultrashort-pulse x-ray free-electron lasers have significantly advanced the field by enabling pump-probe schemes. There is an increasing interest in using table-top photon sources enabled high-harmonic generation ultrashort-pulse for such studies. We present a novel source driven 100 kHz fiber laser system, which delivers 1011...
We review the main challenges and give design guidelines for high-peak-power high-average-power fiber-based chirped-pulse amplification (CPA) systems. It is clearly pointed out that lowest order fiber nonlinearity (NL), namely self-phase modulation, limits scalability of high-energy ultrashort pulse amplifiers. Therefore, a distinguished difference arises between consequences accumulated nonlinear phase originating from envelope initial weak modulations, resulting in strong recommendation to...
Incorporation of coherent combination into a state-of-the-art fiber-chirped pulse amplification system obtains 1.1 mJ, 340 fs pulses with up to 280 W average power at 250 kHz repetition rate. Propagation this laser inside krypton-filled hollow-core fiber results in significant spectral broadening. Chirped mirrors are used compress the 26 fs, 540 μJ (135 W) leading peak more than 11 GW. This unprecedented high and ultrashort opens new possibilities multidimensional surface science soft x-ray...
Extreme ultraviolet (XUV) lasers are essential for the investigation of fundamental physics.Especially high repetition rate, photon flux sources major interest reducing acquisition times and improving signal to noise ratios in a plethora applications.Here, an XUV source based on cascaded frequency conversion is presented, which delivers due drastic better single atom response short wavelength drivers, average output power 832 ± 204 µW at 21.7 eV.This highest produced by any HHG this spectral...
Resonances in the photoabsorption spectrum of generating medium can modify high-order harmonics. In particular, window-type Fano resonances reduce within a narrow spectral region and, consequently, lead to an enhanced emission harmonics absorption-limited generation conditions. For high harmonic argon it is shown that 3s3p(6)np(1)P(1) window (n = 4, 5, 6) give rise photon yield. 3s3p(6)4p(1)P(1) resonance at 26.6 eV allows relative enhancement up factor 30 100 meV bandwidth compared...