A5084605608- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Spectroscopy and Laser Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Terahertz technology and applications
- Photonic Crystal and Fiber Optics
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Quantum Chemical Studies
- Solid State Laser Technologies
- Photonic and Optical Devices
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Chemometric Analyses
- Advanced Chemical Physics Studies
- Advanced Fiber Optic Sensors
- Photorefractive and Nonlinear Optics
- Superconducting and THz Device Technology
- Gyrotron and Vacuum Electronics Research
- Mechanical and Optical Resonators
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Sensors
- Photochemistry and Electron Transfer Studies
- Optical Coatings and Gratings
- Laser Material Processing Techniques
- Wireless Communication Networks Research
- Millimeter-Wave Propagation and Modeling
Max Planck Institute of Quantum Optics
2016-2025
Ludwig-Maximilians-Universität München
2016-2025
Leibniz Institute of Photonic Technology
2023-2025
Technologies pour la Santé
2024-2025
Digital Research Alliance of Canada
2024-2025
Joint Attosecond Science Laboratory
2025
University of Kaiserslautern
2024
Friedrich Schiller University Jena
2018-2024
University of Koblenz and Landau
2024
Max Planck Society
2009-2019
We improve the existing data extraction algorithms for THz time-domain spectroscopy (THz TDS) in two aspects. On one hand, we merge up-to-date knowledge of TDS signal processing into a single powerful optical material parameter algorithm. other introduce novel iterative algorithm that further enhances accuracy extraction. In contrast to most published experiments, are able reliably investigate samples with thicknesses as small 100microm, low indexes refraction, i.e. close 1, well sharp peaks curves.
The development of high-power, broadband sources coherent mid-infrared radiation is currently the subject intense research that driven by a substantial number existing and continuously emerging applications in medical diagnostics, spectroscopy, microscopy, fundamental science. One major, long-standing challenges improving performance these has been construction compact, sources, which unify properties high brightness spatial temporal coherence. Due to lack such several can be addressed only...
We report a coherent mid-infrared (MIR) source with combination of broad spectral coverage (6-18 μm), high repetition rate (50 MHz), and average power (0.5 W).The waveform-stable pulses emerge via intrapulse differencefrequency generation (IPDFG) in GaSe crystal, driven by 30-W-average-power train 32-fs spectrally centered at 2 μm, delivered fiber-laser system.Electro-optic sampling (EOS) the MIR waveforms reveals their single-cycle nature, confirming excellent phase matching both IPDFG EOS...
Human biofluids serve as indicators of various physiological states, and recent advances in molecular profiling technologies hold great potential for enhancing clinical diagnostics. Leveraging developments laser-based electric-field fingerprinting, we assess its vitro In a proof-of-concept study involving 2533 participants, conducted randomized measurement campaigns to spectroscopically profile bulk venous blood plasma across lung, prostate, breast, bladder cancer. Employing machine...
A passive optical resonator is used to enhance the power of a pulsed 78MHz repetition rate Yb laser providing 200fs pulses. We find limitations relating achievable time-averaged and peak power, which we distinguish by varying duration input An intracavity average 18kW generated with close Fourier-limited pulses 10W power. Beyond this level, intensity-related effects lead instabilities, can be removed chirping seed By extending pulse in way 2ps, could obtain 72kW circulating 50W
Ultrafast spectroscopy in the extreme ultraviolet demands for ever-higher pulse repetition rates and photon energies. Here, we drive cavity-enhanced high-order harmonic generation (HHG) at a rate of 250 MHz, with 30 fs pulses an average power 10 kW. Employing optimized cavity geometry high-pressure gas target, couple out nanowatt-level harmonics energies around 100 eV. This constitutes improvement more than two orders magnitude over previous megahertz-repetition-rate HHG experiments paves...
We investigate power scaling of ultrashort-pulse enhancement cavities. propose a model for the sensitivity cavity design to thermal deformations mirrors due high circulating powers. Using this and optimized mirrors, we demonstrate 400 kW average with 250 fs pulses 670 10 ps at central wavelength 1040 nm repetition rate MHz. These results represent an improvement one order magnitude compared state-of-the-art systems similar pulse durations will thus benefit numerous applications such as...
Abstract Laser-dressed photoelectron spectroscopy, employing extreme-ultraviolet attosecond pulses obtained by femtosecond-laser-driven high-order harmonic generation, grants access to atomic-scale electron dynamics. Limited space charge effects determining the admissible number of photoelectrons ejected during each laser pulse, multidimensional (i.e. spatially or angle-resolved) spectroscopy solids and nanostructures requires high-photon-energy, broadband high sources operating at...
We consider the design of practical interleavers for interleaver division multiple access (IDMA) systems. A set is considered to be if it satisfies two criteria: 1) It easy generate (i.e., transmitter and receiver need not store or communicate many bits in order agree upon an interleaver), 2) no "collide". show that a properly defined correlation between can used formulate collision criterion, where zero-correlation orthogonality) implies collision. Computing among non-orthogonal generally...
Isolated attosecond pulses (IAPs) produced through laser-driven high-harmonic generation (HHG) hold promise for unprecedented insight into biological processes via x-ray diffraction with tabletop sources. However, efficient scaling of HHG towards energies has been hampered by ionization-induced plasma impeding the coherent buildup radiation. Recently, it shown that these limitations can be overcome in so-called 'overdriven regime' where ionization loss and dispersion strongly modify driving...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We extract the optical material parameters of a layer within multilayer sample from terahertz (THz) time-domain spectroscopy data. To this aim, we derive suited transfer function for structures in general and use recently introduced spatially variant moving average filter to improve accuracy algorithm. demonstrate two applications our method experimentally: determination thickness an unknown on...
In passive enhancement cavities the achievable power level is limited by mirror damage.Here, we address design of robust optical resonators with large spot sizes on all mirrors, a measure that promises to mitigate this limitation decreasing both intensity and thermal gradient surfaces.We introduce misalignment sensitivity metric evaluate robustness resonator designs.We identify standard bow-tie operated close inner stability edge as most large-mode cavity implement two spherical mirrors 600...
Since the advent of femtosecond lasers, performance improvements have constantly impacted on existing applications and enabled novel applications. However, one feature bearing potential a quantum leap for high-field is still not available: simultaneous emission extremely high peak average powers. Emerging such as laser particle acceleration require exactly this regime and, therefore, challenge technology at large. On hand, canonical bulk systems can provide pulse powers in multi-terawatt to...
Metallic spintronic terahertz (THz) emitters have become well-established for offering ultra-broadband, gapless THz emission in a variety of excitation regimes, combination with reliable fabrication and excellent scalability. However, so far, their potential high-average-power to reach strong fields at high repetition rates has not been thoroughly investigated. In this article, we explore the power scaling behavior tri-layer using an Yb-fiber source, delivering average 18.5 W (7 incident on...
Electro-optic sampling of infrared electric fields has set sensitivity and dynamic-range records in broadband molecular vibrational spectroscopy. Yet, these works, the 1-second-scale single-trace acquisition time leads to intra-scan noise accumulation restricts throughput measurements multiple samples dynamic processes. We present a dual-laser-oscillator approach capturing 2800 mid-infrared waveforms per second by scanning relative delay between sampled waveform gate pulses using modulated...
We introduce and experimentally validate a pulse picking technique based on travelling-wave-type acousto-optic modulator (AOM) having the AOM carrier frequency synchronized to repetition rate of original train.As consequence, phase noise characteristic train is largely preserved, rendering this suitable for applications requiring carrier-envelope stabilization.In proof-ofprinciple experiment, 1030-nm spectral part an 74-MHz, carrierenvelope stable Ti:sapphire oscillator amplified reduced in...
We combine high-finesse optical resonators and spatial-spectral interferometry to a highly phase-sensitive investigation technique for nonlinear light-matter interactions. experimentally validate an ab initio model the response of resonator housing gas target, permitting global optimization intracavity conversion processes like high-order harmonic generation. predict feasibility driving generation far beyond intensity limitations observed in state-of-the-art systems by exploiting...
We demonstrate a high-finesse femtosecond enhancement cavity with an on-axis obstacle. By inserting wire width of 5% the fundamental mode diameter, finesse F = 3400 is only slightly reduced to 3000. The low loss due degeneracy transverse modes, which allows for exciting circulating field distribution avoiding call this condition quasi-imaging. concept could be used output coupling intracavity-generated higher-order harmonics through opening in one mirrors.
We theoretically and experimentally investigate high-harmonic generation in a 78-MHz enhancement cavity with transverse mode having on-axis intensity maxima at the focus minima an opening following mirror. find that conversion efficiency is comparable to achievable Gaussian mode, whereas output coupling can be significantly improved over any other demonstrated technique. This approach offers additional power scaling advantages degrees of freedom shaping harmonic emission, paving way...
We address the challenge of increasing bandwidth high-finesse femtosecond enhancement cavities and demonstrate a broad spectrum spanning 1800 cm-1 (195 nm) at -10 dB around central wavelength 1050 nm in an EC with average finesse exceeding 300. This will benefit host spectroscopic applications, including transient absorption spectroscopy, direct frequency comb Raman spectroscopy. The pulse circulating is composed only 5.4 optical cycles, kilowatt-level power. Together suitable gating...