A5103215833- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Terahertz technology and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Orbital Angular Momentum in Optics
- Mass Spectrometry Techniques and Applications
- Photonic Crystal and Fiber Optics
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Laser Applications
- Ocular and Laser Science Research
- Laser Material Processing Techniques
- Biosensors and Analytical Detection
- Nonlinear Optical Materials Studies
- Mechanical and Optical Resonators
- Quantum, superfluid, helium dynamics
- Quantum optics and atomic interactions
- Ionosphere and magnetosphere dynamics
- Strong Light-Matter Interactions
- Near-Field Optical Microscopy
- Spectroscopy and Chemometric Analyses
- Photorefractive and Nonlinear Optics
Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy
2021-2024
Leibniz University Hannover
2013-2021
Plasmonic dimer nanoantennas can significantly boost the electric field strength in gap region, allowing for a modification of feed geometry by femtosecond laser illumination.Using resonant bowtie antennas to enhance low-fluence oscillator, here we experimentally demonstrate highly localized reshaping antennas, resulting self-optimization antenna shape.From high-resolution scanning electron micrographs and two-dimensional energy dispersive x-ray maps, analyze near-field enhanced...
We employ a broadband Ti:sapphire femtosecond oscillator to simultaneously launch two localized surface plasmon modes in rectangular plasmonic nanoholes. The resonant frequencies of these match well with our laser spectrum. As result, the nanoholes do not only efficiently boost third harmonic radiation intensity, but also significantly broaden harmonic's bandwidth, producing nanoscale deep-ultraviolet light source range 240 300 nm. Due involvement modes, beam becomes elliptically polarized...
We experimentally investigate the interaction between hybrid-morphology gold optical antennas and a few-cycle Ti:sapphire laser up to ablative intensities, demonstrating rich nonlinear plasmonic effects promising applications in coherent frequency upconversion nanofabrication technology. The two-dimensional array of hybrid consists elliptical apertures combined with bowties its minor axis. resonance is red-shifted respect central thus mainly enhances third harmonic spectrum at long...
Ultrafast visible radiation is of great importance for many applications ranging from spectroscopy to metrology. Because some regions in the range are not covered by laser gain media, optical parametric oscillators offer an added value. Besides a high-power broadband source, ability rapidly tune frequency pulses with spectral density offers extra benefit experiments such as multicolor or imaging. Here, we demonstrate broadband, high-power, tunable femtosecond noncollinear oscillator signal...
Abstract Understanding the fundamentals of laser-matter interactions is crucial for developing and optimizing ultrafast laser processing strategies. In optically transparent solids, key event by which energy deposited in material through generation an electron–hole plasma via nonlinear excitation mechanisms. As stored relaxes, local distortions lattice may occur, such as point defects. These defects give rise to new discrete states located bandgap. this study, we investigate how presence...
In doubly resonant optical parametric oscillators (DROPOs), it is possible to generate, enhance, and phase lock two frequencies at once. Following intracavity conditions, a complex tuning behavior of the signal idler spectra takes place in DROPOs, cumulating into degeneracy with self-locking coherent wavelength doubling. this work, we identify group delay matching as important parameter determining global demonstrate key role higher-order dispersion spectral dependencies. Applicationwise,...
Under illumination of a Ti:sapphire femtosecond oscillator, amplification third harmonic generation by subwavelength plasmonic apertures is observed. However, the yield efficiency decays rapidly over time. In this work we investigate physical phenomena behind temporal attenuation signal. From high-resolution scanning electron micrographs and two-dimensional energy dispersive X-ray maps, conclude that attributed to trapping low-density carbon layer inside apertures. Furthermore, show profile...
Get PDF Email Share with Facebook on X Post reddit LinkedIn Add to Mendeley BibSonomy WeChat Citation Copy Text B. Kreipe, J. R. C. de Andrade, Kränkel, and U. Morgner, "Kerr-lens mode-locked Yb3+:Lu2O3 thin-disk laser," in Conference Lasers Electro-Optics, OSA Technical Digest (2016) (Optica Publishing Group, 2016), paper SM1I.4. Export BibTex Endnote (RIS) HTML Plain alert Save article
Ultrafast detection of microplastic particles is becoming a vital problem, as these are found in water sources worldwide. Ideally, live analysis flow desirable to directly monitor the quality for contaminations. Therefore, coherent Raman spectroscopy techniques require fast and broadband tunable lasers address all relevant spectral regions investigated samples. In our work, we combine high power non-collinear optical parametric oscillator with real-time stimulated scattering setup. The light...
``Bowtie'' nanoantennas are not unusual in the field of plasmonics, yet they still can be used ways. Harnessing near-field enhancement due to locally resonant surface plasmons, authors demonstrate material ablation and concurrent deposition high-quality film at subwavelength scale, all driven by a bowtie-based oscillator, rather than laser. This gentle is mediated hot-electron emission electrostatic acceleration---a different mechanism for thermal or optical breakdown. made work either...
We present a novel concept for the stabilization of carrier-envelope offset (CEO) frequency femtosecond pulse trains from thin-disk laser oscillators by exploiting gain depletion modulation in active region. shine small fraction output power back onto thin disk allowing population inversion medium to be controlled. employ this technique our home-built Kerr-lens mode-locked Yb:YAG and benchmark performance against proven pump current CEO stabilization, showing that two techniques have...
We present a fast-tunable femtosecond NIR NOPO simultaneously delivering visible pulses from 412 to 500 nm generated via efficient intracavity sum-frequency generation and rapidly tunable over the whole range by varying resonator length only.
We propose to use diabolo nanoantennas for experimentally investigating the origin of enhanced third harmonic generation by localized surface plasmon polaritons. In such a geometry, opposing apexes bowties are electrically connected thin gold nanorod, which has two important functions in discriminating point generation. First, inserted nanorod shifts field enhancement area be far away from dielectric substrate material. Next, accumulation free charges at adjacent bowtie tips produces strong...
In the last few decades development of ultrafast lasers has revolutionized our ability to gain insight into light-matter interactions. The appearance few-cycle light sources available from visible mid-infrared spectral range and attosecond extreme ultraviolet x-ray technologies provide for first time possibility directly observe control electron dynamics in matter on their natural scale. However, few-fs have hardly been deep (DUV; 4-6 eV, 300-200 nm) are unavailable vacuum (VUV; 6-12 200-100...
Single-resonant and (signal/idler) double-resonant optical parametric oscillators differ fundamentally on the conversion efficiency back to pump wave. The nonpresent idler in single-resonant case allows for signal intracavity enhancement well beyond power level. This paper answers question, how phase-matched a doubly-resonant system can be overcome reveal substantial enhancement, what parameters it depends on. In degenerate OPO (DROPO) pumped by thin-disk oscillator, an up factor of four is...
Energetic ultrashort visible pulses especially at high repetition rates are beneficial for wide fields of applications, e.g., ultrafast spectroscopy and nonlinear imaging [1] , [2] . In wavelength regions where no suitable laser gain material is available to provide those pulses, a well-established technique the generation optical parametric amplification (OPA) [3]
We study the nonlinear behavior and thermal stability of bowtie nanoantennas both theoretically experimentally to understand their suitability for high harmonic generation in gaseous media [1, 5, 6]. The obtained results are compared those literature.
We discuss the limits and potential of a 4-f prism-based pulse shaper for compression ultra-broadband spectra from two-color OPCPA supporting single-cycle pulses in visible. Furthermore, we investigate feasible characterization techniques.
In this contribution we will discuss the limits and potential of a 4-f prism-based pulse shaper for compression ultra-broadband spectra supporting single-cycle pulses in visible.