A5027943065- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- 2D Materials and Applications
- Plasmonic and Surface Plasmon Research
- Glass properties and applications
- Solid State Laser Technologies
- Perovskite Materials and Applications
- Laser-Matter Interactions and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Thermal Radiation and Cooling Technologies
- Laser Design and Applications
- Optical properties and cooling technologies in crystalline materials
- Material Properties and Applications
Fraunhofer Institute for Applied Optics and Precision Engineering
2023-2024
Leibniz Institute of Photonic Technology
2018-2022
Friedrich Schiller University Jena
2017-2018
Abstract Atomically thin transition metal dichalcogenides are highly promising for integrated optoelectronic and photonic systems due to their exciton‐driven linear nonlinear interactions with light. Integrating them into optical fibers yields novel opportunities in communication, remote sensing, all‐fiber optoelectronics. However, the scalable reproducible deposition of high‐quality monolayers on is a challenge. Here, chemical vapor monolayer MoS 2 WS crystals core microstructured...
We present detailed measurements of laser relevant cross sections thulium doped yttrium-aluminum-garnet (Tm:YAG) and yttrium-aluminum-perovskite (Tm:YAP), including the absorption for H63 to H43 transition near 800 nm, emission transitions between F43 manifolds in short-wavelength infrared region. For Tm:YAP we data all polarization axes. The were carried out at temperatures ranging from 80 K 300 K. Furthermore, re-absorption free fluorescence lifetimes 77 K, 200 295 obtained using pinhole...
Abstract Here, the concept of generating higher‐order dispersive waves (DWs) via quasi‐phase‐matching (QPM) in periodically dispersion‐modulated liquid‐core fibers are demonstrated by distinct narrowband sidebands generated outside conventional supercontinuum (SC) spectrum. Through controlled partial core collapse, commonly used phase‐matching (PM) condition is amended an additional grating‐related term. This results generation ultrashort DWs grating parameters, extending SC spectrum up to 3...
Thulium-doped fiber amplifiers have been limited to average output powers of around 1 kW for over a decade. To achieve multi-kW 2 μm wavelength, we propose using dual-grating Spectral Beam Combining (SBC). Three customized kW-class Tm-doped operating in the 2030-2050 nm range were developed. The consist three stages and are pumped with non-stabilized, fiber-coupled diode lasers at 790 - 795 nm. Singlemode, TMI-free exceeding 800 W, narrow linewidths FWHM ⪅115 pm, achieved subsequently...
Abstract Widely wavelength‐tunable femtosecond light sources in a compact, robust footprint play central role many prolific research fields and technologies, including medical diagnostics, biophotonics, metrology. Fiber lasers are on the verge development of such sources, yet widespan spectral tunability pulses remains pivotal challenge. Dispersive wave generation, also known as Cherenkov radiation, offers untapped potentials to serve these demands. In this work, concept quasi‐phase matching...
Transverse Mode Instabilities (TMI) are a thermally-induced nonlinear effect that results in fluctuating output beam profile unsuited for most applications. Since their first observation Yb-doped amplifiers [1], TMI have manifested as major limitation scaling the average power of high-power fiber lasers. In 2021, been observed Tm-doped well [2], [3]. Recently, Anderson et al. presented 1.1 kW at 1950 nm [3] and 905 W 2040 [4] 20/400μm geometry, both pumped with diode lasers wavelength around...
Abstract Efficient supercontinuum generation demands for fine‐tuning of the dispersion underlying waveguide. Resonances introduced into waveguide systems can substantially improve nonlinear dynamics in ultrafast via modal hybridization and formation avoided crossings. Using example exposed core fibers functionalized by nanofilms with sub‐nanometer precision both zero‐dispersion dispersive wave emission wavelengths are shifted 227 300 nm, respectively, at tuning slopes higher than 20 nm/nm....
Here, we present a fully fiber-integrated semiconductor wire based photoconductor for the photodetection of light at visible and near-infrared wavelengths. The device consisting an electrically connected micrometer sized germanium running parallel to single-mode core gradient index fiber shows features such as temporal responses shorter than 20 ns linear response between 10 nW μW in wavelength domain 600 nm 1300 nm, while powers up 2 mW can be measured. A sophisticated polarization...
Ultrafast supercontinuum generation crucially depends on the dispersive properties of underlying waveguide. This strong dependency allows for tailoring nonlinear frequency conversion and is particularly relevant in context waveguides that include geometry-induced resonances. Here, we experimentally uncovered impact relative spectral distance between pump bandgap edge particular wave formation example a liquid strand-based photonic fiber. In contrast to its air-hole-based counterpart, fiber...
Power scaling of fiber lasers has always been pursued, being limited by nonlinear effects and heat generation in the active various components. Among most critical components are cladding light strippers (CLS) between amplifier chains, removing from leaked higher order modes, unabsorbed pump or losses splices Polymer-based CLS work sufficiently well for near-IR including wavelength at 793 nm but suffer high absorption signal near 2 μm have not evaluated detail this regime. Therefore, it...
Nonlinear frequency conversion is a pathway to unlock undiscovered physics and implement tailored light sources for spectroscopy or medicine. A key challenge the establishment of spectrally flat outputs, which particularly demanding in context soliton-based at low pump energy. Here, we introduce concept controlling nonlinear by longitudinally varying resonances, allowing shaping soliton dynamics achieving broadband spectra with substantial spectral flatness. Longitudinally resonances are...
Similar to ytterbium doped laser materials operation with thulium media is possible within a quasi-three level scheme, which especially for pulse pumped lasers drawback efficient operation, as significant amount of energy required bleach out the medium. Since this cannot be extracted, it lost amplification process. Hence, such at cryogenic temperatures seems an appropriate solution. For further modeling and derivation design rules future systems based on scheme reliable spectral data needed....
Here we introduce the concept of electrically tuning surface plasmon polaritons using current-driven heat dissipation, allowing controlling plasmonic properties via a straightforward-to-access quantity. The key idea is based on an electrical current flowing through layer, changing dispersion and phase-matching condition temperature-imposed modification refractive index one dielectric media involved. This scheme was experimentally demonstrated example connected fiber taper that has...
Wavelength-tunable femtosecond light sources are essential in various research fields and technologies, including medical diagnostics, biophotonics, metrology. Although fiber lasers have emerged as leaders the development of such sources, achieving wide spectral tunability for pulses remains a significant challenge. To address this challenge, dispersive wave generation offers powerful solution. In study, we exploit concept quasi-phase matching to enable multi-order formation with...
We use exposed core optical fibers, coated with single-layer MoS 2 and WS crystals, grown in place, to demonstrate in-fiber exciton excitation, photoluminescence collection, enhanced third harmonic generation.
Green lasers are coupled into nanostructured, exposed-core fibers, functionalized with monolayer transition metal dichalcogenide crystals in a scalable chemical vapor deposition process by Antony George, Andrey Turchanin, Falk Eilenberger, and co-workers article number 2003826. The laser light excites excitons the monolayer, re-emiting red photoluminescence fiber. Monolayer-functionalized fibers may be new path toward remote sensing tailored nonlinearities.
Dispersive Waves The optical properties of fibers with exposed cores can be straightforwardly tuned by the deposition high refractive index nano-films (green) inducing tailored resonances. In article number 2103864 Markus A. Schmidt and co-workers, a precise dispersion design supercontinuum generation is enabled through periodically structured nano-films. Multicolor, user-defined femtosecond frequency conversion to higher order dispersive waves quasi-phase matching demonstrated.
Depositing high refractive index nanofilms with controlled thicknesses on exposed core fibers enables thickness tunable supercontinuum generation. Thickness gradients along the fiber allow for optimizing spectral flatness and extension of bandwidth toward infrared.
Transition-metal dichalcogenides [1] (TMDs) are particularly appealing for photonics due to their rich photophysical effects and strong light-matter-interaction per unit length . Two-dimensional (2D) TMDs also exhibit optical nonlinearity [2] which opens up novel potential applications in nonlinear optics. However, the total response of is limited by sub-nanometer interaction length, imposed atomic thickness. Hence, enhancement essential any future application.