6814 Suchergebnisse für: „“
Assembling gold nanoparticle chains using an AC electrical field: Electrical detection of organic thiols
Here we present the utilization of gold nanoparticle (AuNP) chains assembled between two electrodes using an AC electrical field as a potential nanosensor for molecular detection. We describe an easy way...
PublikationenSurface-metalized polymer nanogratings as high-sensitive Raman-substrates
Raman spectroscopy is a modern and attractive optical tool in chemical and biological applications [1][2]. The detection limit of this method down to lowest concentrations is given by the inherent small...
PublikationenLight-shift suppression in a miniaturized Mx optically pumped Cs magnetometer array with enhanced resonance signal using off-resonant laser pumping
The performance of an optically pumped M_x magnetometer with miniaturized Cs cell at earth's magnetic field strength (50µT) is investigated. Operation using detuned laser light of high intensity is shown...
PublikationenExploiting extreme coupling to realize a metamaterial perfect absorber
An optical metamaterial which uses the effect of strong coupling between closely spaced nanostructured gold metal plates and a planar gold substrate was realized by means of electron beam lithography and...
PublikationenEfficient Yb laser fibers with low photodarkening by optimization of the core composition
We report on photodarkening (PD) investigations at Yb doped fibers with specific variation of the concentrations of the codopants aluminum and phosphorus, measured during cladding pumping at 915 nm. A...
PublikationenPhotodarkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power
Photodarkening in Yb doped fibers was examined at 633 nm insitu during cladding pumping at 915 nm with varying pump powers and with no indication of an onset threshold. For the first time, the partial...
PublikationenPhotodarkening kinetics as a function of Yb concentration and the role of Al codoping
We investigated the photodarkening (PD) kinetics of two fiber series with variation of the Yb content for constant host glass composition or constant ratio of Al/Yb, respectively. The results show the...
PublikationenIn-Fiber Temperature Measurement during Optical Pumping of Yb-doped Laser Fibers
The knowledge of temperature effects in rare-earth doped fibers is of great interest in order to improve the performance and stability of monolithic fiber lasers and fiber amplifiers. Fiber Bragg gratings...
PublikationenGrowth Characterization of Fiber Bragg Gratings Inscribed in Different Rare-earth-doped Fibers by UV and VIS Femtosecond Laser Pulses
Besides well-known applications of fiber Bragg gratings (FBGs) in sensing and telecommunication, current research focuses also on an integration of gratings in actively doped fibers in order to realize...
PublikationenApplicability of input coupling taper transitions for supercontinuum generation in nanoscale all-normal dispersion optical fibers
Supercontinuum generation in nanoscale all-normal dispersion optical fibers requires special attention concerning the input coupling of light due to the small core size. Preceding taper transitions along...
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