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Dielectric Fibres for Low-Loss Transmission of Millimetre Waves and its Application in Couplers and Splitters
We present a dielectric fibre and two splitters made of polyethylene, which are well suited for the guidance of millimeter waves. A successful construction of a 3-dB coupler and a 1×4 splitter is reported....
PublikationenA local characterization of smooth projective planes
In 2000, Bödi and Immervoll considered compact, connected smooth incidence geometries with mutually transversal point rows and tually transversal line pencils. They made the very natural assumptions the...
PublikationenHighly Accurate THz Time-Domain Spectroscopy of Multilayer Structures
We extract the optical material parameters of a layer within a multilayer sample from terahertz (THz) time-domain spectroscopy data. To this aim, we derive a suited transfer function for multilayer structures...
PublikationenHighly accurate optical material parameter determination with THz time-domain spectroscopy
We improve the existing data extraction algorithms for THz time-domain spectroscopy (THz TDS) in two aspects. On the one hand, we merge the up-to-date knowledge of THz TDS signal processing into a single...
PublikationenHighly sensitive dispersion measurement of a high-power passive optical resonator using spatial-spectral interferometry
We apply spatially and spectrally resolved interferometry to measure the complex ratio between the field circulating inside a high-finesse femtosecond enhancement cavity and the seeding field. Our simple...
PublikationenPower scaling of a high-repetition-rate enhancement cavity
A passive optical resonator is used to enhance the power of a pulsed 78 MHz repetition rate Yb laser providing 200 fs pulses. We find limitations relating to the achievable time-averaged and peak power,...
PublikationenOptimization and characterization of a highly-efficient diffraction nanograting for MHz XUV pulses
We designed, fabricated and characterized a nano-periodical highly-efficient blazed grating for extreme-ultraviolet (XUV) radiation. The grating was optimized by the rigorous coupled-wave analysis method...
PublikationenDegree of Dispersion of Polymeric Compounds Determined With Terahertz Time-Domain Spectroscopy
Terahertz spectroscopy has been presented as a new technique for analyzing the degree of dispersion of polymeric compounds. It is a contact-free and non-destructive technique that can also be used to monitor...
PublikationenTransverse mode tailoring in a quasi-imaging high-finesse femtosecond enhancement cavity
We demonstrate a high-finesse femtosecond enhancement cavity with an on-axis obstacle. By inserting a wire with a width of 5% of the fun-damental mode diameter, the finesse of F = 3400 is only slightly...
PublikationenLarge-mode enhancement cavities
In passive enhancement cavities the achievable power level is limited by mirror damage. Here, we address the design of robust optical resonators with large spot sizes on all mirrors, a measure that promises...
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