Warmumformung von Präzisionsoptiken
Eigenschaften und Präzision der wellenfrontbasierten Justage
Die wellenfrontbasierte Justage bietet einen eleganten Ansatz für die exakte Positionierung der Funktionsflächen und Elemente mehrkomponentiger optischer Systeme. Mit nur einer Messung lässt sich der Systemzustand abbilden und geeignete Korrekturanweisungen aller Freiheitsgrade ableiten. Diese Form der Justage setzt zur Charakterisierung der optisc...
Optical and magnetic control of electron spins in tailored semiconductors
The thesis explores three different approaches for the reciprocal manipulation of polarized light and electron spins in semiconductors. In the first approach, the direct optical orientation and alignment of Mn electron spins in CdMnTe spin glass is demonstrated. The second approach uses a GaAs-based ferromagnet/semiconductor hybrid structure to dem...
Changes of solar cell parameters during damp-heat exposure
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The electrical ageing of photovoltaic modules during extended damp-heat tests at different stress levels is investigated for three types of crystalline silicon photovoltaic modules with different backsheets, encapsulants and cell types. Deploying different stress levels allows determination of an equivalent stress dose function, which is a first st...
Process-induced changes in optical properties of precision molded glass lenses
Effect of thermal insulation of the back side of PV modules in the module temperature
The module temperatures of free-standing modules were compared with identical modules with thermally insulated back side simulating roof integration for 45° south orientation in Freiburg, Germany, at 1000 W/m2 solar irradiation. The thickness of the thermal insulation was varied in order to find a minimum thickness sufficient for suppressing the he...
Model of coating wear degradation in precision glass molding
Coatings in precision glass molding (PGM) experience severe thermo-chemical and thermo-mechanical loads during several hundred or thousand pressing cycles. Until now, little is known about the integrity loss of protective coatings for these applications. Gaining knowledge of fundamental mechanisms on the functional degradation of protective coating...
Breitband-Nahfeldmikroskopie an phonon-resonanten Kristallen
The BabyLux project - an optical neuro-monitor of cerebral oxygen metabolism and blood flow for neonatology
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BabyLux project is driven by the end-users working with academia and industry to develop a hybrid near-infrared diffuse correlation spectroscopy (DCS)/ time resolved spectroscopy (TRS) system to address the challenge of a user-friendly, medical grade device for neonatology.
Injection moulding of optical functional micro structures using laser structured, PVD-coated mould inserts
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