Nora Goossen-Schmidt

Ferdinand-Braun-Institut

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Papers

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Research Field

Resin acids of the oleoresins of conifers growing in Transcarpathia

Chemistry of Natural Compounds (1987)

V. I. Bol'shakova L. I. Demenkova Nora Goossen-Schmidt V. A. Pentegova

Oleoresin

10.1007/bf00598751

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Citations (1)

Collection of sulfur gases with chemically-treated filters

G.R. Namie R.F. Reardon Nora Goossen-Schmidt L.L. Spiller

Chemically treated membrane filters were evaluated to collect hydrogen sulfide and sulfur dioxide. Four chemical treatments were tested. Silver nitrate-- and silver nitrate--tartaric acid--treated filters were used to collect hydrogen sulfide, and lithium hydroxide-- and potassium bicarbonate--treated filters were used to collect sulfur dioxide. Sampling was performed using a tandem filter holder so that the test gas would pass through each filter in sequence. A pre-filter was used to remove the aerosol component. For collecting hydrogen sulfide, the silver nitrate--treated filters had an efficiency of 84% when used with a flow rate of 1.0 l/min; for collecting sulfur dioxide, the lithium hydroxide--treated filters had an efficiency of 85% at 1.0 l/min. It was found that the silver nitrate--treated filters began to absorb sulfur dioxide after several days; thus, the test gas should pass through the lithium hydroxide--treated filter prior to the silver nitrate--treated filter.

Silver nitrate

Nitric acid

Lithium hydroxide

Potassium hydroxide

Sodium hydroxide

Acid gas

Filtration (mathematics)

Source

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Red-Emitting Distributed Bragg Reflector Lasers for Strontium-Based Optical Atomic Clocks

Nora Goossen-Schmidt Christoph Pyrlik Bassem Arar Muhammad Tehwar Hassan Ahmad Bawamia

Optical atomic clocks based on the spectroscopy of strontium (Sr) atoms currently provide the most accurate time and frequency measurements. They reach fractional frequency uncertainties in the range of 10 ⁻¹⁸ [1], which makes them promising candidates for the redefinition of the second and for improving, for example, the accuracy of satellite navigation.

Reflector (photography)

10.1109/cleo/europe-eqec57999.2023.10232507

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Intrinsic refractive index matched 3D dSTORM with two objectives: Comparison of detection techniques

Scientific Reports (2018)

Nora Goossen-Schmidt Martin Kahms Jana Hüve Jürgen Klingauf

We have built a setup for 3D single molecule localisation microscopy (SMLM) where a very high resolution is achieved by, firstly, the use of two objectives instead of one and, secondly, minimizing optical aberrations by refractive index matching with a glycerol-water mixture as immersion medium in conjunction with glycerol-immersion objectives. Multiple optical paths of the microscope allow to switch between astigmatic and interferometric localisation along the optical axis, thus enabling a direct comparison of the performance of these localisation methods.

Immersion

10.1038/s41598-018-31595-z

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Citations (7)

Distributed Bragg Reflector Lasers at 689.45 nm for Sr Spectroscopy

Conference on Lasers and Electro-Optics (2022)

Nora Goossen-Schmidt Christoph Pyrlik Muhammad Tehwar Hassan Ahmad Bawamia J. Fricke

We present distributed Bragg reflector lasers optimized for strontium-based quantum technology applications at 689.449 nm. The devices achieved optical output powers up to 88 mW, four times more than previously reported, and a spectral linewidth of 0 . 4MHz.

Laser linewidth

Reflector (photography)

10.1364/cleo_at.2022.am2d.2

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Micro-integrated diode laser modules for operation in quantum technology applications

Janpeter Hirsch Marcel Bursy Martin Gärtner Stephanie Gerken Nora Goossen-Schmidt

We present our next-generation micro-integrated diode laser modules. Based on the ECDL-MOPA concept, the modules allow independent tuning of emission frequency and output power. They currently operate at 689, 767, 780 and 794 nm, but can also be adapted for other wavelengths. The modules achieve mode-hop-free tuning even beyond the free spectral range of the laser. Additionally, we realized a Bragg grating based frequency reference using the same technology. It demonstrates high stability and a wide tuning range. Currently, we expand the application of the technology towards distribution modules that efficiently split and shift laser signals for seamless transmission.

10.1117/12.3002234

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Switching behaviour of dSTORM dyes in glycerol-containing buffer

Scientific Reports (2020)

Nora Goossen-Schmidt Marco Schnieder Jana Hüve Jürgen Klingauf

Abstract To suppress optical aberrations caused by refractive index mismatch, we employ glycerol-immersion objectives in conjunction with fused silica cover glasses and imaging buffers with a high glycerol content. Here we demonstrate that the addition of glycerol to the buffer does not degrade the switching behaviour of the dyes Alexa Fluor 647 and Alexa Fluor 568 in dSTORM measurements, which shows that this approach is suitable for dSTORM. Additionally, we report evidence that sealed sample geometries as used in our experiments reduce photobleaching due to the lower influx of oxygen into the imaging buffer.

Buffer (optical fiber)

Alexa Fluor

10.1038/s41598-020-70335-0

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Citations (17)

Interferometric measurement of refractive indices

Review of Scientific Instruments (1988)

K. Betzler A. Gröne Nora Goossen-Schmidt Pablo Nuñez von Voigt

A simple method for the measurement of the refractive indices of parallel plate samples is described that uses the shift of the interference pattern when rotating the sample in one arm of a Mach–Zehnder interferometer. The theoretical fringe pattern shift is calculated and the accuracy of the method is derived. A typical accuracy of about 10−4 can be achieved at low refractive indices. The method is especially useful when—because of other reasons—the samples are provided as plates or when prisms are difficult to fabricate.

Sample (material)

Accuracy and precision

10.1063/1.1139853

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Citations (34)

High Power Distributed Bragg Reflector Lasers at 689.45 nm for Quantum Technology Applications

IEEE Photonics Technology Letters (2021)

Christoph Pyrlik Nora Goossen-Schmidt Muhammad Tehwar Hassan Ahmad Bawamia J. Fricke

Distributed Bragg Reflector semiconductor lasers are ideally suited for quantum technology applications due to their high efficiency, small footprint, and tunability in combination with the frequency stability provided by an integrated frequency selective element. Here we present the design, fabrication, and electro-optical characterization of DBR lasers optimized for strontium-based quantum technology applications at 689.449 nm. The devices achieved an optical output power of up to 88 mW, four times more than previously reported, as well as a spectral linewidth of 0.4 MHz.

Laser linewidth

10.1109/lpt.2021.3139433

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Citations (6)

Dual-Objective Pointillism Microscopy Setup with Interferometric and Astigmatic Detection

Biophysical Journal (2015)

Nora Goossen-Schmidt Jana Hüve Jürgen Klingauf

Interference microscopy

10.1016/j.bpj.2014.11.2600

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