Employing Sensitivity Analysis for Evaluation of Vibration Effects on Multi-Mirror Optomechanical Systems

This study presents a novel approach for evaluating the effects of dynamic disturbances on optical performance using sensitivity analysis. The computation of optical performance for perturbed optical systems is too costly with state-of-the-art analysis software when applied in the use case for the optimization of the optomechanical interface,...

Optical fibre precision positioning at cryogenic conditions

Single photon detectors are an important optical sensing tool in many industries. However, these highly efficient detectors suffer from variations in the size of an optical cavity when cooling down to 3K. An active positioning system is therefore required to correct the relative position of the fibre to the detector, so an optimal and...

Time-of-flight measurements of single-layer tissue with a chip-based optical frequency comb

Cerebral oxygen saturation is an important indicator that reflects the oxygen metabolism of the brain tissues in such patients. The utilization of near-infrared spectroscopy (NIRS) enables the identification of the oxygen saturation levels in nearby tissues by analyzing the distinct oxygenation states of hemoglobin-oxyhemoglobin (HbO2) and the...

Finite Element Simulation of Light and Correlation Propagation in Tissue: A finite element model simulation of diffuse optics in static and dynamic conditions

The investigation of the interaction between lasers and brain tissue holds significant theoretical and practical significance in the field of brain physiology studies. A two-dimensional finite element-based simulation model was constructed using the commercial finite element simulation software COMSOL Multiphysics to investigate the propagation...

Optimized Self-Centering Lens Mounting Technique for Precision Optomechanical Mounts in Supercontinuum Generation

This work delves into designing and implementing an optimized self-centering lens mounting technique for the collimator and coupler lenses in the Universal Light Source (ULS) by ASML. The ULS aims to meet the growing demand for smaller logic nodes and higher throughput in optical metrology sensors. To achieve precise alignment and stability, the...

Measurement Uncertainty Analysis of a Twyman-Green Interferometer for Lens Testing

There is a growing demand for precision and high-quality optical objectives and lenses due to their numerous advantages and uses. The market for high precision objective lenses has tremendous potential for development and is a sector that is expanding quickly. <br/><br/>Measuring the aberrations of optical systems is an essential step in the...

Visualisation of ultrasound waves in air to support acoustic levitation

Acoustic levitation is an novel method that could lend itself very useful to fast and precise transportation of small objects. To verify the acoustic field and the modelling assumptions, the acoustic field must be visualised and quantified. Different methods to visualise a pressure gradient are investigated and rated against design requirements....

Shape correction for 3D laser marking

inPhocal, a startup company specialized in laser marking, developed a novel optical module to make the depth of focus more than 50mm, and wants to replace ink marking by this laser marking system in the production line when marking information on products. Distortion will always happen when marking 2D patterns onto 3D objects with laser, so...

Stage inaccuracy compensation on sub-micrometer flatness measurement

Flatness is an important surface tolerance requirement during the manufacturing of a part of an ASML machine. Flatness can be measured by either measuring the variation in height of the surface in one measurement (a plane-wise measurement) or by measuring the height on multiple xy-coordinates on this surface (point-wise measurement). Point-wise...

Absolute distance interferometry for wafer-stage applications

Future industrial lithography machines will use interferometers for wafer-stage position metrology. Interferometers suffer from phase wrapping, which is why in this thesis an absolute phase detection system has been developed. The absolute phase detection system will use two lasers, with the second laser allowing for limited changes in the...

Three-dimensional ultrasound: Enabling volume measurements with a two-dimensional ultrasound probe

This work investigates low-cost three-dimensional (3D) ultrasound reconstruction from a two-dimensional (2D) hand-held probe with motion tracking. The best available motion tracking is an optical tracking system, which is expensive and requires external tracking hardware. Here, a low-cost manoeuvrable motion tracker, an inertial measurement unit...

Interferometric scattering of light by an ensemble of flowing spherical particles: Extracting a heartbeat from a pulsatile flow

Due to the increasing problem of cardiovascular diseases, the demand for diagnosing measurements is also increasing. These measurements should be cheap, nondestructive, accurate and real-time. Measurements like these already exist in the form of photoplethysmography (PPG). However, these measurements make use of a scalar quantity which throws...

Designing interactive demonstrations of optics phenomena

The United Nations and Unesco have declared 2015 to be the international year of light. The Optics department of the faculty of Applied Physics from the TU Delft has decided to contribute to this effort by designing optics experiments to be displayed at the Science Center Delft. The goal of this project was to manage first year students that...

Towards a trace gas detection setup using a VIPA spectrometer

To summarize, the work we have presented includes a revision of the theory and characteristics of the frequency comb laser, the molecular spectrum, the absorption enhancement with cavities and the VIPA spectrometer. Using this information, we have calculated the expected parameters of our multipass cell and the VIPA spectrometer. Employing a...