Numerical modelling for retrieval of the coating thickness variations from wavefront errors measurements.
Optics Express
|October 20, 2023
Summary
Thickness variations in multilayer coatings cause optical performance issues. This study introduces a model using wavefront error measurements to predict these variations and calculate optical properties across large components.
Area of Science:
- Optical engineering
- Materials science
- Thin film technology
Background:
- Multilayer coatings are crucial for large optical components.
- Thickness non-uniformities lead to spatial and chromatic variations in optical properties.
- Predicting optical performance is challenging without knowing thickness variations.
Purpose of the Study:
- To develop a model for retrieving thickness variations in multilayer coatings.
- To enable accurate prediction of optical properties over the component's aperture.
- To link wavefront error measurements to coating thickness non-uniformities.
Main Methods:
- Utilized wavefront error measurements as input.
- Developed a computational model to infer thickness variations.
- Validated the model's ability to predict optical properties.
Main Results:
- Successfully retrieved thickness variations from wavefront data.
- Demonstrated the model's capability to compute reflectance, transmittance, and wavefront errors.
- Showcased the ability to predict optical properties at various wavelengths, angles, and polarizations.
Conclusions:
- The developed model accurately retrieves multilayer coating thickness non-uniformities.
- This enables precise prediction of optical performance for large optical components.
- The method provides a powerful tool for optical designers and manufacturers.
Related Concept Videos
01:15Distance Corrections
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
01:30Typical Model Studies
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
01:26Area Problem
Determining the area of a region with straight edges is straightforward, as geometric formulas for rectangles, triangles, and polygons can be applied directly. However, traditional geometric methods are insufficient when a region has a curved boundary, such as the area under a function.fromThe area problem involves finding a systematic way to measure such regions. One approach to solving this problem is through approximation. Instead of attempting to compute the area exactly at the outset, the...